Effect of strain rate at compressive and tensile loading of unidirectional plies in structural composites
Paper in proceedings, 2019

Fibre-reinforced polymer composites are widely used in structural applications due to their high specific stiffness and strength. In some applications the response of dynamically loaded composite components must be analysed. For example, in crash analyses of structural components, where very high loading rates occurs, the composite behaviour is not fully understood. For this, we present a novel transversely isotropic viscoelastic-viscoplastic constitutive model for a unidirectional carbon-epoxy composite. The model is micromechanically motivated so that the matrix and fibre materials of the composite are treated as micromechanical constituents at the ply scale. Based on the Hill-Mandel condition, the phases are homogenized via the macroscopic and fluctuating strain fields. To arrive at a simple but still representative model, a simplistic ansatz is applied to the structure of the fluctuating strains leading to a non-standard homogenized response of the composite. The model is applied to the non-linear rate dependent anisotropic ply behaviour under quasi-static and dynamic loading at different off-axis angles. For a simple viscoelastic-viscoplastic prototype for the rate dependent matrix response, there is a good correlation between measured and model response of the IM7-8552 material system in compression and tension.

Unidirectional composites

Strain rate effects

Constitutive model

Author

Vivekendra Singh

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Ragnar Larsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Erik Marklund

Swerea SICOMP

Robin Olsson

Swerea SICOMP

PROCEEDINGS - 7th ECCOMAS THEMATIC CONFERENCE ON THE MECHANICAL RESPONSE OF COMPOSITES

7th ECCOMAS Thematic Conference on the Mechanical Response of Composites
Girons, Spain,

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

More information

Latest update

3/16/2020