Time dependence of the orthotropic compression Young’s moduli and Poisson’s ratios of Chinese fir wood
-
Jiali Jiang
,
Bachtiar Erik Valentine
Abstract
The time dependency of the orthotropic compliance for Chinese fir wood [Cunninghamia lanceolata (Lamb.) Hook] has been investigated by performing compressive creep experiments in all orthotropic directions. Time evolution of the creep strain in the axial and lateral directions was recorded by means of the digital image correlation (DIC) technique, to determine the diagonal and nondiagonal elements of the viscoelastic compliance matrix. The results reveal the significant influence of time on the mechanical behavior. The orthotropic nature of the viscoelastic compliance is highlighted by the different time dependency of the Young’s moduli and the Poisson’s ratios obtained for the individual directions. Differences among the time-dependent stress-strain relationship determined at the 25, 50, and 75% stress levels indicate that the viscoelastic behavior of wood is also load-dependent. A Poisson’s ratio values, which are increasing with time in νLR, νLT, νRT, νTR, and decreasing in νRL and νTL, demonstrate that the creep strain is influenced by loading directions. The substantially different time dependency of the nondiagonal elements of the compliance matrix further reveals the orthotropic compliance asymmetry and emphasizes the complexity of the viscoelastic character of wood.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 31570548
Funding statement: This research was sponsored by the National Natural Science Foundation of China (No. 31570548). J.J. would like to gratefully acknowledge the financial support from the China Scholarship Council (CSC). A special thanks goes to Franco Michel and Thomas Schnider for their help during specimen preparation and their expert assistance in conducting the measurements.
Acknowledgments:
This research was sponsored by the National Natural Science Foundation of China (No. 31570548). J.J. would like to gratefully acknowledge the financial support from the China Scholarship Council (CSC). A special thanks goes to Franco Michel and Thomas Schnider for their help during specimen preparation and their expert assistance in conducting the measurements.
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Articles in the same Issue
- Frontmatter
- Original Articles
- Preparation of prehydrolysis-TMPs with different severity factors and analysis of the pulps and byproducts
- Differences in solubility parameters and susceptibility to salting-out between softwood and hardwood lignosulfonates
- Modified sodium lignosulfonates (NaLS) with straight chain alcohols and their aggregation behavior and adsorption characteristics on solid surfaces
- Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage
- Semitransparent, durable superhydrophobic polydimethylsiloxane/SiO2 nanocomposite coatings on varnished wood
- Comparative study of the topochemistry on delignification of Japanese beech (Fagus crenata) in subcritical phenol and subcritical water
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- Relation of transverse compression properties and the degree of brown rot biodeterioration of Pinus glabra in the soil block test
- Four-point bending strength of key-hole side-edge-notched western hemlock (Tsuga heterophylla) wood
- Determination of the elasto-plastic material characteristics of Norway spruce and European beech wood by experimental and numerical analyses
- Time dependence of the orthotropic compression Young’s moduli and Poisson’s ratios of Chinese fir wood
Articles in the same Issue
- Frontmatter
- Original Articles
- Preparation of prehydrolysis-TMPs with different severity factors and analysis of the pulps and byproducts
- Differences in solubility parameters and susceptibility to salting-out between softwood and hardwood lignosulfonates
- Modified sodium lignosulfonates (NaLS) with straight chain alcohols and their aggregation behavior and adsorption characteristics on solid surfaces
- Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage
- Semitransparent, durable superhydrophobic polydimethylsiloxane/SiO2 nanocomposite coatings on varnished wood
- Comparative study of the topochemistry on delignification of Japanese beech (Fagus crenata) in subcritical phenol and subcritical water
- Characterisation of Postia placenta colonisation during 36 weeks in acetylated southern yellow pine sapwood at three acetylation levels including genomic DNA and gene expression quantification of the fungus
- Relation of transverse compression properties and the degree of brown rot biodeterioration of Pinus glabra in the soil block test
- Four-point bending strength of key-hole side-edge-notched western hemlock (Tsuga heterophylla) wood
- Determination of the elasto-plastic material characteristics of Norway spruce and European beech wood by experimental and numerical analyses
- Time dependence of the orthotropic compression Young’s moduli and Poisson’s ratios of Chinese fir wood
