摘要
应力强度因子是衡量裂纹尖端应力集中水平的一个重要的参数.针对工程中常用的薄壁钢管结构断裂问题,采用有限元方法研究含有环向内裂纹的薄壁钢管结构在纯弯曲状态下的断裂力学响应,分析不同裂纹深度和环向裂纹长度对裂纹前端应力强度因子变化的影响,得到相关的灵敏度曲线.结果表明,在纯弯曲状态下,裂纹深度和环向裂纹长度对应力强度因子的影响规律不相同.
The stress intensity factor is an important parameter used to judge the stress level at crack tip.Aimed at the fracture problem in the thin-walled steel tubular structures common in engineering,the fracture mechanic response of thin-walled steel tubular structure with circumferential crack to the pure bending is studied by using finite element method.The influence of radial crack depths and circumferential crack lengths on variations of stress intensity factors is analyzed,so that the relevant sensibility curve is obtained.Numerical results show that different radial crack depths and circumferential crack lengths will have different effects on stress intensity factors.
出处
《兰州理工大学学报》
CAS
北大核心
2014年第5期169-172,共4页
Journal of Lanzhou University of Technology
基金
国家自然科学基金青年基金(11102059)
关键词
薄壁钢管结构
环向裂纹
纯弯曲
J-积分
应力强度因子
thin-walled steel tubular structure
circumferential crack
pure bending
J-integral
stress intensity factor
