Advances in the study of mechanical properties and constitutive law in the field of wood research

Zhao, Shi Yang; Zhao, Jianxin; Han, Geng

doi:10.1088/1757-899x/137/1/012036

Cited by 10 publications

(6 citation statements)

References 35 publications

(22 reference statements)

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“…Îòìå÷àåòñÿ òàêaeå ñóùåñòâåííîå âëèÿíèå ñêîðîñòè äåôîðìàöèè íà äåôîðìàöèîííûå è ïðî÷íîñòíûå õàðàêòåðèñòèêè äðåâåñèíû. Òàê, èñõîäÿ èç äàííûõ [12], ìàêñèìàëüíîå íàïðÿaeåíèå â îáðàçöàõ èç ïðîáêîâîãî äåðåâà (balsa wood) ïðè îäíîîñíîì ñaeàòèè óâåëè÷èâàåòñÿ â 1,75 ðàçà ïðè âîçðàñòàíèè ñêîðîñòè äåôîðìàöèè îò 10 -3 äî 10 2 ñ -1 è åùå â 1,3 ðàçà ïðè äàëüíåéøåì óâåëè÷åíèè ñêîðîñòè äåôîðìàöèè äî 3000 ñ -1 . Â ñòàòüå [13] íà ïðèìåðå ìîäåëèðîâàíèÿ ïðîöåññà èíäåíòèðîâàíèÿ êîíóñîâ ñ ðàçëè÷íûìè óãëàìè ðàñòâîðà â îáðàçöû èç ïðîáêîâîãî äåðåâà ïîêàçàíî, ÷òî ó÷åò àíèçîòðîïèè ñâîéñòâ ÿâëÿåòñÿ îáÿçàòåëüíûì óñëîâèåì äëÿ ïîëó÷åíèÿ ðåàëèñòè÷íûõ ðåçóëüòàòîâ.…”

Section: ââåäåíèåunclassified

“…Â ìèðå àêòèâíî âåäåòñÿ ðàçðàáîòêà ìîäåëåé äåôîðìèðîâàíèÿ è ðàçðóøåíèÿ äðåâåñèíû, êîòîðûå ìîãóò èñïîëüçîâàòüñÿ â ðàçëè÷íûõ ðàñ÷åòíûõ êîìïëåêñàõ äëÿ ìîäåëèðîâàíèÿ ïîâåäåíèÿ òåõíè÷åñêè ñëîaeíûõ êîíñòðóêöèé, èìåþùèõ â ñâîåì ñîñòàâå ýëåìåíòû èç äðåâåñèíû [12,13,[15][16][17]. Îñíîâîïîëàãàþùàÿ ìîäåëü äëÿ äåðåâà èçó÷àëàñü â òå÷åíèå ìíîãèõ ëåò.…”

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Influence of Increased Temperature on the Dynamic Properties of Aspen

Bragov

Konstantinov²,

Lomunov

et al. 2021

PSP

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As a damping material in the structures of containers for the transportation of hazardous materials, along with plastic metals, fiber-claydite concrete and synthetic foams, it is proposed to use wood of different species. Since containers are transported in different climate regimes, there is an urgent need to study the properties of wood at elevated temperatures. The paper presents the results of dynamic tests of aspen under uniaxial compression under conditions of temperature increased to +60°C. The tests were carried out according to the Kolsky method on a Hopkinson split-bar setup. To study the anisotropy of properties, aspen samples were made and tested by cutting samples along and across the direction of the grains. As a result of processing the experimental data, dynamic stress-strain curves were obtained. According to the experimental data, there are determined the stresses at which the integrity of the samples were violated. The mean values of the moduli of deformation in the active loading regions of stress-strain curves are also presented. The highest slope of the load sections and the highest breaking stresses were observed for the specimens when loaded along the grains, and the smallest values of these parameters were noted when loaded across the grains. For specimens loaded along grains at strain rates above 1500 s–1, after reaching the limiting stress values, a decrease (relaxation) of stresses is observed with increasing deformations. For specimens loaded across the grains, an almost horizontal section the diagrams of deforming or even with some strengthening is more typical. The effect of elevated temperature on the strength and deformation properties of aspen is estimated. There is a tendency towards some decrease in the diagrams at a temperature of +60 °C in comparison with the diagrams at room temperature. In this case, both the moduli in the loading and unloading sections and the limiting (breaking) stresses decrease. The obtained features of the behavior of aspen specimens at elevated temperatures should be taken into account when modeling deforming wood.

