Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 43, Issue 10, Pages 1630-1638Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2011.07.014
Keywords
Polymer-matrix composites; Micro-mechanics; Electron microscopy; Mechanical testing
Funding
- Ministerio de Ciencia e Innovacion de Espana [MAT 2009-14396]
- Comunidad de Madrid [S2009/MAT-1585]
- research project DEFCOM (Era-Net MATERA, EU, 6th FP)
- European Communitys [213371]
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Digital image correlation (DIC) is applied to analyzing the deformation mechanisms under transverse compression in a fiber-reinforced composite. To this end, compression tests in a direction perpendicular to the fibers were carried out inside a scanning electron microscope and secondary electron images obtained at different magnifications during the test. Optimum DIC parameters to resolve the displacement and strain field were computed from numerical simulations of a model composite and they were applied to micrographs obtained at different magnifications (250x, 2000x, and 6000x). It is shown that DIC of low-magnification micrographs was able to capture the long range fluctuations in strain due to the presence of matrix-rich and fiber-rich zones, responsible for the onset of damage. At higher magnification, the strain fields obtained with DIC qualitatively reproduce the non-homogeneous deformation pattern due to the presence of stiff fibers dispersed in a compliant matrix and provide accurate results of the average composite strain. However, comparison with finite element simulations revealed that DIC was not able to accurately capture the average strain in each phase. (C) 2011 Elsevier Ltd. All rights reserved.
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