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Fatigue-life prediction using local stress-strain concepts

The primary emphasis of this paper is on the mechanics of a computer algorithm for cumulative fatigue damage

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Abstract

A cumulative-damage approach for predicting fatigue-crack initiation in engineering structures subjected to random loading is outlined. This procedure is based on the assumption that if the stresses and strains at the critical location in a structure can be related to the cyclic stress-strain properties of smooth laboratory specimens, the crack-initiation life in the structure will be the same as the specimen. A flow diagram, indicating the steps required for implementing this procedure on a high-speed digital computer, is discussed in detail.

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Abbreviations

E :

elastic modulus

K′ :

cyclic-strength coefficient

K f :

fatigue-notch factor

2N f :

reversals to failure

ΔS :

nominal stress range

b :

fatigue-strength exponent

c :

fatigue-ductility exponent

Δe :

nominal strain range

n′ :

cyclic strain-hardening exponent

Δ∈:

local strain range

∈f′ :

fatigue-ductility coefficient

Δσ:

local stress range

σ o :

mean stress

σƒ′:

fatigue-strength coefficient

References

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Authors and Affiliations

  1. Structural Dynamics Research Corp., 45227, Cincinnati, OH

    Darrell F. Socie

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  1. Darrell F. Socie
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Socie, D.F. Fatigue-life prediction using local stress-strain concepts. Experimental Mechanics 17, 50–56 (1977). https://doi.org/10.1007/BF02326426

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  • DOI: https://doi.org/10.1007/BF02326426

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