Investigation of the Temperature-Dependent Mechanical Behavior of a Polypropylene-Pine Composite
Publication: Journal of Materials in Civil Engineering
Volume 21, Issue 9
Abstract
Wood-plastic composites have been recognized as versatile and practical materials for use in many light-structural uses. Recently, more structurally demanding applications have surfaced, which require an improved understanding of mechanical performance and design methodologies. Research addressing the influence of service temperature on mechanical performance with the goal of assigning structural design values is lacking. This study examines the effect of temperature on the mechanical performance of a polypropylene-pine composite formulation. Static tests were performed at temperatures between 21.1 and to determine the material constitutive relations and ultimate properties in tension and compression. A statistical approach was proposed to assess design thermal loads according to geographical location. Both Young’s modulus and ultimate stress were found to decrease with temperature while maximum strain increased linearly with temperature. Temperature adjustment factors were developed over the range studied and were found to decrease properties by as much as 50% at the highest service temperatures. A simple thermal load methodology based on an ASHRAE standard was proposed for determining prevailing thermal conditions in design.
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References
Amash, A., and Zugenmaier, P. (1997). “Thermal and dynamic mechanical investigations on fiber-reinforced polypropylene composites.” J. Appl. Polym. Sci., 63(9), 1143–1154.
American Forest & Paper Association (AF&PA). (2005). National design specification for wood construction, AF&PA, Washington, D.C.
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). (2005). “Section 28: Climatic design information.” Handbook—Fundamentals, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta.
ASTM. (1996). “Standard test methods for compressive properties of rigid plastics.” ASTM D 695–96, West Conshohocken, Pa.
ASTM. (1999). “Standard test methods for tensile properties of plastics.” ASTM D 683–99, West Conshohocken, Pa.
ASTM. (2004). “Standard guide for evaluating mechanical and physical properties of wood-plastic composite products.” ASTM D 7031, West Conshohocken, Pa.
Bengtsson, M., Gatenholm, P., and Oksman, K. (2005). “The effect of crosslinking on the properties of polyethylene/wood flour composites.” Compos. Sci. Technol., 65(10), 1468–1479.
Breyer, D. E., Fridley, K. J., and Cobeen, K. E. (1999). Design of wood structures ASD, 4th Ed., McGraw-Hill, New York, 4–45.
Clemons, C. (2002). “Wood-plastic composites in the United States, the interfacing of two industries.” For. Prod. J., 52(6), 10–18.
Conway, J. B. (1967). Numerical methods for creep and rupture analyses, Gordon and Breach, New York.
Haiar, K. J. (2000). “Performance and design of prototype wood-plastic composite sections.” MS thesis, Washington State Univ., Pullman, Wash.
Harper, D. P., Laborie, M. P. G., and Wolcott, M. P. (2009). “The impact of polypropylene-graft-maleic anhydride on the crystallization and dynamic mechanical properties of isotactic polypropylene.” J. Appl. Polym. Sci., 111(2), 753–758.
Kobbe, R. G. (2005). “Creep behavior of wood-polypropylene composites.” MS thesis, Washington State Univ., Pullman, Wash.
Lockyear, S. A. (1999). “Mechanical analysis of transversely loaded wood/plastic sections.” MS thesis, Washington State Univ., Pullman, Wash.
MacGregor, J. G. (1997). Reinforced concrete: Mechanics and design, 3rd Ed., Prentice-Hall, Upper Saddle River, N.J., 74–75.
Murphy, J. F. (2003). Characterization of nonlinear materials, USDA Forest Products Laboratory Technical Note, Madison, Wis.
Salmon, C. G., and Johnson, J. E. (1996). Steel structures: Design and behavior, 4th Ed., Prentice-Hall, Upper Saddle River, N.J., 55–56.
Schildmeyer, A. J. (2006). “Temperature and time dependent behaviors of a wood-polypropylene composite.” MS thesis, Washington State Univ., Pullman, Wash.
Slaughter, A. E. (2004). “Design and fatigue of a structural wood-plastic composite.” MS thesis, Washington State Univ., Pullman, Wash.
Wolcott, M. P. (2001). “Wood-Plastic composites.” Encyclopedia of materials: Science and technology, Buschow et al., eds., Elsevier Science, New York, 9759–9763.
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© 2009 ASCE.
History
Received: Mar 6, 2007
Accepted: Feb 18, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
Notes
Note. Associate Editor: Roberto Lopez-Anido
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