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首页> 外文期刊>International journal of steel structures >Ductile Fracture Analysis of Welded Hollow Spherical Joints Subjecting Axial Forces with Micromechanical Fracture Models
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Ductile Fracture Analysis of Welded Hollow Spherical Joints Subjecting Axial Forces with Micromechanical Fracture Models

机译：轴力作用下空心球焊接接头的塑性断裂分析

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摘要

Two micromechanical fracture models, void growth model (VGM) and stress modified critical strain (SMCS) model, were adopted to distinguish the failure mechanism of welded hollow spherical (WHS) joints under axial load based on FE analysis. Ductile fracture was successfully predicted for WHS joints under axial tension. The predicted fracture location is at the weld toe between WHS joints and circular hollow section members, which is consistent with corresponding test results. The predicted fracture load is lower than the peak load on the load-displacement curve, which indicates that the failure mechanism of WHS joints under axial tension is fracture due to inadequate strength and the fracture load should be taken as the ultimate load bearing capacity of the joints. A simplified SMCS model was proposed and verified for ductile fracture prediction of WHS joints under axial tension. Micromechanical fracture analysis was also conducted on WHS joints under axial compression. It was obtained by both VGM and SMCS model that no fracture would occur before the load reached its peak value, the reason of which was discussed by tracing the variation of the equivalent plastic stain and stress triaxiality at the potential location of fracture. Therefore, the failure mechanism of WHS joints under axial compression is losing stability with the depression of the sphere cap and the peak load on the load-displacement curve should be taken as the ultimate load bearing capacity of WHS joints.
机译：基于有限元分析，采用两种微机械断裂模型，即空隙生长模型（VGM）和应力修正临界应变（SMCS）模型来区分空心球（WHS）焊接接头在轴向载荷下的失效机理。已成功预测了WHS接头在轴向张力下的韧性断裂。预测的断裂位置在WHS接头和圆形空心型材之间的焊趾处，这与相应的测试结果一致。预测的断裂载荷低于载荷-位移曲线上的峰值载荷，这表明WHS接头在轴向拉伸作用下的破坏机理是由于强度不足而导致的断裂，断裂载荷应被视为极限载荷。关节。提出了一种简化的SMCS模型，并通过该模型验证了WHS接头在轴向张力下的韧性断裂预测。在轴向压缩下，还在WHS接头上进行了微机械断裂分析。通过VGM和SMCS模型都可以得出，在载荷达到峰值之前不会发生断裂，其原因是通过在断裂的潜在位置跟踪等效塑性污渍和应力三轴性的变化来讨论的。因此，WHS接头在轴向压缩下的破坏机理随着球冠的压低而失去稳定性，应将载荷-位移曲线上的峰值载荷作为WHS接头的极限承载力。

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