Influence Analysis of Multifactor on LCF Damage of Single Crystal Nickel-Based Superalloy under Multiaxial Non-Proportional Loading

Abstract:

A formula of equivalent strain for FCC single crystal superalloy was derived based on Hill’s yield criterion and was used for design of biaxial tension-torsion strain paths and loading levels of specimens. biaxial tension-torsion non-proportional cyclic loading process for single crystal nickel-based superalloy at the temperature of 680°C and 850°C was simulated by FEM analyzes; and influence degree of factors, such as strain range, strain path angle, tension-torsion loading phase angle, cycle characteristics and temperature etc., to low cycle fatigue damage of single crystal nickel-based superalloy were analyzed by using analysis of variance based on orthogonal experiments. The results show that if Hill’s equivalent stress range is used as a fatigue damage parameter, the factors produce effects on low cycle fatigue damage of single crystal nickel-based superalloy. The factors are listed in the order of significance as followed: temperature, strain range, tension-torsion loading phase angle, strain path angle and axial loading strain ratio.

• Periodical: Advanced Materials Research (Volumes 139-141)
• Pages: 198-204
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.139-141.198
• Online since: October 2010
• Authors: Zhi Ping Ding, Ji Ping Chen, Teng Fei Wang, Ming Li
• Keywords: Analysis of Variance (ANOVA), Low Cycle Fatigue, Multiaxial Non-Proportional Loading, Orthogonal Experiment, Single Crystal Nickel-Based Superalloy

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