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XIA Congcong, ZHAO Yangyang, DAI Lianshuang, GONG Baoming, DENG Caiyan, WANG Dongpo. Research on the constraint of SE(T) specimen based on crack tip plastic zone parameters[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(6): 1-7. DOI: 10.12073/j.hjxb.20220718003
Citation: XIA Congcong, ZHAO Yangyang, DAI Lianshuang, GONG Baoming, DENG Caiyan, WANG Dongpo. Research on the constraint of SE(T) specimen based on crack tip plastic zone parameters[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(6): 1-7. DOI: 10.12073/j.hjxb.20220718003

Research on the constraint of SE(T) specimen based on crack tip plastic zone parameters

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  • Received Date: July 17, 2022
  • Available Online: May 30, 2023
  • In this paper, X80 high-strength pipeline steel is taken as the research object. Combined with numerical and theoretical analysis, the constraint parameters r1/2p0rpmaxA_{pz}^{1/4}{\chi _P} based on the geometric characteristics of the plastic zone at the crack tip are studied for the crack tip stress of different single edge notch tensile SE(T) specimens. The in-plane and out-of-plane constraint effects on the fracture toughness of SE(T) specimens of X80 pipeline steel were quantified by fracture toughness tests. The relationship between r_{p0}^{1/2}r_{p\max }^{1/2}A_{pz}^{1/4}{\chi _P}, the uniform of in-plane and out-of-plane constraint based on the plastic zone at the crack tip, and the stress intensity factor K were established. The analytical relationship between the constraint parameters and the T stress (T11 and T33) was determined, and the fracture toughness prediction methods under small-scale yield conditions were proposed through finite element simulation and theoretical analysis.
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    Xia Congcong. Research on the influence of crack tip constraint on the crack growth resistance curve of single-edge notch tension specimens [D]. Tianjin: Tianjin University, 2022.
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