Tensile tests are conducted on stitched and unstitched uniweave T300/QY9512 laminates (with a hole) in hygrothermal environment and normal environment. It is shown that in a normal environment stitching reduces the tensile strength of laminates and does not significantly alter the open-hole tensile strength. The hygrothermal environment has a beneficial effect on the tensile strength of laminates and open-hole laminates, especially of stitched specimens. It is also noted that stitching direction has no effect on the tensile properties.
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2.
Mouritz, A. P. and Cox, B. N. (2000). A Mechanistic Approach to the Properties of Stitched Laminates , Composites: Part A, 31(1): 1-27 .
3.
Liu, D. (January 1990). Delamination Resistance in Stitched and Unstitched Composite Plates Subjected to Impact Loading , Journal of Reinforced Plastics and Composites, 9: 147-155 .
4.
Chen, G. , Li, Z. N. and Kou, C. H. (2004). Finite Element Analysis of Low-velocity Impact Damage of Stitched Laminates , Journal of Reinforced Plastics and Composites, 23(9): 987-995 .
5.
Chou, T. W. (1992). Microstructural Design of Fiber Composites, Cambridge University Press, Cambridge .
