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Experimental study on damage characteristics of t-shaped stiffened plates subjected to different types of shaped charges:Linear-shaped charge,embowed linear-shaped charge,and embowed linear explosively formed projectile 认领 引用
1
作者 Shenhe Zhang Zhifan Zhang +4 位作者 Shuxin Yang Longkan Wang Yutong Sui Guiyong Zhang Zhi Zong 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第2期231-243,共13页
In order to investigate the penetration performance of Linear-Shaped Charge(LSC),Embowed LinearShaped Charge(ELSC),and Embowed Linear Explosively Formed Projectile(ELEFP)on T-shaped stiffened plates,a series of near-f... In order to investigate the penetration performance of Linear-Shaped Charge(LSC),Embowed LinearShaped Charge(ELSC),and Embowed Linear Explosively Formed Projectile(ELEFP)on T-shaped stiffened plates,a series of near-field air-burst experiments are conducted.The damage modes and characteristics of the target plates are compared and analyzed.Each flat plate section is completely punctured,resulting in a penetration hole.The damage modes induced by the three charge types on the stiffened plate structure are consistent,characterized by shear failure in the central region of the flat plate due to penetration by the penetrator,localized plastic deformation of the flat plate,and local penetration failure resulting from partial perforation of the central stiffener.The penetration lengths caused by ELSC and ELEFP are 45.1%and 46.1% larger than that of LSC,while the half-width of the penetration hole generated by ELEFP is 54.2% and 24.7% smaller than that of ELSC and LSC,respectively.The penetration height caused by ELEFP are 17.5%and 62.1% larger than that of ELSC and LSC,respectively.The stiffener effectively segments the damage area,enhancing the local structural strength and limiting the extent of plastic deformation in the flat plate section.The comparative results show that the ELSC proves to be more effective for efficient large-scale damage,and ELEFP is more suitable for achieving efficient localized damage. 展开更多
关键词 Linear-shaped charge Embowed linear-shaped charge Embowed linear explosively formed projectile Near-filed explosion Penetration performance Stiffened plate
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ESL-Based MMC Topology Optimization of Thin-Walled Stiffened Structures Under Transient Impact Loading 认领 引用
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作者 Zizhen Guo Gang Chen +2 位作者 Ang Li Xue Bai Weisheng Zhang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第5期635-653,共19页
This paper presents an explicit topology optimization method based on the equivalent static load(ESL)method for nonlinear topology optimization of thin-walled stiffened structures under impact loading.This method defi... This paper presents an explicit topology optimization method based on the equivalent static load(ESL)method for nonlinear topology optimization of thin-walled stiffened structures under impact loading.This method defines stiffeners as moving morphable components within a Lagrangian geometric framework.By parametrizing geometric characteristics(including reinforcement positions,profiles,and sizes),it enables simultaneous optimization of both topology configurations and geometric layouts.For nonlinear dynamic optimization under impact loads,the ESL method is integrated into the explicit topology optimization framework.Through load equivalence transformation strategy,the complex nonlinear dynamic optimization problem is converted into a series of linear static subproblems,which significantly reduces computational complexity for the design of thin-walled stiffened structures under nonlinear conditions.The proposed method yields optimized design with guaranteed structural dynamic performance with enhanced optimization efficiency.Several numerical examples are presented to demonstrate its effectiveness and engineering applicability. 展开更多
关键词 Thin-walled stiffened structures Impact loading Nonlinear topology optimization Moving morphable component(MMC) Equivalent static load(ESL)
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A fast equivalent-isotropic-plate model for the symmetrically stiffened plate under pulse loading 认领 引用
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作者 Chongxi Jiao Mu Wang Xinming Qiu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期477-489,共13页
