| Impact Buckling and Post-Buckling of Elasto-Viscoplastic Cylindrical Shell Under Torsion |
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| 作者单位： | Wang Deyu Chen Tieyun
Associate Professor，Department of Naval Architecture and Ocean Engineering，Shanghai Jiaotong University，Shanghai 200030 Professor，Department of Naval Architecture and Ocean Engineering，Shanghai Jiaotong University，Shanghai 200030 |
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| 摘 要： | The dynamic torsional buckling and post-buckling of elasto-plastic circular cylindrical shell isstudied.By the usage of the Bodner-Partom constitutive relation,the present visco-plastic problem is treat-ed as an orthotropic elastic problem.Based on the nonlinear large deflection shell therory,the governingdynamic buckling equation is solved by the Runge-Kutta method,and the critical buckling stress is deter-mined by the B-R criterion.The present paper is mainly focused on the imperfection sensitivity,the strainrate sensitivity,and the dynamic post-buckling characters for the shell loaded dynamically with a constantshear strain rate.Numerical results show that the critical shear stress and imperfection sensitivity will in-crease with the increase of strain rate.It is found that the elastic buckling stress is more sensitive toimperfection than the visco-plastic buckling.The present research also reveals some dynamic post-bucklingcharacters for the cylindrical shell,and it is shown that the shell will vibra
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Impact Buckling and Post-Buckling of Elasto-Viscoplastic Cylindrical Shell Under Torsion |
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| Authors: | Wang Deyu Chen Tieyun Associate Professor |
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| Institution: | Wang Deyu Chen Tieyun
Associate Professor,Department of Naval Architecture and Ocean Engineering,Shanghai Jiaotong University,Shanghai 200030 Professor,Department of Naval Architecture and Ocean Engineering,Shanghai Jiaotong University,Shanghai 200030 |
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| Abstract: | The dynamic torsional buckling and post-buckling of elasto-plastic circular cylindrical shell is studied. By the usage of the Bodner-Partom constitutive relation, the present visco-plastic problem is treated as an orthotropic elastic problem. Based on the nonlinear large deflection shell therory, the governing dynamic buckling equation is solved by the Runge-Kutta method, and the critical buckling stress is determined by the B-R criterion. The present paper is mainly focused on the imperfection sensitivity, the strain rate sensitivity, and the dynamic post-buckling characters for the shell loaded dynamically with a constant shear strain rate. Numerical results show that the critical shear stress and imperfection sensitivity will increase with the increase of strain rate. It is found that the elastic buckling stress is more sensitive to imperfection than the visco-plastic buckling. The present research also reveals some dynamic post-buckling characters for the cylindrical shell, and it is shown that the shell will vibrate with the amplitude proportional to the strain rate in elastic buckling but improportional to the strain rate in visco-plastic buckling. An interesting phenomenon is found that when the strain rate is sufficiently high, there is no dynamic visco-plastic buckling occurrence and the shell produces a harmonic oscillation with a very small amplitude. |
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| Keywords: | viscoplasticity cylindrical shell torsion buckling impact |
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