Erratum: “Fatigue Life Prediction for Complex Load Versus Time Histories” (Journal of Engineering Materials and Technology, 1983, 105, pp. 206–214)

Fatigue life prediction for complex load versus time histories is considered from the viewpoint of separating the history into discrete events, or cycles, which may then be used with constant amplitude fatigue data in a cumulative damage type of analysis. Highly irregular histories require special attention, with minor load excursions being considered in cycle counting as temporary interruptions of larger load cycles. Local notch plasticity and mean stress effects are interrelated, and such effects are most rationally accounted for in terms of local notch stresses and strains. The paper describes and discusses a life prediction procedure for notched members which is based on modeling of the stresses and strains occurring locally at the notch.

Download Full-text

Application of a Multiaxial Fatigue Criterion for the Evaluation of Life of Gears of Complex Geometry

Volume 4: 9th International Power Transmission and Gearing Conference, Parts A and B ◽

10.1115/detc2003/ptg-48000 ◽

2003 ◽

Cited By ~ 1

Author(s):

Leonardo Borgianni ◽

Paola Forte ◽

Luigi Marchi

Keyword(s):

Fatigue Life ◽

Stress State ◽

Life Prediction ◽

Complex Geometry ◽

Biaxial Stress ◽

Fatigue Life Prediction ◽

Random Loading ◽

Complex Load ◽

Biaxial Stress State ◽

Principal Axes

Gears can show significant biaxial stress state at tooth root fillet, due to the way they are loaded and their particular geometry. This biaxial stress state can show a significant variability in principal axes during meshing. Moreover loads may have non predictable components that can be evaluated with the aid of recorded data from complex spectra. In these conditions, commonly adopted approaches for fatigue evaluation may be unsuitable for a reliable fatigue life prediction. This work is aimed at discussing a computer implementation of a fatigue life prediction method suitable for multiaxial stress states and constant amplitude or random loading. For random loading a counting procedure to extract cycles from complex load histories is discussed. This method, proposed by Vidal et al., is based on the r.m.s. value of a damage indicator over all the planes through the point where the fatigue life calculation is made. Miner’s rule is used for the evaluation of the overall damage. The whole fatigue life of the component is evaluated in terms of the numbers of repetitions of the loading block. FEM data are used to evaluate stresses under load. The implementation was validated using test data found in the technical literature. Examples of applications to gears are finally discussed.

Download Full-text

A Review of Damage, Void Evolution, and Fatigue Life Prediction Models

10.20944/preprints202102.0537.v1 ◽

2021 ◽

Author(s):

Hsiao Wei Lee ◽

Cemal Basaran

Keyword(s):

Fatigue Life ◽

Damage Evolution ◽

Life Prediction ◽

Prediction Models ◽

Fatigue Life Prediction ◽

Void Evolution ◽

Engineering Materials

This paper aims to provide an overall review of degradation, damage evolution and fatigue models in the literature of various engineering materials, mostly metals, and composites.

Download Full-text