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首页> 外文会议>International Conference on Structural Integrity and Fracture, SIF 2002, Sep 25-27, 2002, Perth, Australia >Study on correlation of the fracture toughness and microshear toughness for pressure vessel steels and structural steels
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Study on correlation of the fracture toughness and microshear toughness for pressure vessel steels and structural steels

机译：压力容器钢和结构钢的断裂韧性与微剪切韧性的相关性研究

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In this paper, the mioroshear toughness, mode Ⅰ and mode Ⅱ fracture toughness, and their relationships were characterized for a number of pressure vessel steels and structural steels with the yield-strength-grade in the range of 300 to 1100 MPa, by a unique microshear experiment method and three-point bending as well as asymmetric four-point bending fracture mechanics tests combining FE analysis. The influences of microstructural orientation or anisotropy of materials on mode Ⅰ and Ⅱ fracture toughness as well as the microshear toughness were investigated. Results show that the orientation and anisotropy of materials have much less influence on mode Ⅱ fracture toughness than mode Ⅰ fracture toughness. For most materials tested in both L-T and T-L orientations, J_(IC) values are larger than J_(IIC) values. The ratios of J_(IIC)/J_(IC) in the T-L direction are always larger than that in the L-T direction. There exists a linear correlation between the normalised mode Ⅱ fracture toughness J_(IIC) and microshear toughness W_s. However, an accurate correlation between the mode Ⅰ fracture toughness and the microshear toughness has not been established. It can be seen that the mode Ⅱ fracture toughness estimated by the correlation equation between the normalised J_(IIC) and W_s is very close to the experimental results. It is expected that the microshear test may be used to estimate the mode Ⅱ fracture toughness of structures, including welded structures, in addition to its use for estimation and monitoring of conventional mechanical properties.
机译：本文对屈服强度等级为300至1100 MPa的多种压力容器钢和结构钢的微剪切强度，Ⅰ型和Ⅱ型断裂韧性及其关系进行了表征。微剪切实验方法和三点弯曲以及不对称四点弯曲断裂力学测试结合有限元分析。研究了材料的微观结构取向或各向异性对Ⅰ，Ⅱ型断裂韧性以及微剪切韧性的影响。结果表明，材料的取向和各向异性对Ⅱ型断裂韧性的影响远小于Ⅰ型断裂韧性。对于大多数在L-T和T-L方向上测试的材料，J_（IC）值都大于J_（IIC）值。 J_（IIC）/ J_（IC）在T-L方向上的比率始终大于在L-T方向上的比率。归一化Ⅱ型断裂韧度J_（IIC）与微剪切韧度W_s之间存在线性关系。但是，尚未确定Ⅰ型断裂韧性与微剪切韧性之间的精确关联。可以看出，用归一化的J_（IIC）和W_s之间的相关方程估算的Ⅱ型断裂韧性与实验结果非常接近。可以预期的是，微剪切试验除了可以用于评估和监测常规机械性能外，还可以用于评估结构（包括焊接结构）的Ⅱ型断裂韧性。

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