Modelling of dynamic damage and failure in aluminium alloys

Abstract

a b s t r a c tA physically based damage and failure model, applicable to orthotropic metals is proposed in this paper. To account for the physical mechanisms of failure, the concept of thermally activated damage initially proposed by Klepaczko [1], has been adopted as the basis for the model. This assumption makes the proposed damage/failure model compatible with the Mechanical Threshold Strength (MTS) model [2e6], which was used within the overall constitutive model to describe material behaviour in the plastic regime. A shock equation of state [7] was coupled with the rest of the constitutive model to allow for modelling of shock wave propagation in the material. The new model was implemented in DYNA3D [8] and coupled with our in-house non-linear transient SPH code, MCM (Meshless Continuum Mechanics).Parameters for the new constitutive model, i.e. parameters for the plasticity model and the damage model, were derived on the basis of the uniaxial tensile tests and Taylor anvil tests. The subject of investigation is a polycrystalline aluminium alloy AA7010, whose orthotropy is a consequence of mesoscale phase distribution, or grain morphology. Tensile tests were performed for the range of temperatures between 223.15 K and 473.15 K, and strain rates between 6.4 Â 10 À4 s À1 and 6.4 Â 10 2 s À1 .In order to validate the new damage model, a numerical simulation of Taylor anvil tests has been performed for AA7010, using a single stage gas gun at velocity of 200 m/s. The numerical analysis clearly demonstrates the ability of this new model to predict experimentally observed damage and failure.

An Experimental and Computational Study of the High-Velocity Impact of Low-Density Aluminum Foam

“…The Taylor impact test was applied to study the behavior of low-density open-cell aluminum foam at higher strain-rates [21,22]. A foam specimen was accelerated to the desired velocity by a gas gun and then impacted into a rigid wall.…”

Microstructural features effect on the evolution of cyclic damage for polycrystalline metals using a multiscale approach

“…The damage effects are represented on the overall elastic and plastic mechanical behavior of the material by using a scalar or tensorial damage variables to depict the ductile defects initiation and growth and their consequences on the other mechanical fields. Various engineering problems have been conducted using this model (Betten, 1986; Brünig and Gerke, 2011; Brünig and Ricci, 2005; Chaboche, 1992, 1993; Kachanov, 1980; Lemaitre et al., 2000; Liu et al., 2017; Vignjevic et al., 2012a, 2012b; Voyiadjis et al., 2009 ).…”

Multi-scale structure modeling of damage behaviors of 3D orthogonal woven composite materials subject to quasi-static and high strain rate compressions

“…To study the failure mechanisms of textile composites, the damage development and material properties of constituents must be better understood at the microscopic level of RUC. Therefore, a majority of damage models and failure analysis methods have been provided by many scholars in recent years (Campbell et al, 2006;Desrumaux et al, 2001;Huang, 2005;Okabe et al, 2001;Panov et al, 2006;Vignjevic et al, 2012a;Vignjevic et al, 2012b). When 3D textile composites are subjected to the external loading, damage and failure of constituents of tow and matrix within the composites may be happened.…”