Dynamic parallel-to-grain compressive properties of three softwoods under seismic strain rates: tests and constitutive modeling
| Autor: | Gaojie Yang, Lipeng Zhang, Baozhuang Zhang, Jitao Yao, Qifang Xie |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
040101 forestry
Softwood Materials science Strain (chemistry) Constitutive equation 020101 civil engineering 04 agricultural and veterinary sciences 02 engineering and technology Strain rate Compression (physics) 0201 civil engineering Biomaterials 0401 agriculture forestry and fisheries Geotechnical engineering Elastic modulus |
| Zdroj: | Holzforschung. 74:927-937 |
| ISSN: | 1437-434X 0018-3830 |
| DOI: | 10.1515/hf-2019-0229 |
| Popis: | Softwood is commonly used in timber structures, whose dynamic compressive properties along the grain direction under seismic rate actions are of major concern. In the present study, 108 samples were examined from three species of softwoods (spruce, Dahurian larch and pine) and subjected to four levels of strain rates (10−4 s−1, 10−3 s−1, 10−2 s−1 and 0.1 s−1) under parallel-to-grain monotonic and repeated compression. The seismic strain rate effects on softwood were investigated by observing the failure mechanisms, engineering stress-strain curves, initial crushing strength, elastic modulus and peak strain. Results demonstrated the high sensitivity of softwood to seismic strain rates. Finally, a rate-dependent constitutive model was developed to predict the stress-strain relationship (both monotonic and repeated loading cases) of softwood under different seismic strain rates. |
| Databáze: | OpenAIRE |
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