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Title: Chapter 8 optimized test design for identification of the variation of elastic stiffness properties of Loblolly Pine (Pinus taeda) pith to bark

Source: In: C. Sciammarella et al. (eds.), Experimental and Applied Mechanics, Volume 4.

Author(s)Kretschmann, David; Considine, John; Pierron, F.

Publication Year: 2016  View PDF »

Category: Book Chapter
Associated Research Project(s):   FPL-4709-4B  FPL-4714-1B

Abstract: This article presents the design optimization of an un-notched Iosipescu test specimen whose goal is the characterization of the material elastic stiffnesses of a Loblolly (Pinus taeda) or Lodgepole pine (Pinus contorta) sample in one single test. A series of finite element (FE) and grid simulations were conducted to determine displacement and strain fields for various ring angles, ring spaces, and proportions of latewood per ring. These displacement and strain fields were utilized to determine the constitutive parameters for the woody material using VFM. Using an error function based on a comparison of the input stiffnesses and those identified by grid simulation information it was possible to narrow the optimum ring angle at which test specimens should be tested. The results of this work suggest that the starting angles for the unnotched Iosipescu test specimens should be approximately 45° to produce the smallest identification error.

Keywords: Experimental design, Un-notched Iosipescu test, Virtual fields method (VFM), Elastic stiffness parameters, Computer simulations

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 708 kb(s)

Date posted: 11/02/2016

This publication is also viewable on Treesearch:  view
RITS Product ID: 83613
Current FPL Scientists associated with this product (listed alphabetically)
Considine, John M.
Materials Research Engineer
Kretschmann, David E.
Research General Engineer
 

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