The mechanical behaviour of a 7 series high‐strength aluminium alloy that is mainly used by the aerospace industry is under investigation. Aluminium alloy AA7449‐T7651 is mechanically tested at high strain rates (SRs), from 1000 to 10,000 s−1 and from room temperature up to elevated temperatures (80, 140, 200, and 300°C). The mechanical characterisation is performed in compression by means of an experimental Split Hopkinson Pressure Bar facility. The material's flow stress (σn) and maximum stress are significantly affected by both temperature and SR Nowadays, where the numerical simulation of several mechanical applications and processes that involve high deformation rates is a requirement the mechanical behaviour of the material should be described accordingly. The experimental data are utilised to calculate the SR hardening coefficients of two commonly used material models: Cowper Symonds and Johnson‐Cook.
An investigation of a shot peening induced residual stress field in an aluminium alloy plate is performed both experimentally, as well as by developing a numerical simulation model capable of predicting the residual stress profile. Shot peening induced residual stresses are measured by the hole drilling technique. Experimental results provide through-the-thickness residual stress profiles of shot peening treated AA7449-T7651 plates under different shot intensities. Experimentally measured residual stresses are compared to the respective residual stress distributions computed by the finite element model for verification and validation purposes. The numerical model comprises a single steel shot impacting on the aluminium target plate. The steel shot is considered as elastic deformable body, while the target aluminium plate material is considered elastic-plastic with strain hardening. After its successful validation, the numerical model is applied to the parametric study of the effect of shot velocity and shot size on the induced residual stress profile.
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