Numerical study on the effect of the Lüders plateau on the ductile crack growth resistance of SENT specimens

被引:2
作者
Shengwen Tu
Xiaobo Ren
Jianying He
Zhiliang Zhang
机构
[1] Norwegian University of Science and Technology (NTNU),Department of Structural Engineering
[2] SINTEF Industry,undefined
来源
International Journal of Fracture | 2018年 / 214卷
关键词
Lüders plateau; Ductile crack growth; Resistance curve; Constraint; Stress triaxiality;
D O I
暂无
中图分类号
学科分类号
摘要
The increasing demand of energy prompts the petroleum industry exploitation activities to the Arctic region where the low temperature is a strong challenge, both for structural design and material selection. For structural materials exhibiting the Lüders plateau, it has been reported that lowering the temperature will increase the Lüders plateau length. In order to obtain a deep understanding of the Lüders plateau effect on ductile crack growth resistance, we performed numerical analyses with SENT specimens and the Gurson damage model. The Lüders plateau was simplified by keeping the flow stress constant and varying the plateau length. The results show that the existence of the Lüders plateau does not influence the initiation toughness, however, will alter the material’s fracture resistance significantly. It is found that the Lüders plateau effect is in general controlled by the stress triaxiality level in front of the crack tip. Both the strain hardening and the crack depth effects on resistance curves are alleviated due to the Lüders plateau. For materials with very small initial void volume fraction, the Lüders plateau effect is more pronounced. Since the Lüders plateau intensifies the crack driving force and may lower down crack resistance curve, special attention should be paid to the application of materials with the Lüders plateau in the Arctic.
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页码:185 / 200
页数:15
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