In engineering,a reasonable and efficient method to simplify the large-scale calculation of dynamic response of stiffened plates is highly desired.This paper proposes a novel equivalent-isotropic-plate model(EIPM)to c... In engineering,a reasonable and efficient method to simplify the large-scale calculation of dynamic response of stiffened plates is highly desired.This paper proposes a novel equivalent-isotropic-plate model(EIPM)to convert a symmetrically stiffened plate to an isotropic flat plate within elasticity.EIPM provides concise and explicit formulas to calculate the equivalent plate thickness,which can save a lot of computational resources compared with direct simulation or solving complex differential equations.Under uniformly distributed impulse loading,EIPM performs excellently in predicting the maximum deflection response with an error of no more than 10%.The stiffened and the equivalent plates have similar vibration modes,but the former has a vibration frequency slightly higher than the latter by about 17%at maximum.After verification,EIPM is suitable for various complex stiffening forms with independence of materials and loads,and even qualified for large deformation problems.Due to its accuracy,efficiency,and applicability,the EIPM has potential applications in structural optimization and fast prediction of dynamic response. 展开更多
关键词 Equivalent plate model Symmetrically stiffened plate Isotropic equivalence Dynamic response Pulse loading
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Equivalent Design Methodology for Ship-Stiffened Steel Plates under Ogival-Nosed Projectile Penetration 认领 引用 被引量：1
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作者 Yezhi Qin Qinglin Chen +1 位作者 Ying Wang Yingqiang Cai 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第8期1883-1906,共24页
The penetration of ogival-nosed projectiles into ship plates represents a complex impact dynamics issue essential for analyzing structural failuremechanisms.Although stiffenedplates are vital in ship construction,fews... The penetration of ogival-nosed projectiles into ship plates represents a complex impact dynamics issue essential for analyzing structural failuremechanisms.Although stiffenedplates are vital in ship construction,fewstudies have addressed the issue of model equivalence under penetration loading.This study employs numerical simulation to validate an experiment with an ogival-nosed projectile penetrating a Q345 steel plate.Four equivalent stiffened plate methods are proposed based on the area,flexural modulus,moment of inertia,and thickness.The results indicate that thickness equivalence(DM4)is unsuitable for penetration-loaded stiffened plates,except under low-speed,nonpenetrating through impacts,and yields less accuracy than DM1/DM3.DM1,DM2,and DM3 each perform optimally with specific velocity ranges:DM1 at very low(critical)and high velocities,DM3 at low velocities,and DM2 at high speeds.Furthermore,in penetration scenarios,T-shaped stiffeners can be replacedwith rectangular ones,as both exhibit similar failure behaviors and deflection trends,simplifying the design while preserving key structural characteristics.These findings provide valuable insights into the design of protective ship structures. 展开更多
关键词 Ogival-nosed projectile stiffened plate equivalent model design penetration
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Research on the Ultimate Strength of a Hull Bottom Full-Scale Stiffened Plate Under Axial Compression and Lateral Pressure 认领 引用 被引量：1
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作者 LI Zheng-jie DING Qi-yin +1 位作者 CUI Hu-wei ZHAO Nan 《China Ocean Engineering》 SCIE EI CSCD 2025年第1期1-12,共12页
The influences of different factors,including whether the transverse frames are actually built,longitudinal and transverse welding residual stresses,and unloaded edge boundaries,on the ultimate strength and failure mo... The influences of different factors,including whether the transverse frames are actually built,longitudinal and transverse welding residual stresses,and unloaded edge boundaries,on the ultimate strength and failure mode of a real hull bottom full-scale stiffened plate under axial compression and lateral pressure are investigated via numerical analysis.Result shows that the failure mode of the stiffened plate under axial compression is the tripping of the stiffeners.Whether transverse frames are built has little effect on the ultimate strength of the stiffened plate under axial compression,which can be replaced by the degree of freedom constraint.However,when lateral pressure is present,the transverse frame cannot be simply replaced by a free-degree constraint.The longitudinal residual stress has a greater effect on the ultimate strength,whereas the effect of the transverse residual stress is smaller.Stronger unloaded edge boundary conditions can slightly enhance the stiffness and ultimate strength of the stiffened plate.Under combined axial compression and lateral pressure,the failure mode of stiffened plates changes from the tripping of stiffeners to beam-column failure,as the lateral pressure increases.The ability of stiffened plates in which transverse frames are actually built out to resist beam-column shape deformation becomes weaker with lower ultimate strength.Stronger unloaded edge boundary conditions can improve the ability of stiffened plates to resist beam-column deformation and increase the ultimate strength. 展开更多
