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Prediction of Delay Cycles Due to Instant of Single Overload Cycles by Raghuvir Kumar is a Engineering article available to read on EtoBox.

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## Ahstraet-Crack closure experiments were performed on 6061-T6 altinium alloy using a crack opening displacement gauge for various overload ratios (1.44, 1.67,1.87 and 2.06). The single overload cycle is given at the beginning, after exhausting 25% of the constant amplitude loading (CAL) life and 50% of the CAL life of the specimen. On the basis of these experiments one expression is developed to predict delay cycles due to application of overload cycle. The overloads produce a beneficial effect when they are given early. Later overloads, although giving an increase in life, produce a response of lesser magnitude. The experimental results are plotted on a log-log graph of Nn/N,, versus overload ratio. The experimental data are fitted on a straight line. One power law is developed. ## NOMENCLATURE crack length, mm fatigue crack propagation rate specimen thickness, mm constant of crack growth equation crack opening displacement constant amplitude loading crack growth rate overload ratio effective stress range ratio stress intensity range, kgJmm"'\* exponent of crack growth equation number of cycles number of failure cycles at constant amplitude loading number of cycles to failure de

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Author

Raghuvir Kumar

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0013-7944)

Published

1992

Language

EN

Field

Engineering (Physical Sciences)