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首页> 外文会议>Eighth International Fatigue Congress Vol.3, Jun 3-7, 2002, Stockholm, Sweden >PROPAGATION OF A SHORT FATIGUE CRACK MODELED BY A BOUNDARY ELEMENT APPROACH
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PROPAGATION OF A SHORT FATIGUE CRACK MODELED BY A BOUNDARY ELEMENT APPROACH

机译：用边界元方法模拟的短疲劳裂纹的传播

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摘要

Mode I growth of a microstructurally short edge crack, subjected to high cyclic loading, is studied using a boundary element formulation. The crack is assumed to grow due to local plasticity, modeled by the emission of discrete dislocations from the crack tip. The dislocations will slip along crystallographically preferred directions as long as the Peach-Koehler force is larger than the lattice friction force. Load reversal causes a fraction of the discrete dislocations to move back towards the crack surfaces were they are annihilated. The crack itself is modeled by a distribution of dislocation dipoles. At each moment an equilibrium state, were the shape of the crack and the locations of the discrete dislocations are in balance, is found. No overlap between the crack surfaces is allowed. The introduction of a grain boundary causes pile up of the discrete dislocations, but do not change the emission/annihilation-characteristics significantly. The material under consideration is ferritic iron.
机译：使用边界元素公式研究了承受高循环载荷的微观结构短边裂纹的I型增长。假定裂纹是由于局部塑性而增长的，该塑性是通过从裂纹尖端发射离散位错来模拟的。只要Peach-Koehler力大于晶格摩擦力，位错就会沿着晶体学上的优选方向滑动。载荷逆转会导致一部分零散的位错在被an灭时向裂缝表面移动。裂纹本身是通过位错偶极子的分布来建模的。在每个时刻都找到一个平衡状态，即裂纹的形状和离散位错的位置是否处于平衡状态。裂纹表面之间不允许重叠。晶界的引入引起离散位错的堆积，但不会显着改变发射/ an灭特性。所考虑的材料是铁素体铁。

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