The fracture dynamics is always the hot point of the research of the fracture mechanics, and the study on the crack is especially so.

断裂动力学的研究一直是断裂力学中的一个热点，裂纹问题更是其中的一个热点所在。

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Fracture of engineering site is one of the main disaster under the environment of the regional instability dynamics. At present, it still lacks systematical research.

工程场地破裂灾害是区域非稳定动力学环境下的灾害效应之一，但目前对其尚无针对性系统研究。

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Only, a dynamics model of bridging fiber is built, fracture dynamics problems of composite materials are solved very well.

只有建立复合材料的桥连动力学模型，才能更好地研究复合材料的断裂动力学问题。

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