Mode I Fatigue Crack Growth Behaviour in a Welded Cruciform Joint under Biaxial Stresses
Biaxial load fatigue crack growth tests were performed for a cruciform joint made of aluminium-lithium alloy 2198-T8 containing a butt weld joint fabricated by the friction stir welding process.In all tests crack propagated in parallel with the weld joint.Two material rolling directions were studied in relation to the welding and crack growth direction,showing that the material rolling direction affects the crack growth path.Specimens welded orthogonally to the rolling direction exhibit shorter fatigue life than specimens welded parallel to the rolling direction.A simple method is then developed for predicting crack growth rate.FEM is used to calculate the stress intensity factors and T stress,which are subsequently used to predict the crack propagation rates and trajectory.Influence of applied stress biaxiality on stress intensity factors,T stress,crack trajectory and growth rates have been analysed.Out-of-plane bending caused by the specimen geometry is also modelled.Predicted and test measured crack growth lives are in reasonably good agreement.Reasons for discrepancy are discussed.
Biaxial stresses weld joint crack propagation fatigue finite element method aluminium alloy
Xiang Zhang Haiying Zhang Rui Bao
Department of Aerospace Engineering,School of Engineering,Cranfield University,Bedford,MK43 0AL,UK Aircraft Strength Research Institute,Xi’an,710065,P.R.China Institute of Solid Mechanics,School of Aeronautic Science & Engineering,Beihang University,Beijing,1
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）