Plasticity-Induced Fatigue Crack Closure For Structural Steels In Offshore Applications.
YUTHDANAI PETCHDEMANEENGAM
YUTHDANAI PETCHDEMANEENGAM
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Abstract
This thesis investigates experimentally and numerically the plasticity-induced fatigue crack closure (PIFCC) behavior in S355 offshore structural steels through large-scale in-plane bending fatigue tests of circular hollow section (CHS) X-joints and small-scale fatigue tests of C(T) and M(T) fatigue specimens. The full-scale testings investigate the fatigue performance of the tubular joints fabricated using the enhanced partial joint penetration (PJP+) weld with different applied load ranges, post-weld surface treatments, residual stresses, and overload tests. The small-scale testings examine the effects of in-plane constraints (specimen type) and out-of-plane constraints (thickness and side-grooving). The numerical study utilizes the node-release technique to simulate the fatigue crack closure and to compute the crack opening load. The PIFCC effect in fatigue specimens appears to be strong whereas remains negligible for full-scale tubular joints with surface cracks under constant-amplitude loading.
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Plasticity-induced fatigue crack closure, fatigue cracks, tubular joints, enhanced partial joint penetration welds, overload, node-release technique
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2011-09-16
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Thesis