这个关系的重要性在于提供高的屈服和拉伸强度。
The significance of this relationship is providing for high yield and tensile strengths.
研究进一步表明，材料变形的难易程度又与变温循环过程，热疲劳试样拉伸应力的增加和材料屈服强度的降低有关。
Moreover, it is revealed that the deformation resistance in the thermal cycle process is related to the increase of its tensile stress and the decrease of yield strength.
结果表明：PVC的拉伸屈服强度随外力作用速度的提高而提高，断裂伸长率却随之下降。
The results showed that with the the increase of outside force velocity, the tension yield strength of PVC increased, but its breaking elongation decreased.
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