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Damage concept for evaluating ductile cracking of steel structure subjected to large-scale cyclic straining

机译：评估大型循环应变下钢结构延性开裂的损伤概念

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Evaluation of ductile crack initiation in steel welded structures subjected to seismic loading is crucial for structural design or safety assessment to prevent brittle fracture induced by ductile cracking. Observation of ductile crack initiation behavior of round-bar specimens with/without circumferential notches tested in single tension revealed that the main controlling factor for ductile cracking in the employed two-phase steel is not growth of voids induced by large inclusions, but nucleation of micro-voids in a soft phase (Ferrite phase) near the Ferrite-Pearlite interface after large-scale plastic straining. The material damage concept under reverse loading, which correlates the material damage for micro-void nucleation to macro-scale mechanical parameters, was proposed in consideration of two aspects of the Bauschinger effect: (a) a mechanical aspect which influences deformation and stress/strain behaviors in steel structures, (b) a material damage aspect caused by dislocation behavior. A new criterion for ductile cracking of structural members under cyclic loading was proposed on the basis of the proposed effective damage concept and 'two-parameter criterion,' which can be applied to the steel structures under increasing load in a single direction. The validity of the advanced two-parameter criterion was verified by subjecting round-bar specimens to cyclic loading tests along the axial direction and cross-shaped specimens to cyclic 3-point bending tests. Consequently, the advanced two-parameter ductile cracking criterion was found to be a transferable criterion for evaluation of critical loading cycle of structural members from small-scale tensile test results.
机译：评估钢焊接结构中承受地震载荷的延性裂纹萌生对于结构设计或安全性评估至关重要，以防止延性裂纹引起的脆性断裂。观察有/无单向拉伸的圆周缺口的圆棒试样的延性裂纹萌生行为表明，采用的两相钢中延性裂纹的主要控制因素不是大夹杂物引起的空洞的增长，而是微核的形核-在大规模塑性应变后，在铁素体-珠光体界面附近出现软相（铁素体相）。考虑到包辛格效应的两个方面，提出了反向载荷下的材料损伤概念，该概念将微孔形核的材料损伤与宏观力学参数相关联：（a）影响变形和应力/应变的机械方面钢结构的行为；（b）由位错行为引起的材料损坏。在提出的有效损伤概念和“两参数准则”的基础上，提出了一种新的循环荷载作用下构件延性开裂的判据，该判据可以应用于单向荷载增加的钢结构。先进的两参数标准的有效性通过对圆棒试样沿轴向方向进行循环载荷试验以及对十字形试样进行3点循环弯曲试验进行验证。因此，发现先进的两参数延性开裂准则是从小规模拉伸试验结果评估结构构件的临界载荷循环的可转移准则。

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