Frequency-dependent viscoelastic properties of Chinese fir (<i>Cunninghamia lanceolata</i>) under hygrothermal conditions. Part 1: moisture adsorption

Zhan, Tianyi; Jiang, Jiali; Lu, Jianxiong; Zhang, Yaoli; Chang, Jianmin

doi:10.1515/hf-2018-0208

Cited by 13 publications

(3 citation statements)

References 54 publications

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“…The found scaling of horizontal shift factors a T with T g /T is also in line with various studies on time-temperature-moisture superposition (Fabre et al, 2018;Ishisaka et al, 2004;Krauklis et al, 2019;Patankar et al, 2008;Zhan et al, 2019;Zhang et al, 2020). This superposition is found for materials, where hydrogen bonding is important, such as wood, polyelectrolytes, polyamides, and epoxies.…”

Section: Discussionsupporting

confidence: 89%

Scaling relations in rheology of concentrated starches and maltodextrins

et al. 2022

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Section: Discussionsupporting

confidence: 89%

Scaling relations in rheology of concentrated starches and maltodextrins

et al. 2022

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“…However, the difference between 4 MPa and 7 MPa did not exceed 1%. At this stage, the BBS was subjected to a substantial external force, the bamboo cell walls were easily crushed, and the bundles were brittle, negatively impacting the physical properties of the bamboo scrimber [39,51]. ANOVA results indicated that the hot-press pressure exhibited a highly significant effect on the expansion rate of the water absorption thickness of bamboo scrimber (Table 4).…”

Section: Effect Of Hot-pressing Pressure On the Bbs Temperature And V...mentioning

confidence: 99%

Changes in Temperature and Vapor-Pressure Behavior of Bamboo Scrimber in Response to Hot-Pressing Parameters

Ge,

Lu,

et al. 2024

Forests

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This study investigated the heat-transfer behavior of heat-treated and phenolic resin-impregnated bamboo bundle slabs during the hot-pressing process. The significance of these findings lies in their potential to drive advancements in hot-pressing technology, contribute to energy-conservation efforts, and facilitate emission reduction within the bamboo scrimber industry. In this study, the variations in temperature and vapor pressure were investigated during the hot-pressing of bamboo slabs under various conditions, including hot-pressing temperatures (140 °C, 150 °C, 160 °C, and 170 °C), hot-pressing holding times (15 min, 20 min, 25 min, and 30 min), and hot-pressing pressures (4 MPa, 5 MPa, 6 MPa, and 7 MPa). This was achieved using thermocouple sensors and a self-made vapor pressure-monitoring system. The results indicated that higher hot-pressing temperatures significantly increased the heating rate, peak temperature, and core-layer vapor peak pressure of the bamboo bundle slab, with the vapor peak pressure at 170 °C being twice that at 140 °C. Furthermore, extending the holding time had a lesser effect on increasing the peak temperature of the slab but significantly increased the peak vapor pressure in the core layer. Thus, increasing the hot-pressing pressure proved beneficial for slab heating but had a lesser effect on the surface and core-layer peak temperatures. The core-layer vapor pressure of the slab subjected to a hot-press pressure of 7 MPa was 1.8 times higher than that at 4 MPa.

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“…A numerical simulation of creep behaviors have to be known. Numerous investigations have been conducted by considering the MS characteristics of wood and wood composites [3,[7][8][9][10][11][12][13]. However, only few MS properties were observed for a given property-MC combination.…”

Section: Introductionmentioning

confidence: 99%

Orthotropic hygro-mechanical behavior of Chinese fir during cyclical relative humidity variation

Peng

Jiang

et al. 2020

J Wood Sci

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The orthotropic free swelling-shrinkage and mechano-sorptive creep (MSC) during cyclical relative humidity (RH) variation (0-80% RH) and time-dependent viscoelastic creep (VEC) in a steady state (0% RH) were examined in Chinese fir (Cunninghamia lanceolata). During RH changing, the occurrences of local maximum or minimum strains of the free swelling-shrinkage and MSC lagged behind the corresponding maximum or minimum RH. The lagged time decreased with increasing cyclical times. Furthermore, the lagged time exhibited an orthotropic behavior: the longer lagged time was found in longitudinal specimen compared to transverse specimens. MSC exhibited a more pronounced anisotropy than VEC. According to the three tests, the performance of free swelling-shrinkage and the mechano-sorptive effect on the orthotropic MSC behavior was addressed. The free swelling-shrinkage mainly dominated the creep strain during cyclic RH variation, especially for longitudinal specimen. The mechano-sorptive effect on the MSC behavior exerted more influence on tangential specimen compared to radial and longitudinal specimens. The mechano-sorptive limit was observed for all specimens. Longitudinal specimen required more cyclic times to approach the mechano-sorptive limit than transverse specimens.

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Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 1: moisture adsorption

Cited by 13 publications

References 54 publications

Scaling relations in rheology of concentrated starches and maltodextrins

Scaling relations in rheology of concentrated starches and maltodextrins

Changes in Temperature and Vapor-Pressure Behavior of Bamboo Scrimber in Response to Hot-Pressing Parameters

Orthotropic hygro-mechanical behavior of Chinese fir during cyclical relative humidity variation

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