摘要
依据ASTM用于CT试样获取断裂韧度载荷分离理论规则化方法提出量纲一载荷分离法,从而完善用于断裂韧度测试的载荷分离理论,且根据弹塑性有限元精细计算结果以及直通型CT变形几何关系,提出裂纹嘴张开位移与加载线位移的转换公式。采用不同初始裂纹长度CT钝裂纹试样对公式的有效性和精确性进行试验验证,进而实现对1Cr12Mo、30Cr2Ni4Mo V以及P91管材10Cr9Mo1VNb N三种合金直通型CT试样的JR阻力曲线测定,结果表明,试验值与公式计算值的最大相对误差均在5%以内。
Systematic investigation on the estimation of J resistance curves for straight-notch CT specimens was carried out on the basis of normalization method which concludes in the non-dimensional load separation method.Improvements on the load separation principle were performed.In the light of refined finite element analyses and the geometry deformation relationship of straight-notch CT specimen,a transforming formula from crack mouth opening displacement （V0） to load line displacement （VLL） was proposed.Blunt cracked CT specimens with different initial crack length were used to test and verify the transforming formula.Three types of engineering materials,such as 1Cr12Mo,30Cr2Ni4MoV and 10Cr9Mo1VNbN,were employed to estimate the J-resistance curves.The results show that the errors between the experimental and calculated values are all less than 5％.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2014年第6期67-74,共8页
Journal of Aeronautical Materials
基金
国家自然科学基金(11072205)
中央高校基本科研业务费专项资金(SWJTU11CX066)
关键词
载荷分离法
量纲相似
直通型CT试样
有限元分析
V0-VLL换算
断裂韧度
J阻力曲线
load separation method
dimensionless principle
straight-notch CT specimen
finite element analysis
VO-VLL transformation
fracture toughness
J resistance curve
