consequently, at the macroscopic crack branching velocity, the experimental fracture surface energy and the fracture surface 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。
the brittle fracture surface energy for a number of bcc and fcc metals has been calculated and the results coincide with order of magnitude in experimental measurements.