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Publication: Forest Products Journal
Authors: Zhang Jilei|Quin Franklin|Tackett Bob
Reference ID: 51(10):73-78
Publish Year: 2001
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Title: Bending fatigue life of two-pin dowel joints constructed of wood and wood composites
Description:
This study investigated fatigue strength properties of T-type, two-pin moment-resisting dowel joints subjected to constant and stepped cyclic bending loads. Red oak, yellow-poplar, plywood, aspen Engineered Strand Lumber (ESL), and particleboard were tested in the construction of joints. Regression of M-N data (moment versus log number of cycles to failure) of each joint material type subjected to constant cyclic bending loads resulted in linear equations for M-N curves. Fatigue life of dowel joints subjected to a given stepped cyclic bending schedule can be predicted with the Palmgren-Miner rule based on their M-N curves. Joints constructed of particleboard had significantly lower fatigue life than joints of red oak, yellow-poplar, plywood, and ESL. No evidence of significant differences existed in fatigue life among joints constructed of red oak, yellow-poplar, plywood, and ESL, but results of static bending tests showed significant differences in bending strength among them. Joint resistance to fatigue failure should be taken into account in strength design of furniture frames that are subjected to repeated loading.
This study investigated fatigue strength properties of T-type, two-pin moment-resisting dowel joints subjected to constant and stepped cyclic bending loads. Red oak, yellow-poplar, plywood, aspen Engineered Strand Lumber (ESL), and particleboard were tested in the construction of joints. Regression of M-N data (moment versus log number of cycles to failure) of each joint material type subjected to constant cyclic bending loads resulted in linear equations for M-N curves. Fatigue life of dowel joints subjected to a given stepped cyclic bending schedule can be predicted with the Palmgren-Miner rule based on their M-N curves. Joints constructed of particleboard had significantly lower fatigue life than joints of red oak, yellow-poplar, plywood, and ESL. No evidence of significant differences existed in fatigue life among joints constructed of red oak, yellow-poplar, plywood, and ESL, but results of static bending tests showed significant differences in bending strength among them. Joint resistance to fatigue failure should be taken into account in strength design of furniture frames that are subjected to repeated loading.
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