Fatigue behavior of Japanese cypress (<i>Chamaecyparis obtusa</i>) under repeated compression loading tests perpendicular to the grain

Ogawa, Keita; Shimizu, Kosuke; Yamasaki, Mariko; Sasaki, Y.

doi:10.1515/hf-2016-0227

Cited by 7 publications

(1 citation statement)

References 15 publications

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“…The existence of a fatigue limit is well established for metals; it remains, however, unclear if such a limit exists for wood (Nielsen 2000a). Several authors estimated an endurance limit for a specific loading type and type of specimen, for example Kyanka (1980) estimated an endurance limit around 35-50% of the maximal bending stress for wood and wood composites, van der Put (1989) estimated an endurance limit around 35% of the maximal load, whereas Ogawa et al (2017) predicted an endurance limit of 60% of the maximal load level for compression loading perpendicular to the grain of Japanese cypress. But ultimately, all the aforementioned endurance limit values resulted from extrapolation of a mathematical model out of the range of experimental data and should therefore only be considered as an estimation.…”

Section: Parameter Estimationmentioning

confidence: 99%

Reaction kinetics investigation in relation to the influence of humidity on fatigue behavior of wood lap joints

et al. 2020

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It is generally assumed that the properties of wood against fatigue are good, but little is known about the properties of adhesively bonded wood, which represents today most of the wood-based products. Lap-shear samples glued with three common wood adhesives [two ductile one-component polyurethane (1C-PUR) systems and one brittle phenol resorcinol formaldehyde (PRF) adhesive] were tested under cyclical loads at three different climates [20°C, 35% − 50% − 85% relative humidity (RH)]. For the analysis of data, an empirical model based on reaction kinetics was developed. In addition, a probabilistic model was used to estimate the endurance limit and the expected run-out lifetime. Both models were combined to accurately model fatigue at high and low relative stress intensity. It was shown that ductile 1C-PUR adhesives perform better than the brittle adhesive system under dry climates (35%–50% RH). However, for higher RH, the brittle PRF adhesive showed better performance, most probably due to a better wood-adhesive adhesion in wet climate. An average endurance limit for tensile shear stresses between 20% and 48% of the mean tensile shear strength (TSS) was estimated for the tested adhesives. It was shown that the model parameters could be linked to fundamental physical constants through the reaction kinetics approach; however, further research is needed to correlate these parameters to specimen-specific quantities.

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Section: Parameter Estimationmentioning

confidence: 99%

Reaction kinetics investigation in relation to the influence of humidity on fatigue behavior of wood lap joints

et al. 2020

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Energetic Investigation of Aging Effect on Mechanical Behavior in Wood by Means of XRD Measurement

Imaeda

Yamasaki

Kojima

et al. 2020

International Journal of Architectural Heritage

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Synchrotron X-ray measurements of cellulose in wood cell wall layers of Pinus densiflora in the transmission and reflectance modes. Part 2: results with axial loading

et al. 2020

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This study applied synchrotron radiation XRD to analyze the mechanical behavior of cellulose microfibrils in wood containing annual rings (thickness: 5 mm), for different layers of the secondary cell wall, under uniaxial load. Cellulose in S2 and in S1 and S3 layers were analyzed respectively, and the data were used to investigate for deformation behavior in the lattice spacing (d004). As a result, the mechanical behavior of cellulose sometimes differed from the behavior of bulk wood. The rigidity of cellulose in the S2 layer was larger than in S1 and S3 layers under both of tensile and compressive loads. However, once standardized with respect to estimated cellulose amount, this standardized rigidity was comparable across all layers and loading conditions. Variation in microfibril angle (MFA) and lattice spacing (d004) of cellulose barely changed at all under compressive load. Under tensile loads, there were both of positive and negative changes in MFA variation in both S2 layer and S1 and S3 layers, while d004 variation had little changes in almost all cases.

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Fatigue behavior of Japanese cypress (Chamaecyparis obtusa) under repeated compression loading tests perpendicular to the grain

Cited by 7 publications

References 15 publications

Reaction kinetics investigation in relation to the influence of humidity on fatigue behavior of wood lap joints

Reaction kinetics investigation in relation to the influence of humidity on fatigue behavior of wood lap joints

Energetic Investigation of Aging Effect on Mechanical Behavior in Wood by Means of XRD Measurement

Synchrotron X-ray measurements of cellulose in wood cell wall layers of Pinus densiflora in the transmission and reflectance modes. Part 2: results with axial loading

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