基于LS-DYNA的高压气瓶跌落仿真分析

采用有限元分析软件ANSYS中的LS-DYNA模块对高压气瓶在无内压的状态下进行跌落仿真分析。气瓶跌落高度设为2m,并分别以水平、45°倾斜、垂直3种角度自由跌落。结果表明,水平跌落时,气瓶肩部受力最大,为505MPa,气瓶没有发生塑性变形;45°倾斜跌落时,气瓶与地面接触部位应力最大,为734MPa,接近材料的屈服强度,气瓶发生塑性变形;垂直跌落时,气瓶所受冲击力最大,最大应力为1500 MPa,远大于材料的屈服强度,气瓶发生较大塑性变形;45°倾斜跌落和垂直跌落时,气瓶均处于危险状态。

Simulation analysis of high-pressure gas cylinder dropping based on LS-DYNA

A simulation analysis was carried out of high-pressure gas cylinder dropping in the absence of internal pressure condition with the use of module LS-DYNA in ANSYS. With the dropping height set at 2meters, let the cylinder take a free fall horizontally, vertically and at 45degrees, respectively. The result shows that the gas cylinder bears a stress of 505MPa, the maximum one, when falling horizontally, and it suffers no plastic deformation; when the cylinder falls at the angle of 45degrees, a maximum stress of 734MPa, close to the yield strength of the material, is felt at the point where the gas cylinder is in contact with the ground, which leads to the plastic deformation of the cylinder; and when falling vertically, the cylinder will suffer from the maximum impact force, with the maximum stress at 1500MPa, far greater than the yield strength of the material and the cylinder undergoes larger plastic deformation. The cylinder is in a dangerous state when falling vertically or at the angle of 45degrees.