Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
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Meng Gong
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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©2005 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Contents
- Species index (scientific names)
- Subject Index
- Acknowledgement
- Author Index
- Ultrastructural changes in a holocellulose pulp revealed by enzymes, thermoporosimetry and atomic force microscopy
- Development of wet strength additives from wheat gluten
- Characterization of electrolyzed magnesium spent-sulfite liquor
- Molecular weight-functional group relations in softwood residual kraft lignins
- Structure-activity relationships of cadinane-type sesquiterpene derivatives against wood-decay fungi
- Effect of water on wood liquefaction and the properties of phenolated wood
- Effect of wood species and molecular weight of phenolic resins on curing behavior and bonding development
- Contact-free measurement and non-linear finite element analyses of strain distribution along wood adhesive bonds
- Comparison between HT-dried and LT-dried spruce timber in terms of shape and dimensional stability
- Physical properties of earlywood and latewood of Pinus radiata D. Don: Anisotropic shrinkage, equilibrium moisture content and fibre saturation point
- Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
- Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine
- Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
- Oxalate regulation by two brown rot fungi decaying oxalate-amended and non-amended wood
- Pine and spruce roundwood species classification using multivariate image analysis on bark
- Detection and species discrimination using rDNA T-RFLP for identification of wood decay fungi
- Personalia
- Award presentation on the occasion of the 13th International Symposium on Wood, Fibre and Pulping Chemistry, May 16–19, 2005, Auckland, New Zealand
- NMR studies on Fraser fir Abies fraseri (Pursh) Poir. Lignins
Articles in the same Issue
- Contents
- Species index (scientific names)
- Subject Index
- Acknowledgement
- Author Index
- Ultrastructural changes in a holocellulose pulp revealed by enzymes, thermoporosimetry and atomic force microscopy
- Development of wet strength additives from wheat gluten
- Characterization of electrolyzed magnesium spent-sulfite liquor
- Molecular weight-functional group relations in softwood residual kraft lignins
- Structure-activity relationships of cadinane-type sesquiterpene derivatives against wood-decay fungi
- Effect of water on wood liquefaction and the properties of phenolated wood
- Effect of wood species and molecular weight of phenolic resins on curing behavior and bonding development
- Contact-free measurement and non-linear finite element analyses of strain distribution along wood adhesive bonds
- Comparison between HT-dried and LT-dried spruce timber in terms of shape and dimensional stability
- Physical properties of earlywood and latewood of Pinus radiata D. Don: Anisotropic shrinkage, equilibrium moisture content and fibre saturation point
- Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
- Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine
- Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
- Oxalate regulation by two brown rot fungi decaying oxalate-amended and non-amended wood
- Pine and spruce roundwood species classification using multivariate image analysis on bark
- Detection and species discrimination using rDNA T-RFLP for identification of wood decay fungi
- Personalia
- Award presentation on the occasion of the 13th International Symposium on Wood, Fibre and Pulping Chemistry, May 16–19, 2005, Auckland, New Zealand
- NMR studies on Fraser fir Abies fraseri (Pursh) Poir. Lignins