CAJ | 학술논문

采用三维奇异单元模拟裂纹前缘应力应变场的奇异性，建立了计算球形压力容器中埋藏裂纹应力强度因子的有限元模型，有限元分析结果和经验公式计算结果吻合较好，证明所建有限元模型具有较高的准确性和可靠性。通过仿真计算，分析不同因素对应力强度因子的影响，得出了裂纹前缘应力强度因子随裂纹形状、容器壁厚以及裂纹中心与壁厚中心的偏移量与壁厚比值的变化规律。
채용삼유기이단원모의렬문전연응력응변장적기이성，건립료계산구형압력용기중매장렬문응력강도인자적유한원모형，유한원분석결과화경험공식계산결과문합교호，증명소건유한원모형구유교고적준학성화가고성。통과방진계산，분석불동인소대응력강도인자적영향，득출료렬문전연응력강도인자수렬문형상、용기벽후이급렬문중심여벽후중심적편이량여벽후비치적변화규률。
3D singular elements are employed to describe the singularity of stress‐strain field of crack front ,and the finite element model for calculating stress intensity factor of embedding cracks in spherical pressure vessel is established .The FEM results agree well with the data calculated from em‐pirical formula ,which proves the built finite element model is accurate and reliable .The influences of different factors on the stress intensity factor are analyzed by simulation ,and the varying patterns of stress intensity factor at the crack front with crack shape ,wall thickness of vessel and the ratio of the offset of crack center and wall center to wall thickness are obtained .