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EVALUATION OF J/CTOD FOR CLAMPED SE(T) SPECIMENS WITH WELDS

机译：焊缝夹紧SE（T）试样的J / CTOD评估

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摘要

In BS 7448, Part 2, the stress intensity factor, J-integral and crack tip opening displacement (CTOD) equations developed for evaluation of fracture toughness of a homogeneous material using experimentally measured quantities, such as load-load line displacement, are applied to SE(B) specimens with yield-strength-mismatched welds. The accuracy of this procedure was studied by Gordon and Wang using finite element analysis (FEA). Recently, the so-called "η factor" method for J-integral evaluation of SE(T) specimens with weld-center-line-cracked and yield-strength-mismatched welds was studied by Ruggieri using detailed FEA calculations and the load separation method proposed by Paris et al. For application to strain-based design of pipelines, CANMET has developed equations to evaluate J-integral and CTOD resistance curves for clamped SE(T) specimens of homogeneous materials using experimentally measured load and crack-mouth-opening displacement (CMOD) in a single-specimen procedure similar to that in ASTM E1820. In the present study, the accuracy of using these equations for J-integral evaluation of clamped SE(T) specimens with weld-center-line-cracked and strength-mismatched welds was studied. It was found that the errors in J and CTOD using the equations developed for SE(T) specimens of homogenous materials for these strength-mismatched welds are similar to those for SE(B) specimens with the same weld geometry and mismatch level as reported by Gordon and Wang. It was also found that using the higher of the strength of base and weld metals σ_Y (= (σ_(YS) + σ_(TS))/2), (i.e. (σ_Y)_w for overmatching and (σ_Y)_b for undermatching) in converting J to CTOD gives reasonable and conservative CTOD evaluations for specimens with weld-center-line-cracked and yield-strength-mismatched welds.
机译：在BS 7448第2部分中，将应力强度因子，J积分和裂纹尖端张开位移（CTOD）公式用于评估均质材料的断裂韧性，这些公式是使用实验测量的量（例如载荷-载荷线位移）来评估的。 SE（B）标本具有屈服强度不匹配的焊缝。 Gordon和Wang使用有限元分析（FEA）研究了此过程的准确性。最近，Ruggieri使用详细的FEA计算和载荷分离方法研究了所谓的“η因子”方法，该方法通过焊接中心线裂纹和屈服强度不匹配的焊缝对SE（T）标本进行J整体评估巴黎等人提出。为了应用在基于应变的管道设计中，CANMET开发了方程式，可使用实验测量的载荷和裂纹口张开位移（CMOD）来评估均质材料的夹紧SE（T）标本的J积分和CTOD电阻曲线-样本程序类似于ASTM E1820中的程序。在本研究中，研究了使用这些方程式对带有焊接中心线裂纹和强度不匹配焊缝的SE（T）试样进行J积分评估的准确性。我们发现，对于这些强度不匹配的焊缝，使用为均质材料的SE（T）试件开发的方程对J和CTOD的误差与具有相同焊缝几何形状和不匹配水平的SE（B）试件的误差相似，与戈登和王。还发现使用较高的母材和焊缝金属强度σ_Y（=（σ_（YS）+σ_（TS））/ 2），（即（σ_Y）_w表示过度匹配，而（σ_Y）_b表示不匹配）将J转换为CTOD时，对于带有焊缝中心线裂纹和屈服强度不匹配的焊缝的试样，可以给出合理而保守的CTOD评估。

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