摘要
裂纹是引起管道开裂失效的主要原因,裂纹尖端应力强度因子是表征裂纹应力场强度的主要物理量,也是对管道进行安全评估时的主要依据之一,但管道不同于平板,有曲率影响,因此基于平板推导出来的裂纹尖端应力强度因子公式必须进行修正。为了准确计算管道上斜裂纹应力强度因子,建立了不同管道直径、不同裂纹倾角以及不同裂纹长度下的管道穿透斜裂纹有限元模型,并计算了裂纹尖端应力强度因子,在无限大板中心斜裂纹应力强度因子计算公式基础上,修正得到了管道穿透斜裂纹应力强度因子计算公式,这对于含裂纹管道安全评定有重要参考价值。
Crack is the main cause of pipeline fracture failure.Stress intensity factor is the major mechanical parameter to characterize the strength of the stress fields at crack tips and the main indicator for pipeline safety evaluation.Unlike infinite plates,there exist curvatures of pipelines,so the calculation formula for the stress intensity factors on infinite plates must be revised.In order to accurately calculate the stress intensity factors of inclined cracks on pipelines,finite element analysis models for pipeline inclined through-thickness cracks with different pipe diameters,different crack inclination angles and different crack lengths were established and the stress intensity factors at the crack tips were calculated.The calculation formula of the stress intensity factors of inclined through-thickness cracks on pipelines were fitted by modifying the formula of the stress intensity factors at the center of infinite plates,which provide valuable references for the safety assessment of the pipelines containing cracks.
作者
崔远洋
李慧芳
钱才富
吴志伟
CUI Yuanyang;LI Huifang;QIAN Caifu;WU Zhiwei(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《压力容器》
北大核心
2023年第4期30-36,66,共8页
Pressure Vessel Technology
关键词
管道
穿透斜裂纹
应力强度因子
pipeline
inclined through-thickness crack
stress intensity factor
