液压膨胀环动态拉伸碎裂的有限元模拟

液压冲击膨胀环实验平台能有效地实现韧性金属圆环在高应变率拉伸载荷作用下的动态断（碎）裂。本文采用流固耦合的有限元数值计算方法，模拟了实验过程中金属圆环在高压液体作用下的运动、变形和断裂现象。分析了装置和试件的接触应力对试件碎裂过程的影响并讨论了如何实现液压对试件的有效加载。计算结果表明，实验中的初始接触应力和液体的较长时间加载对试件的碎裂过程没有显著影响；在合理的加载条件下，液压膨胀环实验技术是研究固体动态拉伸碎裂的有效手段。

FEM simulation of Dynamic Fragmentation of Liquid-driving Expanding Ring

The experimental platform of liquid-driving expanding ring can effectively realize the dynamic fracture of the ductile metal ring under the high strain rate tensile load. In this work, the finite element simulation of fluid–structure interaction method was used to simulate the metal ring’s movement, deformation and fracture under the action of high-pressure liquid. This paper analyzed the influence of the contact stress between the device and the specimen in the fragmentation process, and discussed how to realize the effective loading by hydraulic pressure to the specimen. The simulation results show that the initial contact stress and the longer liquid load have little effect on the fracture process of the specimen. By giving the proper loading condition, the liquid-driving expanding ring device can absolutely satisfy the one dimension stress condition and the free expanding of the ring.