摘要
综述了按GB/T 8363与API RP 5L3等标准所执行的铁素体钢落锤撕裂试验(DWTT)技术的发展概况及其在评价高强度、高韧性金属材料动态断裂性能,特别是在韧断止裂性能中的应用,如高等级管线钢、压力容器用钢以及高止裂性能船板用钢等。具体而言,第一代DWTT试验机具有较高打击能量冲断试样暴露断裂面,仅用于评价设定温度断口剪切面积分数pSA指标;第二代试验机可实测试样的DWTT吸收能,是夏比冲击技术在大尺寸试样与实物性能评测中的重要拓展;第三代试验机具备仪器化测力分析功能,可结合弹塑性断裂力学原理开展动态断裂性能评价,特别是评估管线钢的临界裂纹尖端张开角度指标,即ψCTOA,c。
The technical development of drop-weight tearing test （DWTT）, complying with the standards of GB/T 8363 and AP1 RP 5L3 etc. was reviewed, together with the introduction of its application in evaluation of the dynamic fracture toughness, especially the material resistance to ductile fracture for high strength and high toughness materials like high-grade pipeline steels, pressure vessel steels and ship steels with excellent crack arrest performance. In summary, The first generation DWTT machine with high impact energy is capable of breaking the specimen to rate the percentage of shear area （psA） on the fracture surface. The second generation machine is able to measure the DWTT energy absorbed by the DWTT speciemen, as an alternative to the conventional Charpy impact, when dealing with the large-scare or rea[-si.ze samples. The third generation machine is equipped with the instrumented impact functionality for further analysis on the dynamic fracture toughness of materials, on the basis of elastic-plastic fracture mechanics, especially providing a way to estimate the critical crack tip openning angle （φCTOA,c） for pipeline steels.
出处
《理化检验（物理分册）》
CAS
2015年第6期381-387,393,共8页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
落锤撕裂试验
管线钢
韧断止裂性能
裂纹尖端张开角度
drop-weight tearing test
pipeline steel
resistance to ductile fracture
crack tip openning angle
