Experimental Yield Surface Determination for Metal Matrix Composites

A simplified formula to estimate the size of the cyclic plastic zone in metals containing elastic particles

“…The poor performance of the homogenized model may stem from several factors. One is its inability to capture the shape of the plastic zone in front of the crack -see the previous section and Figure 6 -which supports the claims mentioned in the introduction that the associated von Mises plasticity is not the best choice for metals containing particles [8,9]. Another factor is the continuous yielding behavior of the composite, well-known for similar materials [11,20], which is in contrast with the common modelling assumption of a sharp threshold for plastic flow.…”

“…Then, since Eq. (8) states that the two points must have the same values of and , consistency requires that 0 in Eq. (7).…”

“…There are two challenges associated with the implementation of the boundary conditions specified by Eqs. ( 7) and (8) in the micro-scale resolved model. The first is that the finite element mesh is not symmetric.…”

“…Second, there is experimental and numerical evidence that plasticity driven by the von Mises stress, which forms the backbone of the derivation of Eqs. ( 1) and (2), is not optimal to describe the inelastic deformation of metals containing particles [8,9].…”