Abstract
Plain woven composites have been found to exhibit significant creep at ambient and various elevated temperatures with low to medium stress levels. One effective means to improve the creep resistance of woven composites is to introduce through-thickness stitching. Experiments were conducted using specimens stitched with different threads at various densities. The results showed that stitching can significantly reduce delamination and hence enhance creep resistance, provided the stitches are aligned in the direction of loading. The effectiveness of stitching was found to increase with stitch density and thread modulus. To provide an engineering method for correlating the experimental results, the Findley equation was employed for stage I creep, Norton's law and the Four Element Model were employed for stage II creep; good agreement between the experimental data and the models have been observed.
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