The evolutional law of damage variable as a function of stress was obtained.

并得出了损伤变量分别随应力和应变而变化的规律。

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According to principle of damage mechanics, the evolutional law of damage in pearlite ductile cast iron has been studied under fatigue and tension loading.

利用损伤力学原理，研究了珠光体球墨铸铁在疲劳和拉伸载荷作用下的损伤演变规律。

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Beginning with studying consumers' channel preference and purchasing guideline, we can cognize and grasp the evolutional law of retail terminal commercial mode for finding out a way to promote retail.

要从研究消费者渠道偏好与购买准则入手，认识与把握零售终端商业模式的演进规律，找到零售终端策略的改进思路。

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