The Elastic-Plastic Fracture Mechanics Analysis for Surface Cracked Spherical Pressure Vessel
This paper, based upon the nonclassical spherical shell theory, constructed a nonlinear line-spring model of work hardening material with Ramberg-Osgood constitutive relation for the elastic-plastic fracture analysis of surface cracked spherical pressure vessel, and calculated the elastic-plastic fracture parameters of the structure. The influences of inner pressure, crack shape, curvature of the vessel and material mechanical properties on the elastic-plastic fracture nature of the surface crack were studied as well. It was proved that the theoretical predictions of present model agreed well with experimental results.
KeywordsSurface Crack Crack Shape Initiation Toughness Material Mechanical Property Line Spring
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