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Crack growth in fillet welded steel joints subjected to membrane and bending loading modes
Engineering Fracture Mechanics ( IF 4.7 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.engfracmech.2020.107190
Zbigniew Mikulski , Tom Lassen

Abstract The present paper presents the results from extensive studies of the fatigue damage evolution in fillet welded steel joints subjected to Constant Amplitude (CA) stress under membrane and bending loading modes. The welded joints in question are F class details (category 71) with plate thicknesses ranging from 25 to 32 mm. The steel quality is a medium strength carbon manganese steel. Crack growth histories for the shallow semi-elliptical shaped cracks emanating from the weld toe are obtained by an Alternating Current Potential Drop (ACPD) technique. These growth histories are presented in detail and modelled by Linear Elastic Facture Mechanics (LEFM). The calculations follow the recent recommendations found in rules and regulations based on different formats of the Paris law. The uncertainties related to a multiple cracks situation and the variability in the weld toe geometry are discussed. The measured crack growth was modelled from an initial crack depth of 0.1 mm to final fracture. The recommended rule-based parametric formulas for the Stress Intensity Factor Range (SIFR) for small surface cracks at the weld notch are examined and supplemented by results from finite element modelling. Recommendations are given on how to make decision regarding uncertainties related to a correct characterization of the local weld toe geometry and the crack coalescence. Finally, an attempt is made to capture the influence of the applied stress ratio R and the applicability of a threshold value for the SIFR is discussed.

中文翻译:

角焊钢接头在膜和弯曲载荷模式下的裂纹扩展

摘要 本文介绍了在膜和弯曲载荷模式下承受恒幅 (CA) 应力的角焊缝钢接头疲劳损伤演变的广泛研究结果。有问题的焊接接头为 F 级细部(71 类),板厚范围为 25 至 32 毫米。钢质为中等强度碳锰钢。从焊趾发出的浅半椭圆形裂纹的裂纹扩展历史是通过交流电势降 (ACPD) 技术获得的。这些增长历史由线性弹性加工力学 (LEFM) 详细介绍和建模。计算遵循最近在基于巴黎法律不同格式的规则和条例中发现的建议。讨论了与多裂纹情况相关的不确定性和焊趾几何形状的可变性。从初始裂纹深度 0.1 毫米到最终断裂,对测量的裂纹扩展进行建模。对焊缝缺口处小表面裂纹的应力强度因子范围 (SIFR) 推荐的基于规则的参数公式进行了检查,并通过有限元建模的结果进行了补充。给出了关于如何就与正确表征局部焊趾几何形状和裂纹合并相关的不确定性做出决定的建议。最后,尝试捕捉施加的应力比 R 的影响,并讨论了 SIFR 阈值的适用性。从初始裂纹深度 0.1 毫米到最终断裂,对测量的裂纹扩展进行建模。对焊缝缺口处小表面裂纹的应力强度因子范围 (SIFR) 推荐的基于规则的参数公式进行了检查,并通过有限元建模的结果进行了补充。给出了关于如何就与正确表征局部焊趾几何形状和裂纹合并相关的不确定性做出决定的建议。最后,尝试捕捉施加的应力比 R 的影响,并讨论了 SIFR 阈值的适用性。从初始裂纹深度 0.1 毫米到最终断裂,对测量的裂纹扩展进行建模。对焊缝缺口处小表面裂纹的应力强度因子范围 (SIFR) 推荐的基于规则的参数公式进行了检查,并通过有限元建模的结果进行了补充。给出了关于如何就与正确表征局部焊趾几何形状和裂纹合并相关的不确定性做出决定的建议。最后,尝试捕捉施加的应力比 R 的影响,并讨论了 SIFR 阈值的适用性。对焊缝缺口处小表面裂纹的应力强度因子范围 (SIFR) 推荐的基于规则的参数公式进行了检查,并通过有限元建模的结果进行了补充。给出了关于如何就与正确表征局部焊趾几何形状和裂纹合并相关的不确定性做出决定的建议。最后,尝试捕捉施加的应力比 R 的影响,并讨论了 SIFR 阈值的适用性。对焊缝缺口处小表面裂纹的应力强度因子范围 (SIFR) 推荐的基于规则的参数公式进行了检查,并通过有限元建模的结果进行了补充。给出了关于如何就与正确表征局部焊趾几何形状和裂纹合并相关的不确定性做出决定的建议。最后,尝试捕捉施加的应力比 R 的影响,并讨论了 SIFR 阈值的适用性。
更新日期:2020-08-01
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