本文研究考虑损伤时材料的断裂应力，推导出了在表面能密度有限的情况下，损伤断裂应力的计算公式。
In the case of the limited level density of the material surface energy, the fracture stress and the calculation formula of the engineering damage were studied.
本文建立了准静态情况下I型裂纹的断裂准则，提出了新的表面能概念及其表达式。
This article establishes a fracture criterion of crack type I under quasi-state conditions and brings forward a new concept and an expression of surface energy.
实验结果证明，芳纶表面改性显著提高了其复合材料界面的粘结强度，相反却降低了其界面断裂能。
The results show that the interfacial adhesion strength increased noticeably for composites of active aramid fiber but the fracture energy of the interface decreased.
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