镍基单晶合金多轴非对称循环加载应力弱化损伤与低周疲劳研究

doi:10.7527/S1000-6893.2013.0305

Abstract

Abstract:

This paper presents a study of the tension/torsion low cycle fatigue characteristics under asymmetric cycle loading of nickel-based single crystal superalloy DD3. The stress strain response of specimens and the relationship between test parameters and fatigue life are analyzed. It is discovered that the cyclic hardening and softening characteristics of the material are related to the temperature, loading phase angle and strain loading path; tensile strain range has more contribution than shear strain range to low cycle fatigue failure; specimens all exhibit stress relaxation and gradual micro plastic deformation accumulation under asymmetric cyclic tensile loading; and there exists stress weakening damage. A parameter F which has an exponential function relationship with fatigue life is proposed by considering the stress-weakening damage produced in asymmetric cyclic loading. Combined with the stress-weakening damage F, von Mises stress range, the stress triaxiality factor and crystallographic orientation function, a formula of cyclic plasticity strain energy is put forward as a failure parameter, and a fatigue prediction model is built. Multiple linear regression analysis of low cycle fatigue test data shows that the model has good correlation with the failure cycle.

Key words: single crystals, superalloys, stress-weakening damage, stress ratio, low cycle fatigue, life prediction

CLC Number:

DING Zhiping, ZENG Jun, CHEN Jiping. Study on Stress-weakening Damage and Low Cycle Fatigue of Ni-based Single Crystal Superalloy Under Multiaxial Asymmetric Loading[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(12): 2768-2776.

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Study on Stress-weakening Damage and Low Cycle Fatigue of Ni-based Single Crystal Superalloy Under Multiaxial Asymmetric Loading

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