Properties of veneer sliced from serpentine-end-matched flitches Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/f1881p03k

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Eighteen Ponderosa Pine (Pinus ponderosa Dougl.ex.laws) veneer flitches were randomly selected and crosscut into paired flitches. Serpentine-end-matched (SEM) joints were machined in the flitches, joint amplitude equal to the width in one half of the paired flitch and joint amplitude equal to 2/3 width in the other half of the paired flitches. A cross-linking polyvinyl acetate emulsion (PVA) was used. The glued flitches were conditioned, sliced and dried using typical industry methods. Three thicknesses of veneer were cut from each veneer flitch, 1/16 in (1.59mm), 1/12 in (2.17mm) and 1/8 in (3.18mm). Of 468 pieces of veneer produced, only 20 pieces exhibited some bond failure during manufacturing. The failed bonds occurred in veneer from 7 of the 36 flitches sliced. Subsamples of paired flitches were chosen and the related veneers tested in tension. The strength of each veneer and failure mode was recorded. Of 155 pieces of veneer tested, 55% failed with some wood failure. The average percentage of wood failure was 32.5% with most failure occurring along the entire glue line except at the joint apex. Finite element modeling was applied to examine the stress distribution through an SEM joint in the veneer. To address the thin nature of the adhesive layer, the submodeling procedure was conducted. The effects of adherend stiffness dissimilarity, glue line discontinuity, adhesive stiffness, adhesive layer thickness and geometrical shape were evaluated. The adherend stiffness dissimilarity was found to have a significant effect on the stress distribution. When the convex adherend was chosen as the stiffer of the two adherends, a favorable stress distribution was achieved. This choice also optimized the impact of stress magnification due to glue line discontinuity. An adhesive with stiffness that is about the same as the stiffness of the adherend tends to reduce stress magnification. Stresses in the adherends and adhesive were not sensitive to the thickness of the adhesive layer and the geometric shapes of the SEM joints.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale, 24-bit Color) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Digital Production(digitalproduc@gmail.com) on 2010-09-16T20:17:05Z (GMT) No. of bitstreams: 1 LiuYuqing2000.pdf: 6587980 bytes, checksum: 54702aef0eddd5df999f8949ea4a9a91 (MD5)
  • description.provenance : Submitted by Nitin Mohan (mohanni@onid.orst.edu) on 2010-09-16T19:25:08Z No. of bitstreams: 1 LiuYuqing2000.pdf: 6587980 bytes, checksum: 54702aef0eddd5df999f8949ea4a9a91 (MD5)
  • description.provenance : Made available in DSpace on 2010-09-17T15:37:42Z (GMT). No. of bitstreams: 1 LiuYuqing2000.pdf: 6587980 bytes, checksum: 54702aef0eddd5df999f8949ea4a9a91 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-09-17T15:37:42Z (GMT) No. of bitstreams: 1 LiuYuqing2000.pdf: 6587980 bytes, checksum: 54702aef0eddd5df999f8949ea4a9a91 (MD5)

Relationships

In Administrative Set:
Last modified: 08/01/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items