关键词 ultimate strength full-scale stiffened plate residual stress lateral pressure
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Review on integral stiffened panel of aircraft fuselage structure 认领 引用 被引量：2
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作者 Devi Chandra Y.Nukman +2 位作者 Muhammad Adlan Azka S.M.Sapuan J.Yusuf 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第4期1-11,共11页
The increasing demand to decrease manufacturing costs and weight reduction is driving the aircraft industry to change the use of conventional riveted stiffened panels to integral stiffened panels(ISP)for aircraft fuse... The increasing demand to decrease manufacturing costs and weight reduction is driving the aircraft industry to change the use of conventional riveted stiffened panels to integral stiffened panels(ISP)for aircraft fuselage structures.ISP is a relatively new structure in aircraft industries and is considered the most significant development in a decade.These structures have the potential to replace the conventional stiffened panel due to the emergence of manufacturing technology,including welding,high-speed machining(HSM),extruding,and bonding.Although laser beam welding(LBW)and friction stir welding(FSW)have been applied in aircraft companies,many investigations into ISP continue to be conducted.In this review article,the current state of understanding and advancement of ISP structure is addressed.A particular explanation has been given to(a)buckling performance,(b)fatigue performance of the ISP,(c)modeling and simulation aspects,and(d)the impact of manufacturing decisions in welding processes on the final structural behavior of the ISP during service.Compared to riveted panels,machined ISP had a better compressive buckling load,and FSW integral panels had a lower buckling load than riveted panels.Compressive residual stress decreased the stress intensity factor(SIF)rates,slowing down the growth of fatigue cracks as occurred in FSW and LBW ISP. 展开更多
关键词 Integral stiffened panel Buckling Fatigue Friction stir welding Laser beam welding
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Fatigue Assessment of Large-Diameter Stiffened Tubular Welded Joints Using Effective Notch Strain and Structural Strain Approach 认领 引用
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作者 Dan Jiao Yan Dong +3 位作者 Hao Xie Yordan Garbatov Jiancheng Liu Hui Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第12期3197-3216,共20页
Floating offshore wind turbine platforms typically use stiffened tubular joints at the connections between columns and braces.These joints are prone to fatigue due to complex weld geometries and the additional stress ... Floating offshore wind turbine platforms typically use stiffened tubular joints at the connections between columns and braces.These joints are prone to fatigue due to complex weld geometries and the additional stress concentrations caused by the stiffeners.Existing hot-spot stress approaches may be inadequate for analysing these joints because they do not simultaneously address weld-toe and weld-root failures.To address these limitations,this study evaluates the fatigue strength of stiffened tubular joints using the effective notch strain approach and the structural strain approach.Both methods account for fatigue at the weld toe and weld root and can be applied to both low-cycle fatigue(LCF)and high-cycle fatigue(HCF)regimes.Reanalyzes of a series of fatigue-tested specimens confirm the effectiveness of both approaches.The stiffener-shell fillet weld root is identified as the most critical fatigue location,which is consistent with fractographic observations.Although the brace-to-shell weld root exhibits lower stress levels in finite element(FE)models,weld quality was determined to be a crucial factor in fatigue failure.Furthermore,the results emphasise the importance of material plasticity in the LCF regime and demonstrate that full weld penetration significantly enhances fatigue strength.These findings provide valuable insights for the fatigue design of stiffened tubular joints in floating offshore wind turbine platforms. 展开更多
关键词 Stiffened tubular joints weld root effective notch strain structural strain finite element analysis
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Effect of Material and Geometric Defects on Buckling Resistance of Stiffened Panels 认领 引用
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作者 Ikram Feddal Houcine Zniker +2 位作者 Hicham Mezouara Zakia Ngadi Mohamed Khalil El Kouifat 《Journal of Harbin Institute of Technology(New Series)》 CAS 2025年第4期72-81,共10页
