关键词: 球罐, 角变形和错边, 应力场, 应力强度因子K_Ⅰ,K_Ⅱ, 光弹性实验, 平板表面裂纹K_Ⅰ

Abstract: The stress field and stress intensity factors of internal surface cracks situated at misalignment or angular distortion in thin spherical shells are studied.The stress distribution and degree of stress concentration at angular distortion or misalignment in spherical shells are presented.The variations of stress intensity factors of internal surface cracks in spherical shells with crack depth to crack length ratio,a/c,crack depth to wall thickness,a/t,and along the crack front,etc..are analysed.And mixed mode stress intensity factors K_Ⅰ and K_Ⅱ at misalignment in spherical shells are discussed.The stress intensity fact.rs of spherical shells with geometrical defects are compared with the soludons of plates subjected to combined tension and bending.The practicability of the soludons in evaluating the stress intensity factors of spherical shells is also appraised.These researches are useful for rating the safety of spherical shells with geometrical defects and surface cracks.