Application of Life-Dependent Material Parameters to Fatigue Life Prediction under Multiaxial and Non-Zero Mean Loading

• Published in: Materials Vol. 13; no. 7; p. 1587
• Main Authors: Kluger, Krzysztof, Karolczuk, Aleksander, Derda, Szymon
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 30.03.2020; MDPI
• Subjects: 7075-T651 aluminium alloy; Aluminum base alloys; Fatigue life; fatigue life prediction; Fatigue tests; Life prediction; life-dependent material parameters; mean value of stress; Metal fatigue; multiaxial fatigue; Parameters; S355 steel; Shear stress; Verification; 7075-T651 aluminium alloy; multiaxial fatigue; life-dependent material parameters; fatigue life prediction; S355 steel; mean value of stress
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma13071587

This study presents the life-dependent material parameters concept as applied to several well-known fatigue models for the purpose of life prediction under multiaxial and non-zero mean loading. The necessity of replacing the fixed material parameters with life-dependent parameters is demonstrated. The aim of the research here is verification of the life-dependent material parameters concept when applied to multiaxial fatigue loading with non-zero mean stress. The verification is performed with new experimental fatigue test results on a 7075-T651 aluminium alloy and S355 steel subjected to multiaxial cyclic bending and torsion loading under stress ratios equal to = -0.5 and 0.0, respectively. The received results exhibit the significant effect of the non-zero mean value of shear stress on the fatigue life of S355 steel. The prediction of fatigue life was improved when using the life-dependent material parameters compared to the fixed material parameters.