轴向冲击下薄壁圆柱壳的屈曲行为的实验研究

由于薄壁圆柱壳比厚壁圆柱壳的不均匀性更大，薄壁圆柱壳的轴向动力屈曲比厚壁复杂得多。了解轴向冲击下薄壁圆柱壳的屈曲行为，有助于进行吸能构件设计。介绍了采用落锤实验进行圆柱壳的动力屈曲行为研究中，超薄壁圆柱壳的一些特殊屈曲行为，在实验中观察到随着径厚比的增加，折屈边数有相应增加的趋势，存在过渡区。经吸能特性分析，随着圆柱壳径厚比的增加，平均压垮载荷和一个基本变形单元能量吸收量增加，有效压缩距离和一个基本变形单元的初始长度增加，但有效压缩距离与基本变形单元长度之比保持不变；在壁厚相同的条件下，能量吸收量与圆柱壳半径成正比。

Buckling of Thin-wall Cylindrical Shell under Axial Impact

The dynamic buckling behavior of the thin-wall cylindrical shell is more complicated than that of the thick shell due to its more unevenness.To learn the buckling of thin-wall cylindrical shell under axial impact is helpful to the design of energy-absorbing structure.Some special buckling cases are introduced in the experimental study of dynamic buckling of cylindrical shell with a dropping hammer,in which it is observed that with the increase in thickness of shell wall,the number of folding edges tends to increase,and with certain transition zones.The analysis of energy-absorbing features shows that with the increase in the ratio of diameter to thickness of cylindrical shell,the average collapse load and the energy-absorbing volume for a basic deformation unit increase,so do the effective compression distance and the initial length of a basic deformation unit.It is also indicated that the energy-absorbing volume is proportional to the wall radius on the condition that the ratio of effective compression distance to basic deformation unit length maintains unchanged and the wall thickness keeps the same value.