外压无折边直斜锥壳容器屈曲模拟计算与研究

以受外压的无折边直斜锥壳及正锥壳为研究对象,对两种锥壳进行了外压屈曲模拟计算,得到了屈曲失稳模态,结果表明,两种锥壳由于轴对称性的差异造成了屈曲失稳模态形状完全不同,无折边直斜锥壳失稳时表现为局部失稳,正锥壳则表现为整体失稳;此外,还讨论了几何参数对屈曲失稳临界压力值可能造成的影响。结果表明,一方面,锥壳半顶角对两种锥壳的屈曲失稳临界压力值存在较大影响;另一方面,在不同的锥壳小端直径下,无折边直斜锥壳的锥壳半顶角对其屈曲失稳临界压力值的影响程度存在差异;最后,随着锥壳轴向长度的缩短,两种锥壳的屈曲失稳临界压力值先逐渐增大、后逐渐减小。

Buckling behavior of micro metal wire on polymer membrane under combined effect of electrical loading and mechanical loading

The buckling behavior of a typical structure consisting of a micro constantan wire and a polymer membrane under coupled electrical-mechanical loading was studied. The phenomenon that the constantan wire delaminates from the polymer membrane was observed after unloading. The interfacial toughness of the constantan wire and the polymer membrane was estimated. Moreover, several new instability modes of the constantan wire could be further triggered based on the buckle-driven delamination. After electrical loading and tensile loading, the constantan wire was likely to fracture based on buckling. After electrical loading and compressive loading, the constantan wire was easily folded at the top of the buckling region. On the occasion, the constantan wire buckled towards the inside of the polymer membrane under electrical-compressive loading. The mechanisms of these instability modes were analyzed.