摘要
应力强度因子KI是缺陷结构安全评定的必要参数。利用有限元分析软件ANSYS自顶向下建模方法得到弯管内壁环向裂纹模型,并对KI进行计算与分析。结果表明:随裂纹深度a及裂纹半角θ的增大,KI都是先增大后平缓;KI与纵向裂纹角θ1无关;KI随环向裂纹角θ2的变化有3个波峰,自弯管外侧起分别为60°、180°与300°。因此,当a>4 mm,θ>20°且裂纹位于θ2的波峰位置时,结构处于最危险状态,需给予足够关注。
The stress intensity factors（SIFs） is necessary parameter for safety evaluation of defect structure.With the top-down method of finite element analysis software ANSYS,this paper building bent pipes with annular surface cracks in the internal wall and calculate and analyze the SIFs.Results shows that the SIFs goes from increase to smoothness with the increase of depth a of cracks and half-angle θ of cracks.The longitudinal crack angle θ1 has no relationship with the SIFs.The SIFs is greatly affected by the crack angle θ2.Three peaks exist when θ2 is equals to 60°,180° and 300° respectively.Hence,we should pay more attention when a is exceeds 4 mm,θ exceeds 20° and the ring crack angle is located on one of the three crests,due to the fact that construction is dangerous.
出处
《管道技术与设备》
CAS
2012年第6期1-3,26,共4页
Pipeline Technique and Equipment
关键词
有限元法
应力强度因子
纵向裂纹角
环向裂纹角
finite element
stress intensity factors
angle of longitudinal crack
angle of ring crack
