A micromechanics based model for rate dependent compression loaded unidirectional composites
Journal article, 2023

Strain-rate effects in a unidirectional non-crimp fabric carbon/epoxy composite are addressed. To allow for kink-band formation including strain-rate  effects and damage in such composites, the paper advances a recent model focused on compression loading at small off-axis angles. The model is based on computational \textit{homogenization} with a subscale represented by matrix and fibre constituents at finite deformation. The fibre constituent is assumed to be elastic transversely isotropic and the matrix is viscoelastic--viscoplastic with damage degradation. Novel model improvements of special importance to small off-axis loading relate to the \textit{isostress} formulation of the homogenized response in transverse shear. In this context, an enhanced homogenized elastic response is proposed based on Halpin--Tsai corrections to account for the nonuniform stress distribution on the microscale. The model captures the strongly rate sensitive kink-band formation due to localized matrix shearing and fibre rotation, confirming the experimentally observed increase in compressive strength for high strain rates.

Viscoelasticity--viscoplasticity

Non-linear behaviour

Structural composites

Material modelling

Damage mechanics

Author

Vivekendra Singh

RISE Research Institutes of Sweden

Ragnar Larsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Robin Olsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

RISE Research Institutes of Sweden

Erik Marklund

RISE Research Institutes of Sweden

Composites Science and Technology

0266-3538 (ISSN)

Vol. 232 109821

Driving Forces

Sustainable development

Subject Categories

Applied Mechanics

Other Materials Engineering

Composite Science and Engineering

Roots

Basic sciences

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

Areas of Advance

Materials Science

DOI

10.1016/j.compscitech.2022.109821

More information

Latest update

1/9/2023 3