The buckling behavior of stiffened panels is significantly influenced by material and geometric defects,making it a critical factor in ensuring structural integrity and safety.These panels are widely used in mechanica... The buckling behavior of stiffened panels is significantly influenced by material and geometric defects,making it a critical factor in ensuring structural integrity and safety.These panels are widely used in mechanical,aerospace,marine,and civil engineering applications due to their ability to enhance bending stiffness with minimal additional weight.Under high loads or stress concentrations,localized structural failures can initiate global buckling in stiffened panels.This study investigates how such defects affect the critical buckling load,stiffness,and thickness of stiffened panels.Two finite element analyses were conducted:a linear analysis to identify the initial buckling mode and a nonlinear analysis using the Riks algorithm in Abaqus CAE,incorporating localized imperfections.The simulations show that material and geometric defects can reduce buckling resistance depending on their severity. 展开更多
关键词 Finite Element Method(FEM) buckling Friction Stir Welding(FSW) stiffened panels Abaqus CAE imperfections
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Optimum design of hierarchical stiffened shells for low imperfection sensitivity 认领 引用 被引量：14
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作者 Bo Wang Peng Hao +5 位作者 Gang Li Jia-Xin Zhang Kai-Fan Du Kuo Tian Xiao-Jun Wang Xiao-Han Tang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2014年第3期391-402,共12页
A concept of hierarchical stiffened shell is proposed in this study, aiming at reducing the imperfection sen- sitivity without adding additional weight. Hierarchical stiffened shell is composed of major stiffeners and... A concept of hierarchical stiffened shell is proposed in this study, aiming at reducing the imperfection sen- sitivity without adding additional weight. Hierarchical stiffened shell is composed of major stiffeners and minor stiff- eners, and the minor stiffeners are generally distributed between adjacent major stiffeners. For various types of geo- metric imperfections, e.g., eigenmode-shape imperfections, hierarchical stiffened shell shows significantly low imper- fection sensitivity compared to traditional stiffened shell. Furthermore, a surrogate-based optimization framework is proposed to search for the hierarchical optimum design. Then, two optimum designs based on two different opti- mization objectives （including the critical buckling load and the weighted sum of collapse loads of geometrically imperfect shells with small- and large-amplitude imperfections） are compared and discussed in detail. The illustrative example demonstrates the inherent superiority of hierarchical stiffened shells in resisting imperfections and the effectiveness of the proposed framework. Moreover, the decrease of imperfection sensitivity can finally be converted into a decrease of structural weight, which is particularly important in the development of large-diameter launch vehicles. 展开更多
关键词 Hierarchical stiffened shell Imperfection sensi-tivity Collapse Optimization
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Three-dimensional Cure Simulation of Stiffened Thermosetting Composite Panels 认领 引用 被引量：13
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作者 Guangquan Yue Boming Zhang +1 位作者 Fuhong Dai Shanyi Du 《Journal of Materials Science & Technology》 SCIE EI CAS 2010年第5期467-471,共5页
Stiffened thermosetting composite panels were fabricated with co-curing processing.In the co-curing processing,the temperature distribution in the composite panels was nonuniform.An investigation into the threedimensi... Stiffened thermosetting composite panels were fabricated with co-curing processing.In the co-curing processing,the temperature distribution in the composite panels was nonuniform.An investigation into the threedimensional cure simulation of T-shape stiffened thermosetting composite panels was presented.Flexible tools and locating tools were considered in the cure simulation.Temperature distribution in the composites was predicted as a function of the autoclave temperature history.A nonlinear transient heat transfer finite element model was developed to simulate the curing process of stiffened thermosetting composite panels.And a simulation example was presented to demonstrate the use of the present finite element procedure for analyzing composite curing process.The glass/polyester structure was investigated to provide insight into the nonuniform cure process and the effect of flexible tools and locating tools on temperature distribution.Temperature gradient in the intersection between the skin and the flange was shown to be strongly dependent on the structure of the flexible tools and the thickness of the skin. 展开更多
