Numerical and Experimental Study of the Ductile Failure of 7075-T651 Aluminum

摘要

A combined experimental/numerical analysis has been performed on the nonlinear response and ductile failure of 7075-T651 aluminum. The different specimen shapes which were tested and analyzed produced: (1) pure shear; (2) uniaxial; (3) biaxial; and (4) triaxial states of stress in an axisymmetric geometry. Experiments performed on these specimens were subsequently analyzed with large strain finite element calculations. The calculations closely modelled experimental behavior. The calculated stresses and strains were then used to study ductile multiaxial failure criteria for monotonic loading configurations. This study concludes that the strain at which 7075-T651 aluminum fails is dependent upon the existing triaxial stress field, the higher the triaxiality, the smaller the effective plastic strain at failure. The relationship between strain at failure and the degree of triaxiality is given by the failure criteria. (ERA citation 06:023913)