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A Study on Fatigue Life Assessment of Alloy 718 as a Function of Load Ratio in Conjunction with Newman’s Model

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Abstract

The influence of load ratio (R) on fatigue crack propagation and fatigue life of alloy 718 was investigated using quarter compact tension specimens under ASTM-E647 with constant amplitude loading. A series of fatigue crack growth experiments have been conducted in this study with R ranging from 0.1 to 0.6. Experimental results revealed that fatigue life increased with increase in R, and however, rapid rise in fatigue life of specimens occurred for \(R\ge 0.5\). This is attributed to drop in imposed stress range for \(R\) \(\ge 0.5\). SEM examination of specimens supports this conclusion. Measurement of fracture surfaces revealed that surface roughness \(( {R}_{a})\) and profile’s average peak height \(({R}_{z})\) decreased with increase in R, resulting in a decreased crack growth rate for a given value of stress intensity range for high roughness fracture surfaces. An attempt has been made to model the life of components using Newman’s model in conjunction with plasticity constraint factor ‘\(\alpha\)’.

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Authors and Affiliations

  1. Mechanical Engineering Department, National Institute of Technology Srinagar, Srinagar, J&K, India

    Ashutosh Kumar & G. A. Harmain

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  1. Ashutosh Kumar
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  2. G. A. Harmain
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Correspondence to G. A. Harmain.

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Kumar, A., Harmain, G.A. A Study on Fatigue Life Assessment of Alloy 718 as a Function of Load Ratio in Conjunction with Newman’s Model. Trans Indian Inst Met 76, 1027–1036 (2023). https://doi.org/10.1007/s12666-022-02812-1

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