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Section: ââåäåíèåunclassified

Influence of Increased Temperature on the Dynamic Properties of Aspen

Bragov

Konstantinov²,

Lomunov

et al. 2021

PSP

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“…The anisotropic structure causes wood to behave differently under different types of loads, such as bending, tension, and compression. This can lead to various problems in engineering applications and structural designs (Zhao et al 2016). Such challenges require the development of various methods for processing and preserving wooden materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of climate and wood type on elastic modulus of heat-treated wood and its optimization by the Taguchi method

Gunes,

Ersin,

Altunok

2024

BioRes

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Wood, as the oldest building material, provides some of the basic needs of human beings, including shelter and protection. Wood is used in exterior cladding, carrier systems, joinery, ceiling-floor coverings, windows, doors, and furniture production. When wooden material is exposed to external weather conditions, due to its hygroscopic structure, its physical and mechanical properties deteriorate from exposure to moisture, temperature, and biological organisms. The bending modulus of elasticity of Scots pine (Pinus sylvestris L.), oak (Quercus petraea L.), and chestnut (Castanea sativa M.) wood that was tannin-impregnated and heat-treated at 160 °C, was investigated using Taguchi L9 (33). The sequence was optimized. After heat treatment, the carrier elements were subjected to artificial climate conditions. In the optimization of the data obtained, it was understood that the highest impact factor was the tree type. In contrast, the climate on the elastic modulus was the lowest impact factor. In Taguchi analysis, a mathematical prediction model was created using actual and predicted data using the S/N ratio’s biggest-best equation. The R2 of the model can be predicted with an accuracy rate of 98.6%.

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“…To date, extensive works on the processing parameters have been reported on the sintering temperature, compacting pressure, the volume fraction of pore‐making agents, size and shape of pore‐making agents [14–18]. So far, high‐temperature sintering has been commonly used in the sintering treatment of porous Mg‐based foams; high‐temperature sintering can result in high foam strength, especially when the sintering treatment is performed in a liquid state [19]. If the sintering temperature exceeds the eutectic temperature, the magnesium alloy foams may experience local melting and liquid oozing.…”

Section: Introductionmentioning

confidence: 99%

Reactive sintering principle and compressive properties of porous AZ91 magnesium alloy foams produced by powder metallurgy approach

Agbedor

Yang

Chen

et al. 2022

Materialwissenschaft Werkst

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Porous magnesium alloy foams have gained tremendous interest from scientists because of their super lightweight, unique mechanical and physical properties. Despite numerous studies suggesting these advanced materials for structural and functional applications, their manufacturing processes remain poorly understood. In this paper, the porous Mg‐9 wt. %Al‐1 wt. % Zn alloy foam was prepared through the reactive sintering principle (i. e. the element metal powder reaction principle) by using the powder metallurgical method that is combined with a pore‐making agent. The chemical and phase compositions of the cell wall microstructure were investigated by X‐ray diffraction and scanning electron microscope equipped with energy dispersive spectrometer. The compressive properties of the foams were evaluated by quasi‐static compression testing. The results of the analysis reveal that low‐temperature sintering can produce qualitative magnesium alloy foams with good mechanical properties by taking advantage of the intermetallic/or intermediate compounds which are formed in the cell wall through metal elements powder diffusion and reaction. Particularly, the foam samples sintered at 380 °C for 12 h gave the best compressive properties owing to the alloy intermetallic contents and the relative density of the foams.

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Advances in the study of mechanical properties and constitutive law in the field of wood research

Cited by 10 publications

References 35 publications

Influence of Increased Temperature on the Dynamic Properties of Aspen

Influence of Increased Temperature on the Dynamic Properties of Aspen

Effect of climate and wood type on elastic modulus of heat-treated wood and its optimization by the Taguchi method

Reactive sintering principle and compressive properties of porous AZ91 magnesium alloy foams produced by powder metallurgy approach

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