Introduction

This example demonstrates the effects of through-the-thickness mesh density, finite element type, and failure criteria type on the progressive failure response of the composite structure. In a typical composite structure, catastrophic global structural failure is precipitated by the onset and subsequent growth (or spreading) of localized matrix and fiber constituent failures. Consequently, three different types of failure are discussed in this example problem.

1. Local Failure (failure at a Gaussian integration point):
   • Matrix Constituent Failure
   • Fiber Constituent Failure
2. Global Failure (significant, discrete reduction in global stiffness of the structure):

   This example problem involves imposing a set of quasi-static monotonically increasing loads on a large composite structure. The overall response of the composite structure to these applied loads is characterized by the displacement at certain points on the structure. Global structural failure is identified by the appearance of a significant discontinuity in the structure's load/displacement relationship indicating a large decrease in the overall stiffness of the structure.

The input files used in this example problem are available for download here.