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Dynamic stress analysis of functionally gradient material subject to SH waves 认领 引用
1
作者 Qi Lu Zhenqing Wang +2 位作者 Yun Zhu Zailin Yang Yong Yang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2024年第10期24-40,共17页
In this paper, the wave propagation in functionally graded materials (FGM) is studied by the elastic wave theory based on thewave problems in homogeneous media. The auxiliary function and modulus function are introduc... In this paper, the wave propagation in functionally graded materials (FGM) is studied by the elastic wave theory based on thewave problems in homogeneous media. The auxiliary function and modulus function are introduced to construct the displacementfield and density function. The displacement field, modulus function, and density function are connected to proposea design theory of special FGM. An analytical method for elastic wave propagation in inhomogeneous media with varyingmodulus and density is derived to provide theoretical references for material design and dynamic stress analysis under elasticwaves. Taking the problem of dynamic stress concentration caused by shallow buried elliptical cavity in half space designedunder SH waves as an example, the calculation results are obtained and analyzed. The results show that the dynamic stressconcentration is sensitive to the change of the inhomogeneity of the medium. 展开更多
关键词 Functional gradient materials Elastic wave Modulus Density Dynamic stress concentration
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ASYMPTOTIC SOLUTIONS OF MODE I STEADY GROWTH CRACK IN MATERIALS UNDER CREEP CONDITIONS 认领 引用
2
作者 Qinghua Meng Zhenqing Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2015年第5期578-591,共14页
An asymptotic analysis is made on problems with a steady-state crack growth cou- pled with a creep law model under tensile loads. Asymptotic equations of crack tip fields in creep materials are derived and solved nume... An asymptotic analysis is made on problems with a steady-state crack growth cou- pled with a creep law model under tensile loads. Asymptotic equations of crack tip fields in creep materials are derived and solved numerically under small scale conditions. Stress and strain func- tions are adopted under a polar coordinate system. The governing equations of asymptotic fields are obtained by inserting the stress field and strain field into the material law. The crack growth rate rather than fracture criterion plays an important role in the crack tip fields of materials with creep behavior. 展开更多
关键词 asymptotic analysis steady-state growth small scale conditions creep materials
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Numerical simulation of loading edge cracks by edge impact using the extended finite element method 认领 引用
3
作者 Qinghua Meng Zhenqing Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2015年第2期156-167,共12页
The extended finite element method is used to analyze a plate with two parallel edge cracks impacted by a cylindrical projectile. The influence of the impact speed, crack length, plate thickness and notch tip radius o... The extended finite element method is used to analyze a plate with two parallel edge cracks impacted by a cylindrical projectile. The influence of the impact speed, crack length, plate thickness and notch tip radius on the crack initiation and propagation is studied. Dynamics equations are solved by an implicit time integration scheme which is unconditionally stable. Very good agreement is achieved between numerical predictions and experimental results. The critical velocity of the crack initiation under different conditions is examined. The influence of the crack length is greater than that of the impact speed, plate thickness and notch tip radius. 展开更多
关键词 extended finite element method crack propagation dynamic impact implicit dy- namics
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DYNAMICALLY ASYMPTOTIC SOLUTIONS NEAR MODE II CRACK-TIPS 认领 引用
4
作者 Bo Zhou Zhenqing Wang Wenyan Liang 《Acta Mechanica Solida Sinica》 SCIE EI 2008年第4期369-374,共6页
Description on dynamic behaviours of crack-tips is one of the important foundations to develop a reasonable dynamic fracture criterion.In order to describe the dynamic behaviours of the crack-tip in a material with lo... Description on dynamic behaviours of crack-tips is one of the important foundations to develop a reasonable dynamic fracture criterion.In order to describe the dynamic behaviours of the crack-tip in a material with low viscosity-number,the displacement potential function is assumed as a mathematical expression with exponential singularity.The asymptotic linear differential equations determining plane crack-tip field are established based on the mechanical constitutive model for elastic-viscoplastic materials.According to the conditions of determining solutions for dynamic cracks of mode II,the crack-tip stress fields are numerically simulated based on the asymptotic linear differential equations.Results show the asymptotic linear equations can well describe the crack-tip fields of plane dynamic cracks in the elastic-viscoplastic material with low viscosity-number. 展开更多
关键词 elastic-viscoplastic material dynamic crack asymptotic differential equations
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FWENet:a deep convolutional neural network for flood water body extraction based on SAR images 认领 引用 被引量：11
5
作者 Jingming Wang Shixin Wang +5 位作者 Futao Wang Yi Zhou Zhenqing Wang Jianwan Ji Yibing Xiong Qing Zhao 《International Journal of Digital Earth》 SCIE EI 2022年第1期345-361,共17页
As one of the most severe natural disasters in the world,floods caused substantial economic losses and casualties every year.Timely and accurate acquisition of flood inundation extent could provide technical support f... As one of the most severe natural disasters in the world,floods caused substantial economic losses and casualties every year.Timely and accurate acquisition of flood inundation extent could provide technical support for relevant departments in the field of flood emergency response and disaster relief.Given the accuracy of existing research works extracting flood inundation extent based on Synthetic Aperture Radar(SAR)images and deep learning methods is relatively low,this study utilized Sentinel-1 SAR images as the data source and proposed a novel model named flood water body extraction convolutional neural network(FWENet)for flood information extraction.Then three classical semantic segmentation models(UNet,Deeplab v3 and UNet++)and two traditional water body extraction methods(Otsu global thresholding method and Object-Oriented method)were compared with the FWENet model.Furthermore,this paper analyzed the water body area change situations of Poyang Lake.The main results of this paper were as follows:Compared with other five water body extraction methods,the FWENet model achieved the highest water body extraction accuracy,its F1 score and mean intersection over union(mIoU)were 0.9871 and 0.9808,respectively.This study could guarantee the subsequent research on flood extraction based on SAR images. 展开更多
关键词 Deep learning flood water body extraction SAR Poyang Lake
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