摘要
以弯管为研究对象,采用有限元法对弯管中间横截面应力分布规律和塑性极限载荷进行研究,给出了弯管在内压和弯矩载荷下的应力分布情况,指出了弯矩载荷下弯管中间截面最大轴向应力点位置和计算公式,分析了中间截面上不同位置周向裂纹缺陷对弯管塑性极限弯矩载荷的影响。结果表明,对于弯曲半径比较小,径厚比较大的弯管应将周向裂纹缺陷定位在最大轴向应力点确定弯管弯矩承载能力,为进一步研究弯管塑性极限弯矩,完善弯管失效评定奠定基础。
Taking elbow pipe as the object of study, the finite element method was adopted to investigate axial stress distribution on the cross section of the elbow pipe and plastic limit load; and the stress distribution there under internal pressure and bending load was summarized, including location of the maximum axial stress and its calculation formulation. Analyzing the position effect of circumferential crack defects on the elbow pipe＇ s bearing capacity shows that, as for the elbow pipe with smaller bending radius and bigger diameter-thickness ratio, the circumferential crack defect should be located at the spot of the maximal axial stress so as to determine the elbow＇ s bearing capacity and lay the foundation for further study of the plastic ultimate bending moment and improvement of elbow failure assessment.
出处
《化工机械》
CAS
2016年第3期390-396,共7页
Chemical Engineering & Machinery
关键词
弯管
周向裂纹
塑性极限弯矩
失效评定
elbow, circumferential crack, plastic limit bending moment, failure assessment
作者简介
万晋，男，1957年7月生，副教授。福建省福州市，350108。
