章传国
,
杨建强
,
郑磊
,
谢仕强
钢铁
采用4点弯曲试样,对X65钢级UOE焊管焊缝接头进行NACE0177标准规定的SSCC(Sulfur Stress Corrosion Cracking,硫化物应力腐蚀开裂)试验,并采用应变计法完成目标应力加载.结果表明,通过应变计法可以有效地建立FPB(Four Point Bent,4点弯曲)试样加载应变-载荷-应力关系,并根据该关系准确确定目标加载应变量,从而实现目标应力的准确加载.采用该方法完成试验试样90％实际屈服强度的应力加载,并经H2S环境溶液浸泡720h后表面未见裂纹,试验材料表现出优异的抗硫化物应力腐蚀开裂性能.
关键词:
SSCC
,
4点弯曲
,
应变计
,
加载应力
LIN Junshan YAN Wenbin TU Mingjing Xi'an Jiaotong University
,
Xi'an
,
China
金属学报(英文版)
The method to detect the crack initiation point of Charpy pre-cracked specimen under dy- namie loading was studied using strain gauge.The load-time curve and nominal strain-time curve at the crack tip for impact testing specinens may be shnultaneously measured by twin-channel oscilloscope with high speed sampling and diskette storing.Based on the dynam- ic finite element simulation of impact response of Charpy specimen,the measuring method of dynamic fracture toughness was analysed and some problems in previous dynamic fracture toughness measurement were discussed.
关键词:
crack initiation point
,
null
,
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