Numerical modeling and analysis of static and ballistic behavior of multilayered/multiphase composite materials using detailed microstructural discretization.

摘要

The goal of this work is to analyze the static and ballistic performance of multi material systems using a detailed finite element analysis. As more complex materials systems are introduced in engineering practice, the design engineer faces the dilemma of utilizing homogenization techniques or detailed numerical models. The latter offers a number of advantages, such as the ability to introduce separate constitutive laws and failure criteria for each phase, at the expense of computation cost. This is particularly important in ballistic performance of armor where the sequence of failure of each phase plays a major role in the energy absorption.; Here, we present an automatic geometry generation algorithm for composite materials that can generate complex composite geometries spanning several unit cells. This capability is utilized to study the following phenomena: (1) Static behavior of textile composites: A comparative study of textile composites with different reinforcement architecture that shows the origins of non-linearity and the dependence of elastic parameters on the geometry of the unit cell; (2) Impact behavior of textile composites: The role of textile architecture in impact energy absorption; (3) Ballistic properties of ceramic sphere composites with textile composite backings.; A detailed study of a new gradient design concept is presented using a full finite element discretization method that shows that although ceramic spheres embedded in epoxy exhibit a slightly lower energy absorption than the monolithic ceramic at the same areal density, they provide the advantage of ease of complex shape conformable manufacturing. A comparison with ballistic experiments on such material demonstrates that the analysis captures several aspects of this phenomenon.