Abstract
Using the three-dimensional finite element method, the researches on the linear elastic and the nonlinear elasto-plastic fracture behaviors of all-steel gas cylinders with different axially oriented cracks were carried out. The crack mouth opening displacement CMOD and the crack driving forces for the cylinders containing axial deep cracks, which have the crack depth of 25%–100% of the wall thickness, and the crack length of ten times the wall thickness, were obtained. The effects of the location of the cracks (whether external or internal) and the shape of the through-thickness crack front (whether elliptical or straight front) on the crack driving forces are respectively quantified in the linear elastic deformation state and in the elasto-plastic deformation state.
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