关键词 Thermosetting composite Stiffened panels Co-curing Numerical simulation
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Fatigue behavior of aluminum stiffened plate subjected to random vibration loading 认领 引用 被引量：8
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作者 胡海涛 李玉龙 +4 位作者 索涛 赵峰 苗应刚 薛璞 邓琼 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第5期1331-1336,共6页
Vibration tests were carried out on three types of stiffened aluminum plates with fully clamped boundaries under random base excitation. During the test, the response of the specimens was monitored using strain gauges... Vibration tests were carried out on three types of stiffened aluminum plates with fully clamped boundaries under random base excitation. During the test, the response of the specimens was monitored using strain gauges. Based on the strain history, the accumulation of fatigue damage of the stiffened plates was estimated by means of the rainflow cycle counting technique and the Miner linear damage accumulation model in the time domain. Utilizing the change of natural frequencies, a nonlinear model was fitted for predicting the fatigue damage of plate and then the foregone failure criterion of 5% reduction in natural frequency is improved. The influence of section and spacing of the stiffeners on the vibration fatigue behavior of the aluminum plate was investigated. The results show that the fatigue life of aluminum plate increases with adding either T or L section riveted stiffeners. With the same cross-sectional area of stiffener, the T section stiffened plate shows longer fatigue life than L section stiffened plate. Meanwhile, the vibration fatigue life also shows great sensitivity to the spacing between the stiffeners. 展开更多
关键词 stiffened plate vibration fatigue vibration test fatigue life natural frequency
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An Optimization Approach for Stiffener Layout of Composite Stiffened Panels Based on Moving Morphable Components(MMCs) 认领 引用 被引量：7
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作者 Zhi Sun Ronghua Cui +3 位作者 Tianchen Cui Chang Liu Shanshan Shi Xu Guo 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2020年第5期650-662,共13页
An explicit topology optimization method for the stiffener layout of composite stiffened panels is proposed based on moving morphable components(MMCs).The skin and stiffeners are considered as panels with different be... An explicit topology optimization method for the stiffener layout of composite stiffened panels is proposed based on moving morphable components(MMCs).The skin and stiffeners are considered as panels with different bending stiffnesses,with the use of equivalent stiffness method.Then the location and geometric properties of composite stiffeners are determined by several MMCs to perform topology optimization,which can greatly simplify the finite element model.With the objective of maximizing structural stiffness,several typical cases with various loading and boundary conditions are selected as numerical examples to demonstrate the proposed method.The numerical examples illustrate that the proposed method can provide clear stiffener layout and explicit geometry information,which is not limited within the framework of parameter and size optimization.The mechanical properties of composite stiffened panels can be fully enhanced. 展开更多
关键词 Topology optimization Composite stiffened panels Stiffener layout Moving morphable components(MMCs)
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Bandgap formation and low-frequency structural vibration suppression for stiffened plate-type metastructure with general boundary conditions 认领 引用 被引量：4
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作者 Tian ZHAO Zhichun YANG +1 位作者 Yanlong XU Wei TIAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第10期210-228,共19页
Metastructures with unique mechanical properties have shown attractive potential application in vibration and noise reduction.Typically,most of the metastructures deal with the vibration bandgap properties of infinite... Metastructures with unique mechanical properties have shown attractive potential application in vibration and noise reduction.Typically,most of the metastructures deal with the vibration bandgap properties of infinite structures without considering specific boundary condition and dynamic behaviors,which cannot be directly applied to the engineering structures.In this research,we design a Stiffened Plate-type Metastructure(SPM)composed of a plate with periodic stiffeners and cantilever beam-type resonators subjected to general boundary conditions for