Fatigue life of structural plywood under two-stage panel shear load: a new cumulative fatigue damage theory |
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Authors: | Takanori Sugimoto Yasutoshi Sasaki |
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Institution: | (1) Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan |
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Abstract: | The fatigue life of structural plywood under two-stage panel shear load was experimentally examined. Two experimental conditions
were determined for two-stage fatigue of plywood specimen: one used variable applied stress and the other used variable stress,
loading waveform, and loading frequency, because fatigue life of wood composite under constant load depended on loading waveform
and loading frequency as well as stress level. The most famous cumulative fatigue damage theory is the Palmgren-Miner rule,
which is the summation of the ratio of the applied loading cycle to the fatigue life under each loading stage. However, the
applicability of this rule to the two-stage fatigue of wood composites has not been investigated. It was first demonstrated
in this study that the fatigue life of the plywood specimen reached in the two-stage fatigue test did not obey the Palmgren-Miner
rule. Here, we propose the new cumulative fatigue damage model by modification of the Palmgren-Miner rule on the basis of
the assumption that fatigue damage accumulates with loading cycle on a logarithmic scale. The newly proposed model was in
good agreement with the fatigue life reached in the two-stage fatigue test. |
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Keywords: | Two-stage fatigue Fatigue life Palmgren-Miner rule New cumulative fatigue damage model |
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