Cumulative-strain-damage model of ductile fracture: simulation and prediction of engineering fracture tests
Cumulative-strain-damage model of ductile fracture: simulation and prediction of engineering fracture tests
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DOI：
10.2172/6628920
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发表时间：
1980-10
期刊：
影响因子：
--
通讯作者：
M. Wilkins;R. Streit;J. Reaugh
中科院分区：
文献类型：
--
作者：
M. Wilkins;R. Streit;J. Reaugh
累积应变损伤准则用于预测延性材料中断裂的萌生和扩展。该模型与涉及空隙增长和聚结的延性断裂模型一致。二维和三维有限差分计算机代码使用增量塑性理论来描述旋转大应变，用于追踪材料因外力而损坏的历史。当损坏在临界距离上超过临界值时，断裂开始，并在其他地方达到临界损坏状态时继续发生。如果材料行为已被充分表征，则这种统一的失效预测方法可以应用于任意几何形状。必须使用各种材料特性测试来校准特定材料的损伤函数。预测了6061-T651铝的断裂韧性。
A cumulative-strain-damage criterion is used to predict the initiation and propagation of fracture in ductile materials. The model is consistent with a model of ductile rupture that involves void growth and coalescence. Two- and three-dimensional finite difference computer codes, which use incremental-plasticity theory to describe large strains with rotation, are used to trace the history of damage in a material due to external forces. Fracture begins when the damage exceeds a critical value over a critical distance and proceeds as the critical-damage state is reached elsewhere. This unified approach to failure prediction can be applied to an arbitrary geometry if the material behavior has been adequately characterized. The damage function must be calibrated for a particular material using various material property tests. The fracture toughness of 6061-T651 aluminum is predicted.