This contributes to the increase of tensile strength and modulus of the graphite fibers.

微观结构的改善是石墨纤维抗拉强度和弹性模量提高的主要原因。

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Compared to the matrix resin, this nano hybrid resin has shown reduction of volume shrinkage 38% and increase of tensile strength 31%.

该纳米复合树脂与基体树脂相比较，体积收缩率降低38%，拉伸强度提高31%。

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Also, the crack extension time decreases with the increase of material creep index and the loading of overlying strata rock while it increases with the increase of tensile strength of roof rock.

断裂孕育时间随材料的蠕变指数、上覆岩层压力的增大而减小；裂隙扩展时间也随材料的蠕变指数、上覆岩层压力的增大而减小，但随岩石的抗拉强度增大而增加。

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