Mean Stress and Ratcheting Considerations in Uniaxial Fatigue under Stress Control

K.S. Kim; H.S. Kim; C.B. Lim

doi:10.4028/www.scientific.net/AMR.41-42.147

Paper Titles

On the Use of Mechanical Weight Functions for Practical Evaluation of Thermal Shock SIF's in Flexibly Restrained Edge-Cracked Plates
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Asymptotic Analysis of Size Dependent Fracture Strength Using Boundary Effect Concept
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Modeling and Analysis of Compressive Properties of Porous NiTi Shape Memory Alloy Using Artificial Neural Network
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A Preliminary Evaluation on the Fracture Toughness of Heat Treated Aluminium High Pressure Diecastings
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Mean Stress and Ratcheting Considerations in Uniaxial Fatigue under Stress Control
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A Practical Approach for Evaluation of Thermal Shock SIF's in Flexibly Restrained Edge-Cracked Plates
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Discontinuous Growth Mechanisms of Mode II Crack under High-Speed Impact Conditions
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Diagnosing Boiler Tube Failures Related to Overheating
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The Frequency Effects on Fatigue Threshold of PVC-M and PVC-U in Air and Water Medium
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Mean Stress and Ratcheting Considerations in Uniaxial Fatigue under Stress Control

Abstract:

The fatigue life data obtained under stress control conditions with and without mean stress are interpreted with reference to mean stress and ratcheting effects. Tests are conducted on nickel-base super-alloy Inconel 718 at 649°C and copper alloy Elbrodur-NIB at room temperature. The ratcheting strains at failure are obtained, and mean stress models such as the modified Goodman equation, the Smith-Watson-Topper parameter, and the Walker parameter are evaluated. The results are discussed in comparison for the two materials.