A STOCHASTIC MODEL OF FATIGUE CRACK GROWTH

A STOCHASTIC MODEL OF FATIGUE CRACK GROWTH
复制标题

疲劳裂纹扩展的随机模型

DOI：
--
复制
发表时间：
1994
期刊：
--
影响因子：
--
通讯作者：
H. Polezhayeva
H. Polezhayeva
中科院分区：
--
文献类型：
--
作者：
A. A. Vakulenko;S. Petinov;H. Polezhayeva

文献摘要

被引文献

相似文献

在船体结构疲劳分析中，裂纹扩展通常用Paris-Erdogan方程来近似，该方程的参数是从试验中得到的，并且被认为是材料常数。这导致了确定性的寿命-裂纹长度关系，它可能是非保守的。为了改进这一点，提出了一个裂纹扩展的随机模型。它假定裂纹尖端与多晶金属中的随机场缺陷相遇，并且在裂纹尖端附近，由于影响裂纹扩展的载荷历史而形成随机损伤场。为支持该模型，对低碳中强度船用钢试件进行了裂纹扩展试验。
Crack growth in fatigue analysis of ship structures is usually approximated by the Paris-Erdogan equation, parameters of which are found from tests and regarded as material constants. This results in deterministic life - crack length relations which may be non- conservative. To improve this, a stochastic model of crack growth is suggested. It assumes that the crack tip meets a random field of defects in polycrystalline metal, and that, in vicinity of the crack tip, a random damage filed is formed due to the load history affecting the crack extension. To support the model, crack propagation experiments were performed on specimens of low carbon medium tensile strength ship steel.