Orthotropic mechano-sorptive creep behavior of Chinese fir during the moisture adsorption process determined in tensile mode via dynamic mechanical analysis (DMA)
-
Hui Peng
,
Jianxiong Lu
Abstract
The orthotropic viscoelastic creep (VEC) at a constant moisture content (MC) and mechano-sorptive creep (MSC) during the adsorption process were examined for Chinese fir (Cunninghamia lanceolata) under tension at 20, 40, 60 and 80% relative humidity (RH) (30°C). Free swelling was performed on matched specimens based on the strain partition assumption to better understand the characteristics of the mechano-sorptive (MS) phenomenon. Expansion, elastic and time-dependent creep behaviors of radial (R) and tangential (T) specimens were affected by the MC to a higher degree than those of the longitudinal (L) specimen. A higher proportion of elastic strain in total strain was found in the L specimen as compared with transverse specimens, regardless of VEC and MSC. The RH level had a greater effect on relaxation behavior in the L specimen for MSC. According to the three tests, expansion mainly dominated the creep strain during adsorption, especially for the L specimen. The MS strain exerted more influence on transverse specimens and had less contribution to the L specimen. Moreover, under all RH isohume (RHI) conditions, the unstable state contributed to MS strain diminishing as MC approached equilibrium moisture content (EMC). A shorter adsorption time to a new equilibrium state was achieved at the expense of intensifying the unstable state of the wood cell wall.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This research was sponsored by the Fundamental Research Funds of Chinese Academy of Forestry (CAFYBB2017QB005) and the National Natural Science Foundation of China, Funder Id: 10.13039/501100001809 (31570548).
Employment or leadership: None declared.
Honorarium: None declared.
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Editorials
- Editorial changes at Holzforschung
- Goodbye to Holzforschung
- Thanks to Oskar Faix
- Original Articles
- Orthotropic mechano-sorptive creep behavior of Chinese fir during the moisture adsorption process determined in tensile mode via dynamic mechanical analysis (DMA)
- Differences in the viscoelastic properties between earlywood and latewood in the growth rings of Chinese fir as analyzed by dynamic mechanical analysis (DMA) in the temperature range between −120°C and 120°C
- Failure conditions of solid wood on off-axis compression testing
- Effect of knots and holes on the modulus of elasticity prediction and mapping of sugi (Cryptomeria japonica) veneer using near-infrared hyperspectral imaging (NIR-HSI)
- Quantification of slip planes in the stem wood of Eucalyptus grandis
- DNA barcoding authentication for the wood of eight endangered Dalbergia timber species using machine learning approaches
- Chemical analysis and antioxidant activities of bark extracts from four endemic species of Hyrcanian forests in Iran
- Isolation of natural flavoring compounds from cooperage woods by pressurized hot water extraction (PHWE)
- Volatile organic compounds (VOCs) from lauan (Shorea ssp.) plyboard prepared with kraft lignin, soy flour, gluten meal and tannin: emissions during hot pressing and from panels as a function of time
- Plasma treatment of plastic film or decorative veneer and its effects on the peel strength and curling deformation of plastic film-reinforced pliable decorative sliced veneer (PR-RP-DSV)
Artikel in diesem Heft
- Frontmatter
- Editorials
- Editorial changes at Holzforschung
- Goodbye to Holzforschung
- Thanks to Oskar Faix
- Original Articles
- Orthotropic mechano-sorptive creep behavior of Chinese fir during the moisture adsorption process determined in tensile mode via dynamic mechanical analysis (DMA)
- Differences in the viscoelastic properties between earlywood and latewood in the growth rings of Chinese fir as analyzed by dynamic mechanical analysis (DMA) in the temperature range between −120°C and 120°C
- Failure conditions of solid wood on off-axis compression testing
- Effect of knots and holes on the modulus of elasticity prediction and mapping of sugi (Cryptomeria japonica) veneer using near-infrared hyperspectral imaging (NIR-HSI)
- Quantification of slip planes in the stem wood of Eucalyptus grandis
- DNA barcoding authentication for the wood of eight endangered Dalbergia timber species using machine learning approaches
- Chemical analysis and antioxidant activities of bark extracts from four endemic species of Hyrcanian forests in Iran
- Isolation of natural flavoring compounds from cooperage woods by pressurized hot water extraction (PHWE)
- Volatile organic compounds (VOCs) from lauan (Shorea ssp.) plyboard prepared with kraft lignin, soy flour, gluten meal and tannin: emissions during hot pressing and from panels as a function of time
- Plasma treatment of plastic film or decorative veneer and its effects on the peel strength and curling deformation of plastic film-reinforced pliable decorative sliced veneer (PR-RP-DSV)
