Preprint Article Version 1 NOT YET PEER-REVIEWED

Modelling Crack Propagation in Aluminium-Alloys 2524-T3 and 7050-T7452 Subjected to Fatigue Loading at Low Temperature

  1. School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
Version 1 : Received: 17 October 2016 / Approved: 17 October 2016 / Online: 17 October 2016 (11:27:13 CEST)

How to cite: Xiong, J.; Liu, M. Modelling Crack Propagation in Aluminium-Alloys 2524-T3 and 7050-T7452 Subjected to Fatigue Loading at Low Temperature. Preprints 2016, 2016100066 (doi: 10.20944/preprints201610.0066.v1). Xiong, J.; Liu, M. Modelling Crack Propagation in Aluminium-Alloys 2524-T3 and 7050-T7452 Subjected to Fatigue Loading at Low Temperature. Preprints 2016, 2016100066 (doi: 10.20944/preprints201610.0066.v1).

Abstract

This paper seeks to model the crack propagation in of AAs (aluminum-alloys) 2524-T3 and 7050-T7452 subjected to fatigue loading at low temperature. Fatigue crack growth tests were performed on AAs 2524-T3 and 7050-T7452 subjected to constant-amplitude and actual random-spectra loading histories at room temperature of about 25 °C and at cryogenic temperature of -70 °C, respectively, to determine their crack growth properties and residual lives. The interaction mechanisms between cryogenic temperature and the fatigue load were deduced on the basis of the results of fractographic analysis. Temperature-dependent residual lives under actual random-spectrum load history were modeled based on a modified accumulation damage rule by accounting for the load interaction. Good correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.

Subject Areas

fatigue; crack growth; low temperature; residual life; aluminum-alloy

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