Continuum Damage Modeling for Dynamic Fracture Toughness of Metal Matrix Composites

Abstract

Short fiber reinforced metal-matrix composites (MMCs) have widely adopted as structural materials and many experimental researches have been performed to study fracture toughness of it. Fracture toughness is often referred as the plane strain(maximum constraint) fracture toughness K Ic determined by the well-established standard test method, such as ASTM E399. But the application for dynamic fracture toughness K Id has not been popular yet, because of reliance in capturing the crack propagating time. This paper deals with dynamic fracture toughness testing and simulation using finite element method to evaluate fracture behaviors of MMCs manufactured by squeeze casting process when material combination is varied with the type of reinforcement (appearance, size), volume fraction and combination of reinforcements, and the matrix alloy. The instrumented Charphy impact test was used for K Id determination and continuum damage model embedded in commercial FE program is used to investigate the dynamic fracture toughness with the influence of elasto-visco-plastic constitutive relation of quasi-brittle fracture that is typical examples of ceramics and some fibre reinforced composites. With Compared results between experimental method and FE simulation, the determination process for K Id is presented. FE simulation coupled with continuum damage model is emphasized single shot simulation can predict the dynamic fracture toughness, K Id and real time evolution of that directly.

Computational investigation of structured shocks in Al/SiC‐particulate metal‐matrix composites

“…For example, the micro-structure length scale which is being emphasized in the model can be used for the MMC-material model classification. This classification typically yields the following classes of MMC-material models: continuum length-scale (Lee et al, 2009), grain-size length-scale (Abu Al-Rub, 2009) and atomistic length-scale (Dang and Grujicic, 1997). Alternatively, MMC-material models can be classified according to the morphology (and size) of the reinforcements as whiskers-reinforced MMCs (Davis, 1993), particulate-reinforced MMCs (Hunt et al, 1990), dispersion-reinforced MMCs (Davis, 1997), etc.…”

Phase field modeling of dynamic fracture in elastoplastic composites with interfacial debonding

“…The well-known theories for the discrete approaches are the discrete elements [3,4], peridynamics [5][6][7], cohesive models [8][9][10], and the extended finite element method (XFEM) [11][12][13]. Continuum damage mechanics is probably the most widely used theory categorized in the continuous fracture approach [14,15].…”