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High-temperature fatigue-life estimation: Extension of a unified theory

Elevated-temperature behavior of material is established on the basis of short-term tensile-test results

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Abstract

A procedure is presented for predicting the fatigue behavior at elevated temperature by extending the unified theory of fatigue damage previously proposed for room temperature. The method predicts the experimental results of high-temperature push-pull tests under isothermal conditions, using the total strain range. The analysis is based on parameters obtained from short-term tensile tests in which the temperature and the strain rate are the same as for the fatigue test.

The procedure is applied for fatigue of a stainless steel at 650°C under cyclic axial strain. It has also been applied to published data for three austenitic stainless steels. In general, the present procedure gives estimates closer to experimental results than those obtained from other known methods.

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Abbreviations

A, C, K, c, k, p :

material constants

E :

elastic modulus, (N/m2)

f :

frequency of cycling

m :

strain-hardening exponent in short-term tensile test

N :

number of cycles at failure

T :

test temperature (°C)

T m :

melting temperature (°C)

t r :

time for rupture in a creep test

β:

slope of straight line in δɛ p —N diagram

v e :

Poisson's ratio for elastic strain

v p :

Poisson's ratio for plastic strain

σ u :

ultimate tensile strength, (N/m2)

σ f :

true stress at fracture, (N/m2)

σ r :

applied stress in a creep test

\(\dot \in \) :

axial-strain rate (s−1)

ɛ f :

true strain at fracture

References

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Authors and Affiliations

  1. Section fo Applied Mechanics, Department of Mechanical Engineering, Ecole Polytechnique, Montreal, Canada

    Thang Bui-Quoc

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  1. Thang Bui-Quoc
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Bui-Quoc, T. High-temperature fatigue-life estimation: Extension of a unified theory. Experimental Mechanics 15, 219–225 (1975). https://doi.org/10.1007/BF02319426

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  • DOI: https://doi.org/10.1007/BF02319426

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