Numerical study on the effect of the Lüders plateau on the ductile crack growth resistance of SENT specimens
- 128 Downloads
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.
KeywordsLüders plateau Ductile crack growth Resistance curve Constraint Stress triaxiality
Chinese Scholarship Council; Research Council of Norway, Grant/Award No.: 228513/E30.
- O’Dowd NP, Shih CF (1991) Family of crack-tip fields characterized by a triaxiality parameter–I. Structure of fields. J Mech Phys Solids 39:981–1015Google Scholar
- Ren X, Nordhagen HO, Zhang Z, (2015). Tensile properties of 420MPa steel at low temperature. In: Twenty-fifth international ocean and polar engineering conference, HawaiiGoogle Scholar
- Tvergaard V (1982) On localization in ductile materials containing spherical voids. Int J Fract 18:237–252Google Scholar