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Effect of stress levels on compressive low-cycle fatigue behaviour of softwood

  • Meng Gong and Ian Smith
Published/Copyright: November 16, 2005
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Holzforschung
From the journal Volume 59 Issue 6

Abstract

Low-cycle fatigue (LCF) of spruce under parallel-to-grain compression was investigated to simulate the damage that occurs during extreme events such as hurricanes. Load control was used, with peak stress levels of 75%, 85% and 95% of static compressive strength (Cmax). Changes in the residual cyclic modulus, cyclic creep strain and modified work density were correlated with the number of load cycles to assess their suitability as damage indicators. Creep tests were also carried out and the strain compared with cyclic creep strain under LCF load. Fatigue and creep tests had a total duration of 10 min. A three-element mathematical model was used to predict the cyclic creep strain. Some key findings were that: (1) the residual cyclic modulus varies with the number of load cycles at a given stress level and decreases with an increase in stress level; (2) cyclic creep strain and pure creep strain are strongly influenced by the peak stress level; and creep specimens fail but fatigue specimens do not at a 95% peak stress level; and (3) the three-element mathematical model is appropriate for predicting cyclic creep strain.

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Corresponding author. University of New Brunswick, Wood Science and Technology Centre, 1350 Regent St., Fredericton, NB, E3C 2G6 Canada

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Published Online: 2005-11-16
Published in Print: 2005-11-01

©2005 by Walter de Gruyter Berlin New York

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  4. Acknowledgement
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