Condition for Crack Growth in High-Strength Ductile Materials
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概要
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It has been shown in a previous paper that the maximum normal stress infront of a crack tip in non-hardening materials becomes 3-4 times tensile yieldstress. A spherical cavity in non-hardening materials can grow when the internalpressure exceeds a critical value, which is the same order of magnitude as themaximum normal stress near the crack tip. A formula for the critical pressure inwork-hardening (high-strength) materials is obtained with a modification in thecalculation process of non-hardening materials. The fracttu'e toughness (Kj,z)is formulated on the assumption that the size of the region satisfying the cavitygrowth condition exceeds the dimple size observed on the fracture surface. Theresult showed that K I. decreases with increasing yield stress.
- 社団法人日本物理学会の論文
- 1979-10-15
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