Browsing NTNU Open by Author "Tu, Shengwen"
Now showing items 1-10 of 10
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A method for determining material's equivalent stress-strain curve with any axisymmetric notched tensile specimens without Bridgman correction
Tu, Shengwen; Ren, Xiaobo; He, Jianying; Zhang, Zhiliang (Journal article, 2017)Large deformation analyses of problems such as plastic forming, ductile fracture with finite element method need a full range of material's equivalent stress-strain curve or flow stress-strain curve. The equivalent ... -
A special notched tensile specimen to determine the flow stress-strain curve of hardening materials without applying the Bridgman correction
Tu, Shengwen; Ren, Xiaobo; Nyhus, Bård; Akselsen, Odd Magne; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2017)Structural integrity assessment of weldments requires the input of flow stress-strain curve of each individual material zone. To cope with these challenges, a cylindrical cross weld tensile specimen with a notch located ... -
Determining critical CTOA from energy-load curves with DWTT specimen
Shuai, Jian; Tu, Shengwen; Wang, Junqiang; Ren, Xiaobo; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2017)Running ductile fracture is one of the most catastrophic accidents of pipelines for natural gas transportation. Crack arrest toughness is important for preventing crack extension to a long distance along pipeline. Critical ... -
Determining the tensile properties of Arctic materials and modelling their effects on fracture
Tu, Shengwen (Doctoral theses at NTNU;2018:269, Doctoral thesis, 2018)The fracture behavior of metallic materials at low temperatures arise great attention among the petroleum industries, due to the potential considerable amount of petroleum and gas resources to be found there. Deep understanding ... -
Effect of the Lüders plateau on ductile fracture with MBL model
Tu, Shengwen; Ren, Xiaobo; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2019)In this study, the effect of Lüders plateau on the ductile crack growth resistance has been investigated with the Gurson damage model and the modified boundary layer (MBL) model, under mode I plane strain condition. The ... -
Experimental measurement of temperature-dependent equivalent stress-strain curves of a 420 MPa structural steel with axisymmetric notched tensile specimens
Tu, Shengwen; Ren, Xiaobo; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2019)Recently, the authors in this paper proposed a correction function to determine material’s equivalent stress-strain curve with axisymmetric-notched tensile specimens. In this study, tensile tests were performed at room ... -
Numerical study on the effect of the Lüders plateau on the ductile crack growth resistance of SENT specimens
Tu, Shengwen; Ren, Xiaobo; He, Jianying; Zhang, Zhiliang (Journal article, 2018)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 ... -
On the study of the effect of Luders plateau on fracture response with cohesive zone model
Tu, Shengwen (Peer reviewed; Journal article, 2019)For materials presenting Lüders plateau, low temperatures in the Arctic region will prolong the plateau length. In this study, the effect of Lüders plateau on crack growth resistance has been investigated with cohesive ... -
Stress-strain curves of metallic materials and post-necking strain hardening characterization: A Review
Tu, Shengwen; Ren, Xiaobo; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2019)For metallic materials, standard uniaxial tensile tests with round bar specimens or flat specimens only provide accurate equivalent stress–strain curve before diffuse necking. However, for numerical modelling of problems ... -
Study of low-temperature effect on the fracture locus of a 420-MPa structural steel with the edge tracing method
Tu, Shengwen; Ren, Xiaobo; Kristensen, Tore Andre; He, Jianying; Zhang, Zhiliang (Journal article, 2018)Quasi-static tensile tests with smooth round bar and axisymmetric notched tensile specimens have been performed to study the low-temperature effect on the fracture locus of a 420-MPa structural steel. Combined with a digital ...