Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Characterizing Macroscopic Creep Behavior of Wood-Plastic Composites in Tension and Compression

Source: IN: 10th International Conference on Wood & Biofiber Plastic Composites and Cellulose Nanocomposites Symposium : May 11-13, 2009, Monona Terrace Community & Convention Center, Madison, Wisconsin, USA. Madison, WI : Forest Products Society, c2010. 289 p. ISBN: 9781892529558; 2010

Author(s)Hamel, S.E.; Bechle, N.J.; Hermanson, J.C.; Cramer, S.M.

Publication Year: 2010  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4714-2A

Abstract: The polymers within wood-plastic composites (WPCs) are known to experience significant time-dependent deformation, or creep. While extensive work has been done on the creep behavior of pure polymers, little information is available on the effects of mixing the polymers with large amounts of wood or other bio-based fillers. As the market increases for structural WPC products that may be subjected to sustained loads, it is imperative that this creep behavior be understood. This study characterizes the time-dependent deformation of two WPC formulations [polypropylene and high-density polyethylene (HDPE)] in tension, compression, and flexure. It was found that the power law (Findley, Shapery, etc.) fits the data at various stress levels and loading mechanisms, for both formulations. This means that the deformation rate linearly decreases in log-log space and, after 400 d of testing; almost all the tests that have not failed remain in primary creep. The time-dependent constants associated with the power law and their stress dependencies are also presented.

Keywords: Polyethylene; composite materials; deterioration; thermoplastic composites; mechanical properties; deformations; creep; extrusion process; injection molding of plastics; wood-plastic composites; modulus of elasticity; thermoplastic composites; bending; polypropylene; wood-plastic materials; HDPE; failure; tension; strength; tensile strength; bending strength; compression tests; high density polyethylene; power law

Publication Review Process: Non-Refereed (Other)

File size: 263 kb(s)

Date posted: 06/06/2011
RITS Product ID: 36106
Current FPL Scientist associated with this product
Hermanson, John C.
Research General Engineer
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »