[SY-J1] A multiscale failure analysis for layered composites with statistical account of manufacturing defects
Invited
As composite materials have broadened in their applications from aerospace to automotive and energy industries, their cost-effectiveness has become critical. Since in most cases, a major cost lies in the manufacturing process, the effects of defects on performance has gained renewed attention. Traditional failure analysis has either not considered effects explicitly or has accounted by these in artificial ways. The work to be presented develops a statistical simulation of manufacturing defects such as nonuniform fiber distribution within the matrix by quantifying deviations from uniformity based on fiber mobility during the manufacturing process. Algorithms are implemented to generate representation of the “real” microstructure with quantified anomalies. The representative volume element realizations are subjected to boundary conditions under which the local stress fields are computed. A hierarchical energy based set of failure criteria are used to determine occurrence of the sequence of failure events and their progression. By parametric studies, the effects of defects as well as constituent properties on failure behavior under different loading conditions is clarified.