Influence of strain rate, temperature and fatigue on the radial compression behaviour of Norway spruce
| Autor: | Amandine Miksic, Birgitta A. Engberg, Pentti Saarenrinne, Juha Koivisto, Carolina Moilanen, Markus Ovaska, L. I. Salminen, Tomas Björkqvist, Mikko J. Alava |
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| Přispěvatelé: | Tampere University, Mechanical Engineering and Industrial Systems, Automation and Hydraulic Engineering, Research area: Measurement Technology and Process Control, Research area: Design, Development and LCM |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
040101 forestry
0106 biological sciences Materials science high strain rate test Voigt-Kelvin material model 04 agricultural and veterinary sciences Split-Hopkinson pressure bar Strain rate Compression (physics) 01 natural sciences split-Hopkinson pressure bar Biomaterials earlywood moist Norway spruce 214 Mechanical engineering Radial compression 010608 biotechnology radial compression behaviour 0401 agriculture forestry and fisheries dynamic modelling of defibration latewood Composite material |
| Zdroj: | Moilanen, C, Björkqvist, T, Ovaska, M, Koivisto, J, Miksic, A, Engberg, B A, Salminen, L I, Saarenrinne, P & Alava, M 2017, ' Influence of strain rate, temperature and fatigue on the radial compression behaviour of Norway spruce ', Holzforschung, vol. 71, no. 6, pp. 505-514 . https://doi.org/10.1515/hf-2016-0144 |
| ISSN: | 1437-434X 0018-3830 |
| DOI: | 10.1515/hf-2016-0144 |
| Popis: | A dynamic elastoplastic compression model of Norway spruce for virtual computer optimization of mechanical pulping processes was developed. The empirical wood behaviour was fitted to a Voigt-Kelvin material model, which is based on quasi static compression and high strain rate compression tests (QSCT and HSRT, respectively) of wood at room temperature and at high temperature (80–100°C). The effect of wood fatigue was also included in the model. Wood compression stress-strain curves have an initial linear elastic region, a plateau region and a densification region. The latter was not reached in the HSRT. Earlywood (EW) and latewood (LW) contributions were considered separately. In the radial direction, the wood structure is layered and can well be modelled by serially loaded layers. The EW model was a two part linear model and the LW was modelled by a linear model, both with a strain rate dependent term. The model corresponds well to the measured values and this is the first compression model for EW and LW that is based on experiments under conditions close to those used in mechanical pulping. |
| Databáze: | OpenAIRE |
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