ABSTRACT

The main objective of this paper is to investigate the bearing capacity behaviour of cracked plates considering low-cycle fatigue (LCF) propagation under cyclic loads. The accumulative plastic damage after crack growth is treated as the residual stress and deformation of the plate. In this study, a cracked plate model is proposed to investigate the difference of its residual ultimate strength with preset crack and LCF crack. The present study has analysed the relationship between accumulated lateral deflection and residual stress of cracked plates in different cases. Its effect on the collapse behaviour of the cracked plate is also discussed. The influence factors such as crack length, tensile /compressive cyclic loads, maximum load, minimum load and crack location type are considered in the ultimate strength study of cracked plates. The numerical results clearly reveal the accumulative plastic damage and the bearing capacity behaviour of cracked plates under different cyclic loads.

摘要

本文的主要目的是研究裂纹板在循环载荷下考虑低周疲劳 (LCF) 传播的承载能力行为。裂纹扩展后的累积塑性损伤被视为板的残余应力和变形。在这项研究中，提出了一种裂纹板模型来研究其残余极限强度与预设裂纹和 LCF 裂纹的差异。本研究分析了不同情况下累积侧向挠度与开裂板残余应力的关系。还讨论了它对开裂板的倒塌行为的影响。在开裂板的极限强度研究中，考虑了裂纹长度、拉伸/压缩循环载荷、最大载荷、最小载荷和裂纹位置类型等影响因素。