This paper studies the relationship between the static toughness and fatigue failure firstly, then getting the damage formula expressed by toughness.
本文研究了材料的静力韧性与疲劳损伤之间的关系，并在此基础上得到用韧性表示的损伤表达式。
Material 's static toughness is the area of the stress-stain chart, which means the work absorbed before its break. It integrative reflects the strength and the ductility of the material.
材料的静力韧性是应力—应变图的面积，表示材料断裂前吸收的功，它综合反映了材料的强度和延性性能。
The dynamic fracture toughness of five groups ceramic were tested and the obtained results are 1.08-2.83 times of static results.
测试了五组陶瓷的动态断裂韧性，所测断裂韧性的动态结果是静态结果的1.08 ~ 2.83倍。
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