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: Modeling Wood-Plastic Composites Using Nonlinear Uniaxial Data

Source: In: 9th International Conference on Wood & Biofiber Plastic Composites, May 21-23, 2007, Monona terrace Community & Convention Center, Madison, Wisconsin, p. 412; 2007

Author(s)Bechle, Hermanson

Publication Year: 2007  View PDF »

Category: Journal Articles

Abstract: Biofiber-plastic composites are known to exhibit nonlinear load-displacement behavior when loaded at small-scale standardized test rates (1% strain/min.). The observed nonlinear behavior in tension, compression, and shear is unique to each mode of loading. Flexural loading incorporates all three aforementioned loading modes; therefore, in accordance with conservation of energy, each unique behavior must combine to yield the observed flexural behavior. As part of a broader study to determine the large-scale behavior of wood-plastic composites (WPC), the small-scale mechanical properties of six diverse formulations of extruded WPCs were established using small coupons cut from full-size structural components. To determine the nonlinear stress-strain relationships for the six different formulations, testing was conducted in tension (ASTM D638), compression (method developed by the authors), and flexure (ASTM D790 to obtain the shear modulus as described in ASTM D198 Appendix IV). A function ofstrain with both linear and inverse-hyperbolic sine terms accurately represented the observed stress-strain behavior. The resulting equations were included in a user-defined material model within a finite element analysis to verify the functional representation of the different loading modes with the conservation of energy. The load-displacement output from the finite element analysis of full-size members in flexure accurately depicted the load-displacement measured for the corresponding specimens. Having verified the stress-strain relationships for small-scale, they will be utilized as a basis for large-scale model development.

File size: 35 kb(s)

Date posted: 06/18/2009
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 »