Cracks break the sound barrier
Cracks break the sound barrier
复制标题
裂缝突破音障
DOI：
10.1126/science.adj0963
复制
发表时间：
2023
期刊：
影响因子：
56.9
通讯作者：
Marder, Michael
中科院分区：
文献类型：
--
作者：
Marder, Michael
大多数固体都有小到看不见的裂缝，当它们长大并撕裂物体时，它们是危险的。因此，裂纹动力学的研究是断裂力学的一个重要组成部分，断裂力学解释了裂纹材料在屈服之前所能承受的应力。这种理解对于从飞机安全到地震探测和预测的应用至关重要。几十年来，人们对在拉伸状态下被拉开的物体中裂纹扩展的速度极限达成了共识。这个极限是声音在自由表面传播的速度，称为瑞利波速度。在本期的第415页，Wanget al.report认为瑞利波的速度毕竟不是极限，裂缝可以以音速甚至更高的速度传播。
Cracks at scales too small to see permeate most solid objects, and they are dangerous when they grow and rip things apart. Thus, the study of crack dynamics is an important part of fracture mechanics—the discipline that explains the stress that cracked materials can sustain before they give way. This understanding is essential for applications ranging from airplane safety to earthquake detection and prediction. For many decades, there has been a consensus on the speed limit to crack propagation in a body pulled apart in tension. The limit is the speed at which sound travels across a free surface, called the Rayleigh wave speed. On page 415 of this issue, Wanget al.report that the Rayleigh wave speed is not the limit after all; cracks can travel at the speed of sound and beyond.
拉伸裂纹可以打破经典的速度限制
影响因子：
56.9
作者：
Mei Wang;Songlin Shi;J. Fineberg
通讯作者：
J. Fineberg