Modeling the hygrothermal creep behavior of wood plastic composite (WPC) lumber made from thermally modified wood
| Autor: | Yousoo Han, Mehdi Tajvidi, Murtada Abass A. Alrubaie, Roberto Lopez-Anido, Douglas J. Gardner |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Wood-plastic composite 02 engineering and technology Dynamic mechanical analysis Bending 021001 nanoscience & nanotechnology Condensed Matter Physics Viscoelasticity 020303 mechanical engineering & transports 0203 mechanical engineering Creep Water immersion Ceramics and Composites Composite material 0210 nano-technology |
| Zdroj: | Journal of Thermoplastic Composite Materials. 33:1109-1124 |
| ISSN: | 1530-7980 0892-7057 |
| DOI: | 10.1177/0892705718820404 |
| Popis: | The viscoelastic behavior of an extruded wood plastic composite (WPC) made from thermally modified wood under hygrothermal treatment was studied and modeled. Multiple three-point bending creep/recovery tests were carried out using a dynamic mechanical thermal analyzer (DMTA) equipped with a submersible clamp. WPC specimens with a 15-mm span were subjected to two initial applied stresses; 9% and 14% of the flexural strength in 30 min of creep and 30 min of creep recovery under the combined effects of temperature (25°C, 35°C, and 45°C) and water immersion (saltwater (SW) and distilled water). A dry condition WPC control was used to compare the hygrothermal effects with respect to the control conditions. The WPC material in this article exhibited a linear viscoelastic behavior under the effect of temperature, whereas a nonlinear viscoelastic behavior was observed under immersion conditions. A power law model is considered a useful model to describe the creep behavior of WPC specimens with a 15-mm span in the control and the SW conditions and at 45°C. A power law model was used to describe 180-day creep deflection of WPC lumber beams with an 853-mm span subjected to 12 MPa of the flexural strength in four-point bending at 50% relative humidity and at 21°C. The power law model predicts that the WPC lumber will reach a flexural strain in outer fiber of 1% in approximately 150 years. |
| Databáze: | OpenAIRE |
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