low-frequency vibration suppression.The effects of boundary conditions and the number and orientation of the stiffeners on Locally Resonant(LR)type bandgap properties in SPM are further investigated.An analytical modeling framework is developed to predict the bandgap formations and vibration behaviors of SPMs in finite-size configuration.The governing equations of the SPM reinforced by various arrangements of stiffeners are derived based on the first-order shear deformation theory and Hamilton’s principle,and a Fourier series combined with auxiliary functions is employed to satisfy the arbitrary boundary conditions.Finite element analysis and experimental investigations of vibration behaviors for the SPM are carried out to validate the accuracy and reliability of the present analytical model.For practical designs of the SPMs with specific boundary conditions,it is found that there exist optimal numbers of stiffeners and resonators which can produce the significant LR-type bandgap behaviors.Furthermore,various arrangements of stiffeners and resonators are explored for different boundary conditions by breaking the requirement of spatially periodicity.It is shown that for the designed SPM,the vibration modes of its host structure should be considered to widen the frequency range in which the resonators transfer and store energy,and hence improve the performance of low-frequency vibration suppression.The present work can provide a significant theoretical guidance for the engineering application of metamaterial stiffened structures。 展开更多
关键词 Bandgap Locally resonant Metastructure Stiffened plate Vibration suppression
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Residual Strength of Stiffened LY12CZ Aluminum Alloy Panels with Widespread Fatigue Damage 认领 引用 被引量：4
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作者 李仲 葛森 +2 位作者 吕国志 陈莉 丁惠良 《Chinese Journal of Aeronautics》 SCIE EI CAS 2008年第1期48-52,共5页
Experimental and analytical investigations on the residual strength of the stiffened LY12CZ aluminum alloy panels with widespread fatigue damage （WFD） are conducted. Nine stiffened LY12CZ aluminum alloy panels with ... Experimental and analytical investigations on the residual strength of the stiffened LY12CZ aluminum alloy panels with widespread fatigue damage （WFD） are conducted. Nine stiffened LY12CZ aluminum alloy panels with three different types of damage are tested for residual strength. Each specimen is pre-cracked at rivet holes by saw cuts and subjected to a monotonically increasing tensile load until failure is occurred and the failure load is recorded. The stress intensity factors at the tips of the lead crack and the adjacent WFD cracks of the stiffened aluminum alloy panels are calculated by compounding approach and finite element method （FEM） respectively. The residual strength of the stiffened panels with WFD is evaluated by the engineering method with plastic zone linkup criterion and the FEM with apparent fracture toughness criterion respectively. The predicted residual strength agrees well with the experiment results. It indicates that in engineering practice these methods can be used for residual strength evaluation with the acceptable accuracy. It can be seen from this research that WFD can significantly reduce the residual strength and the critical crack length of the stiffened panels with WFD. The effect of WFD crack length on residual strength is also studied. 展开更多
关键词 stiffened panel widespread fatigue damage （WFD） residual strength stress intensity factor plastic zone linkup criterion
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Vibration and Acoustic Radiation from Orthogonally Stiffened Infinite Circular Cylindrical Shells in Water 认领 引用 被引量：7
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作者 陈军明 黄玉盈 曾革委 《China Ocean Engineering》 SCIE EI 2002年第4期437-452,共16页
Based on the motion differential equations of vibration and acoustic coupling system for thin elastic shells with ribs, by means of the Fourier integral transformation and the Fourier inverse transformation, as well a... Based on the motion differential equations of vibration and acoustic coupling system for thin elastic shells with ribs, by means of the Fourier integral transformation and the Fourier inverse transformation, as well as the stationary phase method, an analytic solution, which has satisfying computational effectiveness and precision, is derived for the solution to the vibration and acoustic radiation from a submerged stiffened infinite circular cylinder with both ring and axial ribs. It is easy to analyze the effect of stiffening supports in the acoustic radiation field by use of the formulas obtained by the presented method and corresponding numerical computation. It is shown that the axial-stiffeners can improve the mechanical and acoustical characteristics. Moreover, the present method can be used to study the acoustic radiation mechanism of the type of structure. 展开更多
