Open AccessExploration of irreversible residual stresses in a carbon/epoxy composite
Author(s) -
Johnny Jakobsen,
Fahimeh Shakibapour
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/942/1/012018
Subject(s) - materials science , composite material , shrinkage , epoxy , residual stress , composite number , carbon fibers , matrix (chemical analysis) , thermal , residual , thermodynamics , algorithm , computer science , physics
Residual stresses in composite material may rise from several sources; difference in thermal straining between fibre and matrix, chemical shrinkage of the matrix material. The presented paper explores an irreversible Eigen-strain in the material which is shown to change and be removed by a thermal treatment above the Tg of the matrix material. This has been observed though TMA measurements of a carbon/epoxy unidirectional sample. The local Eigen-strain is translated into stresses using a visco-elastic constitutive relation. Further exploration indicates that cooling rate influence the generation of residual stresses in the material.