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Open Access Torsional Low-cycle Fatigue of C250 Steel by Using Funnel Specimen

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  Load-displacement (P-V) curve has been obtained of funnel specimen based on cyclic uniaxial tension and compression experiment, Based on the test results and finite element analysis iterative method, the effective cyclic constitutive relationships of C250 steel have been obtained. By using these effective cyclic constitutive relationships, 3D finite element analyses of funnel specimen under torsion are used to reveal the transforming relationship between the torque and the shear stress at the root of funnel specimen, the relationship between the nominal torsional angle and the shear strain at the root of funnel specimen. On the basis of those analyzing method, the low cycle fatigue study under torsion has been achieved. A series of torsional fatigue tests on C250 steel at room temperature by using funnel specimens have been carried out, the low cycle fatigue behavior of C250 steel has been revealed, and the typical Manson-Coffin model is employed to predict the torsional fatigue life of C250 steel.
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Keywords: Manson-Coffin model; funnel specimen of C250 steel; inverse finite element analysis; torsional low-cycle fatigue; transforming relationship between stress and strain

Document Type: Research Article

Affiliations: 1: Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China 2: Beijing Institute of Aeronautical Materials, Beijing 100095, China

Publication date: June 15, 2015

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  • Journal of Aeronautical Materials, founded in 1981, is sponsored by Chinese Society of Aeronautics and Astronautics, and edited and published by editiorial board of Journal of Aeronautical Materials,AVIC Beijing Institute of Aeronautical Material(BIAM).It has been indexed in Scopus (Holland), INSPEC (U.K.), AJ (Russia), CA (US) and UPD (US). Journal of Aeronutical Materials is devoted to reporting new and original experimental and theoretical basic research of aeronautical materials, such as composite design,technology,testing and charaacterizing, and so on.
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