The effect of residual stress on mixed-mode crack propagation behavior
in friction stir welded 7075-T6 aluminum alloy panel under biaxial
loading
Abstract
The bi-axial 7075-T6 Al alloy samples were designed and manufactured by
Friction Stir Welding (FSW). The residual stress profiles were measured.
Crack propagation behavior were simulated with five different biaxial
loading ratios. ABAQUS software was used to calculate the stress
intensity factors (SIFs) and to study the effects of residual stress on
crack behaviors. It is found that residual stress can affect the effect
of biaxial loading ratio on crack growing. Mode I and mode II SIFs are
susceptible to residual stress when λ= 0.5~2. Cracks at
the retreating side are much more affected by the residual stress. At
given biaxial loading ratio, the distribution characteristics of SIF
components have similarity on the advancing side and the retreating
side.