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瞿文隽,周昌玉,于勤.含环向穿透裂纹正交各向异性TA2管道失效评定曲线[J].稀有金属材料与工程(英文),2019,48(4):1051~1058.[Qu Wenjun,Zhou Changyu and Yu Qin.The Failure Assessment Curve of the Circumferential Through-wall Cracked Orthotropic TA2 Pipe[J].Rare Metal Materials and Engineering,2019,48(4):1051~1058.]
The Failure Assessment Curve of the Circumferential Through-wall Cracked Orthotropic TA2 Pipe
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Received:November 26, 2017  Revised:April 24, 2019
DOI:
Key words: TA2  orthotropy  limit load  J integral  failure assessment curve  circumferential through-wall cracked pipe
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Qu Wenjun,Zhou Changyu and Yu Qin  
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Abstract:
      This paper presents the limit loads, J integral results and failure assessment curve (FAC) for the circumferential through-wall cracked isotropic and orthotropic pipe of pure titanium TA2. Limit loads, J integral and curves were calculated based on the 3-dimensional (3-D) elastic-plastic finite element (FE) analyses. Geometric variables of pipe and crack size are systematically varied. Effects of the orthotropy on failure assessment curves are considered. Calculation results show that the limit load and J integral of isotropic pipe and the anisotropic pipe are obvious different. For failure assessment curves, when the load ratio Lr < 0.9, if the orthotropic material is evaluated as an isotropic material, the evaluation results are conservative. When the load ratio Lr > 0.9, if the orthotropic material is evaluated as an isotropic material, the evaluation result is too dangerous. And it is the most dangerous when the mechanical properties of the axial direction are stronger than those of circumferential direction. Thus the orthotropy of circumferential through-wall crack pipe cannot be neglected for defect assessment.