Assessing biaxial strength characteristics of wood-based structural panels Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fn107104c

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  • Biaxial strength characteristics of wood-based structural panels were evaluated by using analytical and experimental methods. Cruciform plywood specimens were tested under biaxial tensile-tensile, compressive-compressive loadings in a symmetrically-jointed- arm test fixture, which was mounted on a universal testing machine. Performance of the test fixture was also evaluated during the tests. Electrical resistance strain gauges were used to measure strain values at a point of interest, and brittle coatings were also used to analyze strain distributions over the test section. Finite-element analysis was employed to develop an analytical tool. The basic configurations, detail alternatives, and the influence of reinforcement orientation on the uniformity of the biaxial stress/strain distributions in the test section of the cruciform specimen were examined by using the finite-element method. The experimental strain values and those from finite-element analysis were found in close agreement. The Tsai-Wu Tensor Polynomial Strength Theory was used to construct a predicted biaxial strength envelope in stress space. Comparisons were made between the experimental data and the theoretical predictions in quadrants I and III of stress space, as well as between the finite-element results and the theoretical predictions in quadrants II and IV of stress space. Good agreements were found in quadrants I, II and IV at a load value that corresponded with audible cracking. In quadrant III of stress space, compressive-compressive stress space, the experimental failure stress condition did not agree with the analytical solution for the strength theory envelope in that quadrant. With respect to testing method, the jointed-arm test fixture worked well in tension-tension tests. However, a method of special lateral support was needed for the compression-compression biaxial condition. Results also indicated that reinforcement orientation in the arms may influence ultimate load capacity and failure mode of the biaxial specimen.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-09-14T21:43:53Z (GMT) No. of bitstreams: 1 ChengPing1997.pdf: 3697132 bytes, checksum: 528c6d606c8d75f2504e0eba0248da18 (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-09-14T21:38:14Z (GMT) No. of bitstreams: 1 ChengPing1997.pdf: 3697132 bytes, checksum: 528c6d606c8d75f2504e0eba0248da18 (MD5)
  • description.provenance : Submitted by Nitin Mohan (mohanni@onid.orst.edu) on 2010-09-13T19:58:15Z No. of bitstreams: 1 ChengPing1997.pdf: 3697132 bytes, checksum: 528c6d606c8d75f2504e0eba0248da18 (MD5)

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