Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 30, Issue 12, Pages 1127-1139Publisher
WILEY
DOI: 10.1111/j.1460-2695.2007.01181.x
Keywords
axial part-through surface crack; finite element analysis; J estimation; limit pressure; reference stress approach
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This paper provides net-section limit pressures and a reference stress based F estimation method for pipes with constant depth, internal axial surface cracks under internal pressure. Based on systematic small strain finite element (FE) limit analyses using elastic perfectly plastic materials, net-section limit pressures are firstly determined, and based on FE results, a closed-form limit pressure solution is proposed. Furthermore, based on the proposed limit pressure solution, a method to estimate elastic-plastic F is proposed based on the reference stress approach. When the reference stress is defined by the proposed (global) limit pressure, estimated F values based on the reference stress approach are overall slightly lower than FE results, implying that the method is non-conservative. By re-defining the reference using optimised reference loads, resulting F estimates agree well with FE results.
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