Abstract
The influence of residual stress on the fatigue crack growth behavior of HT 80 steel weldments under two-step block loadings was evaluated by utilizing linear elastic fracture mechanics. The crack growth rates of the welds were dominated by residual stress rather than the block size or the load sequence. The crack opening stress intensity factor, Kop, in the welds subjected to two-step loading was found to be almost the same in each block and was governed by the maximum stress intensity factor in the block. The crack growth rates of the welds with residual stress under two-step block loading were correlated with the effective stress intensity factor range, ΔKRem, estimated based on linear accumulation of the stress intensity factor range which is defined as Kirmax - Kop, where Kirmax is the maximum stress intensity factor which takes into account the residual stress at each step in a block.
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