Computational simulation of the relaxation of local stresses due to foreign object damage under cyclic loading

Davis, T., Ding, J., Sun, W. & Leen, S.B, (2010) "Computational simulation of the relaxation of local stresses due to foreign object damage under cyclic loading," Proc. IMechE, Part L: J. Materials: Design and Applications, 2010, 224 (L2), 41-50.

Abstract

In this study, the phenomenon of residual stress relaxation from foreign object damage (FOD) is numerically simulated using a hybrid explicit¿implicit finite-element method. The effects of cycle fatigue loadings on stress relaxation were studied. FOD is first simulated by firing a 3 mm cube impacting onto a plate made of titanium alloy Ti-6Al-4V at 200 m/s. The FOD impact produces two distinct stress concentrations: one is compressive directly beneath the impact site; the other is tensile around the outer edge of the impact. The plate was then assumed to be subjected to a cyclic fatigue loading. The stress relaxation was investigated under a range of stress ratios and maximum applied stresses. Two different material models were considered for the simulations, namely an elastic¿perfectly plastic model and a non-linear kinematic hardening model.

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