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Abstract

Effects of hygrothermal conditions on the large deflection bending of asymmetric PMC laminates have been studied for the case of cylindrical bending, with two different stacking sequences of the laminae. The results are compared to those from linear theory. The hygrothermal effect is incorporated in the present analysis by adjusting the stiffness coefficients of the laminate according to its level of moisture concentration and temperature, using the empirical relations of Chamis [5]. A glass/epoxy composite system is chosen for the study, but similar results may be expected for other PMC systems also. Changes in the stiffness coefficients of a laminate, due to hygrothermal conditioning, do not appear to affect the large deflection results as significantly as in the case of linear analysis.

Keywords

hygrothermal effect asymmetric laminates large deflection bending glass-epoxy laminates

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References

1. Whitney, J. M. and A. W. Leissa . 1969. "Analysis of Heterogeneous Anisotropic Plates," Journal of Applied Mechanics, 36: 261-266.

2. Sun, C. T. and H. Chin . 1988. "Analysis of Asymmetric Composite Laminates," AIAA Journal, 26: 714-718.

3. Sun, C. T. and H. Chin . 1988. "On Large Deflection Effects in Unsymmetric Cross-ply Composite Laminates," Journal of Composite Materials, 2: 1045-1059.

4. Whitney, J. M. 1969. "Bending-Extension Coupling in Laminated Plates Under Transverse Loading," Journal of Composite Materials, 3: 20-28.

5. 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 of the Society of the Plastics Industry (SPI), Reinforced Plastics/Composites Institute, Houston, TX, pp. 1-10.

6. Cairns, D. S. and D. F. Adams , 1984. "Moisture and Thermal Expansion Properties of Unidirectional Composite Materials and the Epoxy Matrix," Environmental Effects on Composite Materials, Vol. 2, George S. Springer , Ed., pp. 300-316.

Hygrothermal Effect on the Large Deflection Bending of Asymmetric PMC Laminates

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