Sage Journals: Discover world-class research

Abstract

This paper is concerned with the study of elasto-plastic deformation of the coating, and consequently, the changes in the states of stress in the constituent phases of a unidirectional fiber reinforced polymer matrix composite (PMC) under uniform thermal, hygral and hygrothermal loadings. A four-phase composite cylinder assemblage (CCA) model has been used for the analysis. The coating interphase between the fiber and the matrix has been taken to be of lower modulus and lower yield stress value than that of the matrix. Only those combinations of temperature and moisture content are considered which give rise to plastic deformation in the coating, other phases still remaining elastic. Plastic behaviour of the coating has been idealized by taking a linear work-hardening constitutive relation.

Keywords

hygrothermal effect fiber coating coating deformation plastic relaxation of coating polymer-matrix composite stresses in fiber coatings

Get full access to this article

View all access options for this article.

References

1. Adams, D. F. and A. K. Miller . 1977. "Hygrothermal Microstresses in a Unidirectional Composite Exhibiting Inelastic Material Behaviour," Journal of Composite Materials, 11:285-299.

2. Miller, A. K. and D. F. Adams . 1978. "Inelastic Micromechanical Analysis of Graphite/Epoxy Composite Subjected to Hygrothermal Cycling," Advanced Composite Materials Environmental Effects. ASTM STP 658, J. R. Vinson , Ed., American Society for Testing and Materials, pp. 121-142.

3. Adams, D. F. 1987. "A Micromechanics Analysis of the Influence of the Interface on the Performance of Polymer-Matrix Composites," Journal of Reinforced Plastics and Composites, 6:66-68.

4. Upadhyay, P. C. and J. Prucz . 1992. "Parametric Damage Modelling of Composites Due to Moisture Absorption," Journal of Reinforced Plastics and Composites, 1 1: 198-210.

5. Upadhyay, P. C. , K. Gurumurthy and D. W. Lyons . 1996. "Stress Field in Coated Continuous Fiber-Reinforced Polymeric Composite Due to Hygrothermal Loading," Journal of Reinforced Plastics and Composites, 15:619-650.

6. Hahn, T. A. 1993. "Thermal Stress Relaxation Due to Plastic Flow in the Fiber Coating of a Continuous Fiber Reinforced Composite," Journal of Composite Materials, 27:1545-1577.

7. Mikita, Y. and M. Taya . 1985. "Stress Field in a Coated Continuous Fiber Composite Subjected to Thermo-Mechanical Loadings," Journal of Composite Materials, 19:554-578.

8. Cairs, D. S. and D. F. Adams . 1984. "Moisture and Thermal Expansion Properties of Unidirectional Composite Material and the Epoxy Matrix," Environmental Effects on Composite Materials, 2:300-316. George S. Springer, Ed., Dept. Of Aeronautics and Astronautics, University of Stanford.

9. Chamis, C. C. 1983. "Simplified Composite Micromechanics Equations for Hygral, Thermal and Mechanical Properties," NASA Technical Memorandum 83320, Prepared for the Thirty-eighth Annual Conference ofthe Society of the Plastics Industry (SPI), Reinforced Plastics/Composites Institute Houston, Texas, pp. 1-10.

Plastic Deformation of Fiber Coating in Polymer Matrix Composites under Hygrothermal Loading

Abstract

Keywords

Get full access to this article

References