  This project is focused on developing an experimental framework for
characterizing non-associative plasticity flow rule coefficients through
coupon-scale tests for the LS-DYNA MAT213 model. The main objective is to
characterize these coefficients based on the multi-scale (i.e., both
microscopic and macroscopic) full-field measurement of the evolution of strain
and stress fields. This paper focuses on presenting the experimental work on
characterizing the full-scale stress-strain curves of T700/LM-PAEK composites
under tension, compression, and shear loads. The experimental data set was
intended to build a deformation sub-model in the MAT213 model for the material.
The strain data were collected using both microscopic and macroscopic digital
image correlation techniques. The microscopic technique was particularly useful
for fracture cases under small strains. A preliminary simulation result
obtained from the MAT213 model is also presented in the paper. The experimental
framework herein will be extended to characterize post-peak stress degradation
in the composite material and to develop a damage sub-model for the material.
This project will contribute to developing a simulation tool based on the
MAT213 model for simulating the rate-dependent impact damages in composites
under multi-axial loading.
