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Dynamic fracture and reaction coupling mechanism in plasticity-enhanced Al/Ni reactive materials under high overload 认领 引用
1
作者 Zhe Liu Weibing Li +5 位作者 Junbao Li Huiming Shen Kun Zhang Jiaxin Yu Yuxin Zheng Xianghao Bai 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第8期216-229,共14页
This study investigates the coupling mechanism between fracture damage evolution and impact energy release in reactive materials under high overload conditions.To this end,a plasticity-enhanced Al/Ni reactive material... This study investigates the coupling mechanism between fracture damage evolution and impact energy release in reactive materials under high overload conditions.To this end,a plasticity-enhanced Al/Ni reactive material was developed via hot pressing.The mechanical response of the material at varying temperatures and strain rates was characterized using dynamic and static compression testing,enabling calibration of its Johnson-Cook(JC)constitutive parameters.Combining the chemical reaction kinetics,a user-defined material subroutine(UMAT)based on the JC model was developed to simulate the coupled fracture-reaction process of the Al/Ni material under high-impact loading,with experimental validation of the model predictions.Experimental results indicate that at a strain rate of 10−3 s−1,the fracture true strain of the material is 28%higher than that of conventional Al/Ni composites.The stress-strain curves obtained from split Hopkinson pressure bar(SHPB)tests exhibit an error margin within 10%when compared to numerical simulations.Under detonation loading,the fracture mode predicted by numerical simulation agrees well with experimental observations,with crack initiation occurring in the localized damage zone at the specimen mid-section in both cases.Furthermore,the simulated fragment size distribution and fracture surface morphology closely match those observed experimentally.Integrative analysis reveals the fracture-reaction coupling mechanism governing the dynamic failure of plasticity-enhanced Al/Ni composites under high-strain-rate impact loading. 展开更多
关键词 Plasticity-enhanced Al/Ni reactive materials Mechanical properties Johnson-Cook constitutive model User-defined subroutine Coupling effect between fracture and reaction
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Effects of Structural Characteristics of a Bionic Dragonfly Wing on Its Low Velocity Impact Resistance 认领 引用 被引量：3
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作者 Azadeh Arjangpay Abolfazl Darvizeh Mehdi Yarmohammad Tooski 《Journal of Bionic Engineering》 SCIE EI CSCD 2018年第5期859-871,共13页
The influence of the structural features of dragonfly wings, including the sandwich-type configuration of longitudinal veins and the longitudinal corrugations, on the impact response of a bio-inspired structure is inv... The influence of the structural features of dragonfly wings, including the sandwich-type configuration of longitudinal veins and the longitudinal corrugations, on the impact response of a bio-inspired structure is investigated. According to experimental observations of the wing morphology, a novel foam-based composite structure is introduced consisting of E-glass/epoxy face-sheets bonded to a polyurethane foam core. A finite element model is employed to simulate the structural responses of the biomimetic structure under low velocity impact. The initiation and evolution of the impact-induced damage in composite skins are simulated by applying a user-defined progressive damage model together with the interracial cohesive law for intra- and inter-laminar damages, respectively. To simulate the nonlinear behavior of the foam core, a crushable plasticity model is implemented. The numerically obtained results are found to correlate with the experimentally measured ones, acquired by drop-weight testing on a bio-inspired structure. It is numerically predicted that reinforcing the structure with the veins gives the more impact load-bearing capacity and the longitudinal corrugation can increase the stiffness and damage resistance of the structure. Effects of the change in impact location, the configuration of the veins and the corrugated angle on damage resistance of the structures are fully discussed. 展开更多
关键词 dragonfly wing bio-inspired structure impact response progressive damage Vectorized User-defined Material subroutine
Finite element modeling of pavement responses based on stress-dependent properties of asphalt layer 认领 引用
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作者 董尼娅 李昶 倪富健 《Journal of Southeast University(English Edition)》 EI CAS 2015年第3期401-406,共6页
In order to investigate the stress-dependent properties of hot-mix asphalt （HMA）,a dynamic modulus test was conducted on a group of AC-20 specimens at various stress states and loading frequencies,respectively.A use... In order to investigate the stress-dependent properties of hot-mix asphalt （HMA）,a dynamic modulus test was conducted on a group of AC-20 specimens at various stress states and loading frequencies,respectively.A user-defined material （UMAT ）subroutine incorporating stress-dependent constitutive model was developed and finite element （FE）simulation was utilized to confirm the validity of the UMAT.A three-dimensional （3D ）FE model for typical pavement structure was established,considering the HMA layer as a stress-dependent material and other layers as linear elastic materials.Periodic load was applied to the pavement model and the pavement responses were calculated,including dynamic modulus distributions,surface deflection,shear stress and tensile strain in the HMA layer,etc.Both test results and FE model predictions indicate that the dynamic modulus of asphalt concrete is sensitive to stress state and loading frequency.Using the nonlinear stress-dependent model results in greater predicted pavement responses compared with the linear elastic model.It is also found that the effects of stress-dependency on pavement responses become more significant as loading frequency decreases. 展开更多
关键词 dynamic modulus test loading frequency stress-dependent model user-defined material （UMAT）subroutine pavement responses
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