CHARACTERIZING IN-SITU MATRIX PROPERTIES OF POLYMER COMPOSITES USING DIGITAL VOLUME CORRELATION (DVC) AND MODELING STATIC AND FATIGUE LOADING
Abstract
The mechanisms by which fatigue damage and degradation of stiffness occur in fiber reinforced polymer composites (FRPC) are dictated to a large extent by the cyclic response of the in-situ polymer matrix, specifically the stress-strain response of the matrix when subjected to fatigue loading, and details of the play stack-up, which also includes details of the fiber volume fraction and interface between plies. In this proposal, we present a novel multiscale approach to model fatigue in aerostructural composites based on the PIs past success on developing a multiscale modeling framework for the quasi-static damage and failure modeling of textile composites. The model to be developed is computationally efficient due to the utilization of a closed form solution for the sub-scale stress and strain states within the matrix captured via a reformulation of the composite cylinder model and referred to as the NCYL model. The NCYL model is coupled to a mesh-objective crack band model for capturing post-peak softening response in a discretization objective manner, and extended to model fatigue in FRPCs. The proposed work utilizes the digital volume correlation (DVC) method for collecting experimental data on damage progression, in-situ, due to cyclic loading, by conducting experiments within an available microCT scanner, thus acquiring data at the microscale in-situ. In addition, experiments are proposed utilizing angle-ply 450 composites subjected to fatigue loading in order to validate the proposed multiscale modeling framework.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2021
- Source ID
- FA95502010014
Entities
People
- Anthony Waas
Organizations
- Air Force Office of Scientific Research
- Board of Regents of the University of Michigan
- United States Air Force