In this investigation,the fracture loads,absorbed energy of fracture,the displacement of application points of the loads,and the lengths of fiber cracks on fracture surfaces are measured in COD,four-point bending (4 PB),charpy V and three-point notch bending (3 NB) specimens of C-Mn steed and weld metal tested at the brittle-ductile transition temperature region.
测量了试样断裂载荷、吸收功、加载点位移和断口上纤维裂纹长度,得到了纤维裂纹扩展速度及其前端标称应力随其长度的变化。
Some specimens fracture after fiber cracks occurre and extend to various lengths and some specimens are unloaded prior to fracture.
对C-Mn钢和焊缝金属的COD,4PB,Charpy V和3NB试样在韧-脆转变温度区产生不同纤维裂纹长度后的断裂进行了卸载试验。
The characterofresource of serpentine fibrein China, and the new progressing on environmental mineral-medicine science have been discussed in thispaper, then theauthor advanced a new point of view on changing evaluation index system ofsafety utilization of serpentine fibre.
论述了中国蛇纹石纤维资源特征、资源环境和蛇纹石纤维环境矿物医学研究的新进展,并据此对蛇纹石纤维安全评价的指标体系更新提出了新的观点。