A digital twin approach toward unlocking elasto-plastic fatigue crack growth rates under negative load ratios

被引:3
作者
Cheok, Evan Wei Wen [1 ]
Qian, Xudong [1 ]
Quek, Ser Tong [1 ]
Si, Michael Boon Ing [1 ]
机构
[1] Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117576, Singapore
关键词
Digital twin; Data -driven approach; Cracks; Elasto-plastic fatigue crack growth; Variable amplitude loading; HIGH-STRENGTH STEEL; PROPAGATION; PREDICTION;
D O I
10.1016/j.engfracmech.2024.110034
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
This paper introduces a novel digital twin solution for unlocking the elasto-plastic fatigue crack growth within an S550 steel under negative load ratios. The digital twin transforms solely strain data from a strain-interfaced welded plate joint specimen to the load-displacement curve to compute cyclic J-integral values using the eta approach, eliminating the need for load and displacement measurements. The accurate computation of the elasto-plastic Delta J effectively extends the fatigue crack growth relationship derived from standard fracture specimens. The extended fatigue crack growth relationship accurately predicts the fatigue life of specimens under separate step-up and step-down variable amplitude loading regimes.
引用
收藏
页数:17
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