Consequently, at the macroscopic crack branching velocity, the experimental fracturesurfaceenergy and the fracturesurface roughness; have no single value in such materials.
因此，对这种材料在宏观裂纹分叉速度时，实验断裂表面能及断裂表面韧性没有单一值。
2
The fractureenergy GF of concrete is one basic material characteristic, representing the energy necessary to create a unit area of fracturesurface.
混凝土断裂能G _ F是材料的一个基本性能，表示扩展单位裂缝面所需要的能量。
3
In the case of the limited level density of the material surfaceenergy, the fracture stress and the calculation formula of the engineering damage were studied.