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DESIGN AND STRUCTURAL ANALYSIS OF SOFA FRAMES.
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Published on 2001 by

This projects goals are to evaluate the structure and strength design of Schnadig three-seat sofa frames, summarize current available information on engineering design, derive cyclic schedules for durability evaluation of frame components, and improve the design to meet product performance requirement specified by Schnadig. The target goal of medium or above acceptance level of General Service Administration (GSA) performance test was expected for the improved design. The design procedures and testing results in the study are also applicable to other frames, and can be used as a guideline for product engineering and reengineering. In this study, the mechanical and strength properties of frames, and members and joints, were evaluated. Schnadig three-seat sofa frames were evaluated by the performance tests. Six sets of tests were conducted with three replicates for each test. The critical joints and members were identified. Generally the frames did not reach the anticipated medium acceptance level except for the arm vertical test, where all the tested frames passed heavy duty. The inadequate connection of joints and the weak member were the major cause of failure. Next, the static and fatigue properties of selected plywood, oriented strand board (OSB) and particle board (PB) were investigated. The regression equations of S-N (stress versus number of cycles to failure) through low 5% points (i.e., the 5th percentile) were derived for all selected wood composite materials and proposed as design equations for achieving a conservative design of furniture frame structural members considering fatigue effects. It was found that the fitting constant E in the S-N equation at low 5% data was 0.85, and the constant H values were 0.06, 0.08, and 0.10, for plywood, OSB, and PB, respectively. Analysis results indicted that when cyclic stepped load effects were considered, the allowable design stress for plywood, OSB, and PB should not exceed respectively, 54%, 64%, and 68% of their.

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