detail fracture of rail head轨头微细波纹;轨头微细裂纹

fracture detail断口

silky fracture detail丝光断口

fibrous fracture detail纤维裂痕

shear fracture detail切变断口

silvery fracture detail银白色断面

fatigue fracture detail疲劳折断

perforating fracture detail穿破骨折

brittle fracture detail脆性破坏

tight fracture detail紧密裂隙