Near-tip residual stress as an independent load interaction mechanism

Sunder, R and Raut, D and Jayaram, V and Kumar, P and Shastri, V (2021) Near-tip residual stress as an independent load interaction mechanism. In: International Journal of Fatigue, 151 .

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Abstract

Closure-free intrinsic threshold stress intensity, ΔKth,i, varies significantly as a unique function of near-tip residual stress. It does so in equal measure in 5 mm and 50 mm thick compact tension specimens. Specially designed load sequences employing marker loads are employed to fractographically characterize the effect of load history on fatigue crack growth rate under closure-free conditions in 7075-T6 Al-alloy. Observed variations correlate with ΔKth,i, confirming that near-tip residual stress operates as an independent load interaction mechanism. A certain ‘micro latency’ before crack arrest due to increased ΔKth,i is investigated under different gaseous environments through experiments involving hold time.

Item Type:	Journal Article
Publication:	International Journal of Fatigue
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Aluminum alloys; Growth rate; Residual stresses; Stress intensity factors, Compact tension specimen; Interaction mechanisms; Intrinsic threshold stress intensity; Load history; Load interaction; Load sequences; Micro latency in crack arrest; Near threshold crack growth; Near-tip residual stress; Threshold stress intensity, Crack closure
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	03 Mar 2023 09:41
Last Modified:	03 Mar 2023 09:41
URI:	https://eprints.iisc.ac.in/id/eprint/80807

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