Asymmetric behaviour of fibrous metal matrix composites

Citation
Mm. Aghdam et al., Asymmetric behaviour of fibrous metal matrix composites, MATER SCI T, 17(9), 2001, pp. 1153-1157
Citations number
28
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS SCIENCE AND TECHNOLOGY
ISSN journal
02670836 → ACNP
Volume
17
Issue
9
Year of publication
2001
Pages
1153 - 1157
Database
ISI
SICI code
0267-0836(200109)17:9<1153:ABOFMM>2.0.ZU;2-0
Abstract
Experimental investigations have illustrated that unidirectional metal matr ix composites (MMCs) show asymmetric behaviour under uniaxial tensile and c ompressive loading. This asymmetry occurs when the material is loaded along the fibre direction and also when loaded in the transverse direction. In t his paper, results from finite element micromechanical models are presented . The models were used to study the asymmetric behaviour of unidirectional fibre reinforced MMCs subjected to longitudinal and transverse loading. The effects of the thermal residual stresses arising from the manufacturing pr ocess were included in the study. Also, the influence of the degree of bond ing of fibre to matrix was examined, from perfectly bonded to completely de bonded. Results reveal that thermal residual stresses are responsible for t he asymmetric behaviour of the MMCs in the longitudinal direction. In trans verse loading, both the degree of interface bonding and residual stresses a ccount for the asymmetric behaviour. The predicted stress - strain response of the M M C shows good agreement with the available experimental data for both both tensile and compressive loading. Results also suggest that in or der to predict accurately the yielding behaviour of MMCs, the current symme tric yield criteria require modification.