Fatigue life of structural plywood under two-stage panel shear load: A new cumulative fatigue damage theory

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, be...

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Bibliographic Details
Published inJournal of wood science Vol. 53; no. 3; pp. 211 - 217
Main Authors Sugimoto, T.(Nagoya Univ. (Japan)), Sasaki, Y
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.06.2007
Subjects
BOIS DE CHARPENTE
CONSTRUCTION MATERIALS
CONTREPLAQUE
Crack propagation
Damage accumulation
Damage assessment
Fatigue failure
Fatigue life
Fatigue tests
LARIX SIBIRICA
MADERA DE CONSTRUCCION
MATERIALES DE CONSTRUCCION
MATERIAU DE CONSTRUCTION
MECHANICAL PROPERTIES
METHODE
METHODS
METODOS
Palmgren-Miner rule
PLYWOOD
PROPIEDADES MECANICAS
PROPRIETE MECANIQUE
STRUCTURAL TIMBER
TABLEROS CONTRACHAPEADOS
Wood composites
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Summary: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.
Bibliography:U30
K50
2007007050
ISSN:1435-0211
1611-4663
DOI:10.1007/s10086-006-0855-7