Bouchbinder Eran, Procaccia Itamar
Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
Phys Rev Lett. 2007 Mar 23;98(12):124302. doi: 10.1103/PhysRevLett.98.124302. Epub 2007 Mar 21.
The stability of a rapid dynamic crack in a two-dimensional infinite strip is studied in the framework of linear elastic fracture mechanics supplemented with a modified principle of local symmetry. It is predicted that a single crack becomes unstable by a finite wavelength oscillatory mode at a velocity vc, 0.8cR<vc<0.85cR, where cR is the Rayleigh wave speed. The relevance of this theoretical calculation to the oscillatory instability reported in the companion experimental Letter is discussed.
在补充了修正的局部对称原理的线性弹性断裂力学框架内，研究了二维无限长带中快速动态裂纹的稳定性。据预测，单个裂纹在速度(v_c)（(0.8c_R < v_c < 0.85c_R)，其中(c_R)是瑞利波速）下会通过有限波长振荡模式变得不稳定。讨论了该理论计算与配套实验快报中报道的振荡不稳定性的相关性。
