Identification of the material parameters of a unidirectional fiber composite using a micromodel
Identifikacija parametrov materiala enosmernega kompozita z uporabo mikromodela

english

2012

volume 46, issue 5

unidirectional fiber composite   non-linear behavior   optimization    identification    matrix work-hardening function   representative volume element    unit cell    micromodel 

Inštitut za kovinske materiale in tehnologije
(Obvezni izvod spletne publikacije)

The paper is focused on the identification of material parameters of the substituents of an unidirectional carbon-epoxy long-fiber-reinforced composite. Simple tensile tests using thin coupons with various fiber orientations were performed and force-displacement diagrams were obtained. A model of a unit cell is created in MSC.Marc. Fibers are considered to form a non-linear, elastic, transversely isotropic material and the matrix is considered to be an elasto-plastic isotropic material. The unit cell is loaded by a uniaxial stress up to the same level of loadings as the experimental samples. The sum of the squared differences of displacements between the numerically and experimentally obtained force-displacement diagrams is minimized within an identification process. The parameters of the linear relation between the Young's modulus of fibers and strain in the fiber-axis direction, and three shape coefficients of the matrix work-hardening function are searched. The identification process is performed using the MSC.Marc, OptiSlang optimization software and Matlab.

10.07.2013