关键词 coupling system stiffened cylindrical shell vibration and acoustic radiation analytic solution acoustic radiation mechanism
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Explicit Topology Optimization Design of Stiffened Plate Structures Based on the Moving Morphable Component(MMC)Method 认领 引用 被引量：3
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作者 Xudong Jiang Chang Liu +5 位作者 Shaohui Zhang Weisheng Zhang ZongliangDu Xiaoyu Zhang Huizhong Zeng Xu Guo 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第5期809-838,共30页
This paper proposes an explicit method for topology optimization of stiffened plate structures.The present work is devoted to simultaneously optimizing stiffeners’shape,size and layout by seeking the optimal geometry... This paper proposes an explicit method for topology optimization of stiffened plate structures.The present work is devoted to simultaneously optimizing stiffeners’shape,size and layout by seeking the optimal geometry parameters of a series of moving morphable components(MMC).The stiffeners with straight skeletons and the stiffeners with curved skeletons are considered to enhance the modeling and optimization capability of the current approach.All the stiffeners are represented under the Lagrangian-description framework in a fully explicit way,and the adaptive ground structure method,as well as dynamically updated plate/shell elements,is used to obtain optimized designs with more accurate analysis results.Compared with existing works,the proposed approach provides an explicit description of the structure.Thus,a stiffened plate structure with clear stiffener distribution and smooth geometric boundary can be obtained.Several numerical examples provided,including straight and curved stiffeners,hierarchical stiffeners,and a stiffened plate with a cutout,validate the effectiveness and applicability of the proposed approach. 展开更多
关键词 Topology optimization stiffened plate structures moving morphable component(MMC) straight/curved skeletons
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Field testing of stiffened deep cement mixing piles under lateral cyclic loading 认领 引用 被引量：12
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作者 Werasak Raongjant Meng Jing 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2013年第2期261-265,共5页
Construction of seaside and underground wall bracing often uses stiffened deep cement mixed columns （SDCM）. This research investigates methods used to improve the level of bearing capacity of these SDCM when subject... Construction of seaside and underground wall bracing often uses stiffened deep cement mixed columns （SDCM）. This research investigates methods used to improve the level of bearing capacity of these SDCM when subjected to cyclic lateral loading via various types of stiffer cores. Eight piles, two deep cement mixed piles and six stiffened deep cement mixing piles with three different types of cores, H shape cross section prestressed concrete, steel pipe, and H-beam steel, were embedded though soft clay into medium-hard clay on site in Thailand. Cyclic horizontal loading was gradually applied until pile failure and the hysteresis loops of lateral load vs. lateral deformation were recorded. The lateral carrying capacities of the SDCM piles with an H-beam steel core increased by 3-4 times that of the DCM piles. This field research clearly shows that using H-beam steel as a stiffer core for SDCM piles is the best method to improve its lateral carrying capacity, ductility and energy dissipation capacity. 展开更多
关键词 stiffened deep cement mixing pile lateral capacity cyclic lateral loading energy dissipation capacity field testing
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Guided wave propagation analysis in stiffened panel using time-domain spectral finite element method 认领 引用 被引量：3
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作者 Zexing YU Chao XU +1 位作者 Jiaying SUN Fei DU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第10期208-221,共14页
