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Forest Products Laboratory
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Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Investigating Deformation in HDPE-Wood Flour Composites Using Uniaxial Tension and Nanoindentation Experiments

Source: Tenth International Conference on Wood & Biofiber Plastic Composites and Cellulose Nanocomposites Sysmposium, May 11-13, Madison, WI. Madison, WI : Forest Products Society, c2010. ISBN 978-1-892529-55-8. pp. 121-125; 2010

Author(s)Jakes, Joseph E.; Bechle, Nathan J.; Hamel, Scott; Gronvold, Arthur G.; Hermanson, John C.; Stone, Donald S.

Publication Year: 2010  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-1A   FPL-4714-2A

Abstract: Deformation properties of a high-density polyethylene (HDPE)-wood flour composite were investigated using uniaxial tension and nanoindentation experiments.Before composite failure under tension, the composite exhibited qualitative behavior and flow-stresses similar to those of neat HDPE. However, the composite failed at low strains (~0.03) and did not exhibit the necking process characteristic of neat HDPE. Nanoindentation techniques, producing indents less than 10 vm across, are capable of probing the properties of the HDPE matrix within the composite. Using our broadband nanoindentation creep (BNC) method, we measured instantaneous hardness(H) of the HDPE matrix over four decades of indentation strain-rate (10-3-101). At the lowest strain rate, H ranges from 60 to 90 MPa; at the highest strain rate, H increases up to 200 MPa. The H data were converted to uniaxial flow-stress data and compared to yield-stress data determined from tensile experiments performed on the composite. Differences between the nanoindentation-based uniaxial flow-stress and tensile uniaxial yield-stress data can be explained in part by the role of hydrostatic pressure beneath the indenter.

Keywords: Wood-plastic composites; polyethylene; composite materials; deterioration; wood flour; thermoplastic composites; mechanical properties; flexure; elasticity; modulus of elasticity; nanotechnology; nanostructured materials; measurement; microstructure; hardness; deformation; creep; extrusion process; injection molding of plastics; creep; wood-plastic materials; HDPE; nanoindentation; broadband nanoindentation creep; BNC; failure; uniaxial tension; tension

Publication Review Process: Non-Refereed (Other)

File size: 797 kb(s)

Date posted: 05/17/2010
RITS Product ID: 35749
Current FPL Scientists associated with this product (listed alphabetically)
Hermanson, John C.
Research General Engineer
Jakes, Joseph
Research Materials Engineer

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