Title page for ETD etd-06062005-120333


Type of Document Master's Thesis
Author Mosher, Bryan C.
Author's Email Address bmosher@vt.edu
URN etd-06062005-120333
Title Failure Prediction of Adhesively Bonded Hardboard Doorskin Joints
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Loferski, Joseph R. Committee Co-Chair
Thangjitham, Surot Committee Co-Chair
Dowling, Norman E. Committee Member
Keywords
  • elastic foundation
  • beam
  • finite element
  • wood
  • wood composite
  • hardboard
  • failure
  • adhesive
Date of Defense 2005-05-19
Availability restricted
Abstract
Wood and wood based composites such as hardboard have become very common materials for use in non-structural applications, which include pre-finished paneling, siding, exterior trim, furniture, and door skins. This thesis describes the results of a study of the failure of hardboard door skins. Forces applied during manufacture load the door skins in bending, and in some cases cause a split at the edge of the hardboard. A finite element model as well as a closed form solution based on mechanics of materials were developed to analyze the stresses and deformations of the door skin/stile assembly so that stresses could be predicted for various stile widths and loading conditions. The wood members that make up the frame along the perimeter of the doors, or stiles, were modeled as orthotropic and their properties were selected from available literature. The hardboard was modeled as transversely isotropic, and its properties were determined experimentally. The closed form solution developed can be used to determine the critical geometry for different combinations of hardboard thickness and adhesive joint stiffness. It predicts that as the stile width decreases, the point of maximum deflection, and greatest stresses, moves toward the outside edge of the panel. The ability to predict the critical stile width, or the stile width below which the maximum deflection and stress occurs at the outside edge of the panel, allows one to design the joint to be able to withstand specific loadings and prevent unwanted delamination of the hardboard during manufacture.
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