为了研究低周疲劳载荷下船体加筋板裂纹扩展行为，利用节点释放法研究不同工况下的加筋板低周疲劳裂纹扩展行为，探索加筋条高度、间距对裂纹扩展过程中的应力应变场、累积塑性应变、裂纹闭合效应的影响规律。结果显示，加筋条高度的增加可以增强残余压应力场，导致闭合效应增强，裂纹尖端的累积塑性应变也减小，从而降低裂纹扩展速率。而加筋条间距的增加使得裂纹附近的结构刚度降低，闭合效应减弱，裂纹扩展速率增加。
In order to study low -cut fatigue load under the hull and tendon increase plate crack expansion, use node release method to study the expansion of low -we weekly fatigue cracking expansion under different working conditions, explore the height of the gluten and spacing to the crack expansion process. The influence of the field, accumulating plastic strain, and crack closed effect. The results showed that the increase in the height of the gluten bar can enhance the residual pressure stress field, resulting in an enhancement of the closed effect, and the cumulative plastic strain at the tip of the cracks also decreased, thereby reducing the fissure expansion rate. The increase in the spacing of the gluten strip has reduced the structure stiffness near the crack, the closed effect weakens, and the fissure expansion rate increases.
2023,45(7): 10-17 收稿日期：2022-04-30
DOI：10.3404/j.issn.1672-7649.2023.07.003
分类号：U416.217
基金项目：国家自然科学基金项目资助（51779198）
作者简介：金思远(1992-),男,硕士研究生,主要研究方向为结构安全性与可靠性分析
