Study of dynamic behavior of ceramic-metal FGM under high velocity impact conditions using CSPM method

In Problems with large deformation including fracture and fragmentation, the grid b methods have some limitations which make them unsuitable for simulating these type of problems. An example is extreme mesh distortion in a lagrangian approach like F element method. Another situation is the inability of Eulerian based formulations in tr ing the history of a desired physical property at the interface of multi materials include impact problems. A promising solution is taking the advantage of meshless and par based methods which do not use any kind of grid in the physical domain of problem. In paper, corrective smoothed particle algorithm (CSPM) as a meshless particle method used to study the mechanical behavior of a ceramic-metal functionally graded mat (FGM) under high velocity impact conditions. A mixed strength model with sigmoid for lation has been used to describe both yielding and fracture phenomena in the FGM. strength model includes the JC dynamic yield relation and Johnson-Holmquist-Be (JHB) fracture model with a continuum damage description approach. An efficient re malization in continuity density approach is used to improve the smoothed particle hy dynamics (SPH) approximation of boundary physical variables. This study shows CSPM in combination with the proper strength model describing the FGM dynamic behavior, can predict the mixed plastic and brittle response of a ceramic-metal functional graded material under high impact velocities. (C) 2011 Elsevier Inc. All rights reserved.