Moisture-dependent orthotropic elasticity and strength properties of Chinese fir wood

Jiang, Jiali; Bachtiar, Erik Valentine; Lu, Jianxiong; Niemz, Peter

doi:10.1007/s00107-017-1166-y

Cited by 28 publications

(23 citation statements)

References 17 publications

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“…directions was recently published by Jiang et al [3]. On the one hand, determined in tension, the Young's moduli and MC relationship published by the authors support the relationship obtained for the tensile storage modulus presented in this study.…”

Section: Resultssupporting

confidence: 90%

“…Only few references cover the anisotropic moduli for Chinese fir wood [3,[16][17][18][19]. Even less is known about the moisture dependency of the anisotropic moduli.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, |ΔnE′| in L direction is less sensitive to MC changes than that in the directions perpendicular to the grain. The theories that ray cells acting as stiffening ribs and the serial earlywood and latewood cells in R direction may be plausible explanations for the lower |ΔnE′| in the R direction than that in the T direction [3,16,17,26,27]. Figure 4 shows the normalized (n) data concerning nE″ for L, R and T specimens with different MC at 1 Hz.…”

Section: Resultsmentioning

confidence: 99%

“…As a highly complex cellular composite, wood by nature is hygroscopic. Therefore, its mechanical property is moisturedependent [1][2][3], not exception for viscoelastic properties. As wood is exposed to varying climatic conditions in many applications, both temperature and moisture content (MC) play leading roles in influencing the mechanical properties of wood.…”

Section: Introductionmentioning

confidence: 99%

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Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood in low temperature environment

Jiang

2018

J Wood Sci

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The influence of moisture content (MC) on the orthotropic viscoelasticity of Chinese fir wood (Cunninghamia lanceolata [Lamb.] Hook.) has been examined in low temperature environment. Storage modulus E′ and loss modulus E″ of wood with six different levels of MC ranging from 0.6 to 22.0% were determined from − 120 to 40 °C and at multi-frequency range of 0.5, 1, 2, 5, and 10 Hz using a TA instruments ® Dynamic Mechanical Analyzer (DMA 2980). The results showed that a distinct moisture dependency is exhibited by the orthotropic viscoelastic behaviour of Chinese fir wood. With the exception of some apparent activation energy (ΔE) for β-relaxation process, the E′ decreased and the E″ peak temperatures moved towards lower temperature and the ΔE for α-relaxation process became lower with MC increasing in all orthotropic directions, whereby individual decline of E′ and the E″ peak temperatures were affected by MC to different degrees. Besides, a little E″ peak at around 0 °C was only seen in L direction, which could be attributed to the melting of frozen water. Furthermore, the dynamic viscoelastic behavior of wood is also dependent on the measurement frequency. The findings suggest that the orthotropic structure and moisture content have an important influence on the viscoelastic performance in low temperature environment.

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Section: Resultssupporting

confidence: 90%

“…Only few references cover the anisotropic moduli for Chinese fir wood [3,[16][17][18][19]. Even less is known about the moisture dependency of the anisotropic moduli.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood in low temperature environment

Jiang

2018

J Wood Sci

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“…Walnut (Bachtiar et al 2017) Cherry (Bachtiar et al 2017) Elastic moduli Ash (Clauss et al 2014) Fir (Jiang et al 2017) Elastic moduli Beech (Ozyhar et al 2013) Ash (Niemz et al 2014) Maple ( Brought to you by | Lib4RI Eawag-Empa Authenticated Download Date | 1/24/18 8:57 AM of 2.0% ± 21% is calculated for cherry wood ( Figure 5). The corresponding ratios are smaller in case of tests in the Rand T-directions.…”

Section: Elastic Modulimentioning

confidence: 99%

Mechanical behavior of walnut (Juglans regia L.) and cherry (Prunus avium L.) wood in tension and compression in all anatomical directions. Revisiting the tensile/compressive stiffness ratios of wood

2017

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The mechanical properties of walnut (Juglans regiaL.) and cherry (Prunus aviumL.) woods, as frequent raw materials in cultural heritage objects, have been investigated as a function of the anatomical directions and the moisture content (MC). The strength data are decreasing with increasing MC, whereas the tensile strength in the longitudinal direction is higher by factors of 1.5–2 compared to the compression strength. Moreover, the inequality of tensile and compressive stiffness is discussed, which is a matter of debate since a long time. This so-called bimodular behavior is difficult to describe in a generalized mode due to the high data variability if tension and compression properties are analyzed on different samples. If tensile and compressive stiffness tests are performed on the same samples of walnut and cherry wood, the ratio between these properties is significantly higher than 1.

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Comparison of moisture-dependent orthotropic Young’s moduli of Chinese fir wood determined by ultrasonic wave method and static compression or tension tests

Jiang

Bachtiar

et al. 2017

Eur. J. Wood Prod.

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Moisture-dependent orthotropic elasticity and strength properties of Chinese fir wood

Cited by 28 publications

References 17 publications

Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood in low temperature environment

Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood in low temperature environment

Mechanical behavior of walnut (Juglans regia L.) and cherry (Prunus avium L.) wood in tension and compression in all anatomical directions. Revisiting the tensile/compressive stiffness ratios of wood

Comparison of moisture-dependent orthotropic Young’s moduli of Chinese fir wood determined by ultrasonic wave method and static compression or tension tests

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