An isolated cohesive crack in tension
An isolated cohesive crack in tension
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受拉的孤立内聚裂纹
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Shen Wang
中科院分区：
文献类型：
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作者：
J. Dempsey;L. Tan;Shen Wang
从北极和南极第一年海冰的原位断裂中获得的反算应力分离曲线的形状是凸的，并且与混凝土的形状完全不同。在这些试验中，过程区尺寸随裂纹扩展而变化，但这种变化的性质随试验条件、载荷控制或位移控制而不同。这些结果促使一个更密切的审查的凝聚裂纹模型，使用最简单的开裂配置，有限凝聚裂纹在无限大的弹性介质中加载在张力由一个均匀的应力在无穷大。不同类型的应变软化检查：矩形软化，线性软化，规定的凝聚应力，和规定的凝聚裂纹张开位移。对于每一种情况，裂纹成核进行检查，密切关注的是测试控制条件，无论是负载控制或固定夹具。试验控制条件显著改变断裂、裂纹成核、裂纹生长和工艺区尺寸行为。线性软化的精确近似解提出和检查。
The shape of the back-calculated stress-separation curves obtained from the in-situ fracture of first-year sea ice in the Arctic and Antarctic is convex, and radically different from those for concrete. In these tests, the process zone size changes with crack growth, but the nature of this change differs with the test conditions, load-control or displacement control. These results prompted a closer examination of the cohesive crack model using the simplest cracked configuration, a finite cohesive crack in an infinite elastic medium loaded in tension by a uniform stress at infinity. Different types of strain softening are examined: rectangular softening, linear softening, prescribed cohesive stresses, and prescribed cohesive crack-opening displacements. For each of these cases, crack nucleation is examined; close attention is paid to test control conditions, be they load-control or fixed-grip. The test control conditions alter the fracture, crack nucleation, crack growth, and process zone size behavior significantly. Accurate approximate solutions to linear softening are presented and examined.