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An engineering method for constraint based fracture assessment of welded structural components with surface cracks

机译：基于约束的焊接结构构件表面裂纹断裂评估的工程方法

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In this study it has been shown that accurate descriptions of crack-tip stress-fields in surface cracked welded plates can be obtained without large 3D FEA models. When a fracture mechanics FE analysis is required in a large construction, existing shell models can be used in combination with a plane strain submodel. The 2D plane strain model is driven by displacements from the global shell model. This technique has been used to simulate crack-tip stress-fields in a surface cracked plate. Thecrack-tip stress fields are characterised with the J-integral and the constraint parameter, Q. The crack in the global shell model was simulated with line-spring elements. The global behaviour as well as the crack-tip stress-fields of the plane strainsubmodel have been compared to a 3D solid model. Initially. the crack-tip stress-fields in the plane strain model and the 3fl model with surface crack were compared, using the same In plane mesh and element type. It was found that when first orderelements were used, the constraint was higher in 3D than in plane strain. For second order elements, however, the trend was the opposite. By using a correction factor for the load, the load vs. J behaviour and the crack-tip stress-fields of a surfacecracked plate can be predicted from a shell analysis with line-spring elements and a plane strain model. Accurate predictions of J and Q were obtained using the shell + submodel technique for homogeneous material and for a weldment with fusion line crack. The shell + submodelling technique was used to assess brittle fracture in two steel weldments with a surface crack using the RKR failure criterion by Ritchie et al. [16]. For the investigated case, the toughness requirements could he relaxed significantly based on the two parameter analysis compared to conventional fracture mechanics analyses.
机译：在这项研究中，已经表明，无需大型3D FEA模型即可获得表面裂纹焊接板中裂纹尖端应力场的准确描述。当大型结构需要进行断裂力学有限元分析时，可以将现有的壳模型与平面应变子模型结合使用。二维平面应变模型由整体壳模型的位移驱动。该技术已用于模拟表面裂纹板中的裂纹尖端应力场。裂纹尖端的应力场用J积分和约束参数Q来表征。整体壳模型中的裂纹是使用线弹簧元素模拟的。平面应变子模型的整体行为以及裂纹尖端应力场已与3D实体模型进行了比较。原来。在平面应变模型和具有表面裂纹的3fl模型中，使用相同的In平面网格和单元类型比较了裂纹尖端的应力场。发现使用第一阶元素时，在3D中的约束比在平面应变中的约束高。但是，对于二阶元素，趋势却相反。通过使用载荷的校正因子，可以通过使用线弹簧元素和平面应变模型进行的壳体分析来预测表面裂纹板的载荷与J行为以及裂纹尖端应力场。使用Shell +子模型技术获得均质材料和带有熔合线裂纹的焊件的J和Q的准确预测。使用Ritchie等人的RKR破坏准则，采用壳+亚模型技术评估了两个具有表面裂纹的钢焊件的脆性断裂。 [16]。对于所研究的情况，与常规断裂力学分析相比，基于两个参数的分析，可以大大放松其韧性要求。

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