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Estimation of C-t for weld cracks including HAZ softening region

机译：包括HAZ软化区域在内的焊缝裂纹的C-t估计

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摘要

C-t is an important parameter in predicting creep crack growth life from the small-scale creep stage to the extensive steady state creep stage. In this paper, weld interface and non-interface creep cracks for compact tension (CT) specimens with heat-affected zone (HAZ) were studied by finite element method (FEM) to systematically research the estimation method of C-t for weld creep cracks. Simulation results showed that C-t of weld interface cracks could be estimated by Yoon's method. For weld non-interface cracks, C-t under the small-scale and transition creep stages could be exactly estimated by a proposed method. The accuracy of the proposed method was not affected by HAZ, but Yoon's method was slightly affected by HAZ.
机译：C-t是预测从小尺寸蠕变阶段到广泛稳态蠕变阶段的蠕变裂纹扩展寿命的重要参数。本文通过有限元方法（FEM）研究了热影响区（HAZ）的紧凑拉伸（CT）试件的焊接界面和非界面蠕变裂纹，系统地研究了焊接蠕变裂纹C-t的估算方法。仿真结果表明，采用Yoon方法可以估算出焊接界面裂纹的Ct。对于焊缝非界面裂纹，可以通过提出的方法精确估计小尺度和过渡蠕变阶段下的C-t。所提出的方法的准确性不受热影响区的影响，但尹的方法受热影响区的影响很小。

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