Stiffened panels have been widely utilized in fuselages and wings as critical load-bearing components. These structures are prone to be damaged under long-term and extreme loads, and their health monitoring has been a... Stiffened panels have been widely utilized in fuselages and wings as critical load-bearing components. These structures are prone to be damaged under long-term and extreme loads, and their health monitoring has been a common concern. The guided wave-based monitoring method is regarded as an efficient approach to detect the damage in stiffened plates because of its wide monitoring range and high sensitivity to micro-damage. Efficient simulation of wave propagation can theoretically demonstrate the detection mechanism of the method. In this study, a Time-Domain Spectral Finite Element Method(TD-SFEM) is adopted to study the wavefield in stiffened plates,where continuous Absorbing Layers with Increasing Damping(ALID) strategy is proposed to circumvent the disturbance of reflected waves on boundaries. After the convergence analysis, the developed TD-SFEM with ALID is validated by the finite element method first. Then, wave scattering and the influence of the stiffener are investigated in detail by comparing the results with the non-stiffened structure. Finally, the effects of the parameters of the stiffener, such as the height and width, on wave propagation are studied, respectively. The results illustrate that the proposed TDSFEM with ALID is an efficient approach to study the wave propagation in the stiffened plate and can reveal the mechanism of influence of the stiffener. It is found that the height of the stiffener changes the interference of wavefield in the plate, while the effects of the width are mainly in wave scattering and mode conversion. 展开更多
关键词 Absorbing layers with increasing damping Guided waves Stiffened Panel Time-domain spectral finite element Wave propagation
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Set-based parametric modeling, buckling and ultimate strength estimation of stiffened ship structures 认领 引用 被引量：2
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作者 LI Yi-bo PAN Qing +1 位作者 HUANG Ming-hui LI Lu 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第7期1958-1975,共18页
There have been a great demand for a suitable and convenient method in the field of buckling analysis of stiffened ship structures, which is essential to structural safety assessment and is significantly time-consumin... There have been a great demand for a suitable and convenient method in the field of buckling analysis of stiffened ship structures, which is essential to structural safety assessment and is significantly time-consuming. Modeling, buckling behaviors and ultimate strength prediction of stiffened panels were investigated. The modeling specification including nonlinear finite element model and imperfections generation, and post-buckling analysis procedure of stiffened plates were demonstrated. And a software tool using set-based finite element method was developed and executed in the MSC. Marc environment. Different types of stiffen panels of marine structures have been employed to investigate the buckling behavior and assess the validity in the estimation of ultimate strength. A comparison between results of the generally accepted methods, experiments and the software tool developed was demonstrated. It is shown that the software tool can predict the ultimate capacity of stiffened panels with imperfections with a good accuracy. 展开更多
关键词 buckling ultimate strength stiffened plates parametric modeling ship structure
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Automated Layout Design of Stiffened Container Structures Based on the Morphology of Plant Ramifications 认领 引用 被引量：3
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作者 Baotong Li Suna Yan Qiyin Lin 《Journal of Bionic Engineering》 SCIE EI CSCD 2016年第2期344-354,共11页
This study proposes a new topology optimization solution providing designers with choices for feasible stiffener layouts inside large-scale containers of garbage trucks. Firstly, the mathematical expressions of loadin... This study proposes a new topology optimization solution providing designers with choices for feasible stiffener layouts inside large-scale containers of garbage trucks. Firstly, the mathematical expressions of loading conditions inside garbage containers are derived. Then, a growth-based layout optimization framework is built, taking inspiration from the morphology of plant ramifications. The principles of the highly effective but individual design rules of existent leaf venation layout problems are explored and transferred into analytical laws. Based on this, an evolutionary algorithm is developed to simulate the load-adapted growth of stiffener layouts, which provides an approximately homogeneous stress distribution along the surface of self-optimizing structures, Unlike the conventional methods, the new approach needs neither the densest ground structure nor the modification of the existing finite element programs, it is fast, easy to apply and nearly constraint free. Finally, a case study is provided showing how a large-scale container structure can be designed by this extremely intelligent CAD approach. 展开更多
关键词 automated layout design topology optimization bionic design evolutionary algorithm stiffened container
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