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首页> 外文期刊>Journal of Materials Engineering and Performance >Evaluation of Plastic 'Eta' Factor for Welds of SS316L(N) with High Strength Mismatch Ratio
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Evaluation of Plastic 'Eta' Factor for Welds of SS316L(N) with High Strength Mismatch Ratio

机译：高强度不匹配比评价SS316L（N）焊缝焊缝的塑料“ETA”因子

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摘要

Fracture testing standards of ASTM and ISO recommend expressions for plastic factor of various fracture test specimen geometries to evaluate the fracture behavior of materials. These are intended for homogenous specimens, but according to ISO 15653, it can be extended for weldments up to a strength mismatch ratio (M) of 1.25. In practice, M1.25 is encountered in many applications. In the present study, factor has been evaluated for welded compact tension specimens using a limit load-based approach. The factors obtained using this approach for homogenous specimens with elastic-perfectly plastic material model are found to be within +/- 4% of those from the ASTM E 1820-17a, thereby validating the procedure. For welds, the limit load is obtained from nonlinear (elastic-plastic) FE simulations. factors for specimens with various crack lengths (a), weld width (h) and strength mismatch have been evaluated and found to be significantly influenced by these parameters. For M1.25, the estimated values were found to be similar to 16% lower compared to that from the ASTM E 1820-17a. Thus, the use of the values from the proposed method provides a conservative estimate of J-R curve for the welds. Further, it has been observed that depending on the slope of the blunting line, the J(Ic) value may vary significantly with the estimated values.
机译：ASTM的断裂试验标准和ISO建议各种骨折试样几何形状的塑料因子表达式，以评估材料的骨折行为。这些旨在用于均匀的标本，但根据ISO 15653，可以将焊接延伸至强度不匹配比（M）为1.25。在实践中，在许多应用中遇到了m＆ 1.25。在本研究中，使用基于极限的载荷的方法对焊接紧凑张力标本进行评估。发现使用这种具有弹性塑料材料模型的均匀样品获得的因素，从ASTM E 1820-17A的+/- 4％内，从而验证程序。对于焊接，极限载荷是从非线性（弹性塑料）FE模拟中的。已经评估了各种裂缝长度（a），焊接宽度（h）和强度错配的标本因素，并发现受这些参数的显着影响。对于m＆ 1.25，发现估计值与来自ASTM E 1820-17A相比的比较相比降低了16％。因此，从所提出的方法中使用值提供了焊缝的J-R曲线的保守估计。此外，已经观察到，根据Blunting线的斜率，J（IC）值可以随着估计值而显着变化。

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