A Hybrid Approach to Composite Damage and Failure Analysis Combining Synergistic Damage Mechanics and Peridynamics
Abstract
Manufacturing of polymer matrix composites (PMCs) results in disordered fiber distributions and defects such as voids in the matrix. We focus in this task on the local stress states in the matrix that become triaxial under any remotely applied stresses resulting from the service environment in which a given composite structure operates. The local stress states are responsible for the precursor mechanisms that initiate cracks. This task studies the point-failure processes that become critical under favorable energy conditions. The two basic energy-driven processes are cavitation and shear-band formation in polymers. The former is governed by the dilatation energy density, while the latter requires energy of distortion for its initiation. The work conducted in the reporting period has focused on cavitation resulting in regions of fiber clusters, where favorable conditions for cavitation are likely. The remote loading considered in this work is tension normal to fibers (so-called transverse tension). The work performed in the reporting period has been focused on continuation of Task 1.1, and initial work on Task 2.2 and Task 2.-1, as described in the project proposal. The activities related to Task 1.1 are construction of a representative volume element (RVE) containing disordered fiber distributions, simulating manufacturing effects, and its computational micromechanics failure analysis. Task 2.2 is concerned with RVE level modeling by peridynamics and Task 2.4 addresses fatigue damage with peridynamics. Initial results for all tasks are reported and the ongoing work is outlined.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 2016
- Accession Number
- AD1011194
Entities
People
- Florin Bobaru
- Ramesh Talreja
Organizations
- Texas Engineering Experiment Station