Crack Branching Characteristics at Different Propagation Speeds: From Quasi-Static to Supersonic Regime

被引：2
|
作者：
Jia, Y. J. [1 ]
Liu, B. [1 ]
机构：
[1] Tsinghua Univ, Dept Engn Mech, CNMM, AML, Beijing 100084, Peoples R China
来源：
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME | 2014年 / 81卷 / 12期
基金：
中国国家自然科学基金;
关键词：
dynamic fracture; supersonic crack propagation; crack branching; DYNAMIC FRACTURE; DISSIPATIVE WAVES; PHASE-TRANSITION; INSTABILITY;
D O I：
10.1115/1.4028811
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Classical dynamic fracture mechanics predicts that the crack branching occurs when crack propagation speed exceeds a subsonic critical velocity. In this paper, we performed simulations on the dynamic fracture behaviors of idealized discrete mass-spring systems. It is interesting to note that a crack does not branch when traveling at supersonic speed, which is consistent with others' experimental observations. The mechanism for the characteristics of crack branching at different propagation speeds is studied by numerical and theoretical analysis. It is found that for all different speed regimes, the maximum circumferential stress near the crack tip determines the crack branching behaviors.
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页数：4
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