Influence of wood anisotropy on its mechanical properties in relation to the scale effect

Malaga-Toboła, U.; Łapka, Mariusz; Tabor, Sylwester; Niesłony, Adam; Findura, Pavol

doi:10.31545/intagr/110808

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…In this case, it depends on the specific type or type of the material and may only affect the mechanical or physical properties of the tested samples. Depending on the materials tested, the influence of anisotropy on the values of capillary rise, compressive strength, tensile strength, and thermal conductivity was demonstrated [ 2 , 3 , 4 , 5 , 6 ]. The influence of the anisotropy phenomenon can be observed in the materials of organic origin.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Direction of Mixture Compaction on the Selected Properties of a Hemp-Lime Composite

et al. 2021

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The aim of the research presented in the article was to check the differences in the hygro-thermal and mechanical properties of hemp-lime composites with different shives fractions, depending on the direction of mixture compaction. The research part of the paper presents the preparation method and investigation on the composites. Thermal conductivity, capillary uptake, as well as flexural and compressive strengths were examined. Additionally, an analysis of the temperature distribution in the external wall insulated with the tested composites was performed. The results confirm that the direction of compaction influences the individual properties of the composites in a similar way, depending on the size of the shives. The differences are more pronounced in the case of the composite containing longer fractions of shives. Both thermal conductivity of the material and the capillary uptake ability are lower in the parallel direction of the compaction process. Composites exhibit greater stiffness, but they fail faster with increasing loads when loaded in the direction perpendicular to compaction.

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Section: Introductionmentioning

confidence: 99%

Influence of the Direction of Mixture Compaction on the Selected Properties of a Hemp-Lime Composite

et al. 2021

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“…The MOE values exhibited slight differences across the various length groups, under same testing method, ranging from 0.6% to 4.5%. Given the inherent variability due to the anisotropy of the wood material [ 34 ], the testing results in this study are considered reliable. It was concluded that, under the same testing method, the length effect does not significantly impact the outcomes.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Major Physical and Mechanical Properties of Trembling Aspen Lumber

Wang,

Zhang,

Gong

et al. 2024

Materials

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Trembling aspen (Populus tremuloides) is one of the major species within Populus, a predominant genus of hardwoods in North America. However, its utilization has been limited to pulp and paper or wood-based composite boards. This study aimed at evaluating the major physical and mechanical properties of trembling aspen lumber, with an ultimate objective of using this species to produce engineered wood products (EWPs). The testing materials consisted of 2 × 4 (38 mm × 89 mm) trembling aspen lumber pieces in lengths of 8, 10, and 12 feet (2.44, 3.05, and 3.66 m) with two visual grades, select structural (SS) and No. 2. Machine Stress-Rated (MSR), and longitudinal stress wave (LSW), edgewise third-point bending (EWB), and axial tension tests were conducted on the lumber. It was found that, (1) by increasing the maximum knot size by a half-inch from one-quarter inch, the minimum modulus of elasticity (MOE) measured using the MSR, the mean, and the fifth-percentile ultimate tensile strength (UTS) decreased by about 8.8%, 20.1%, and 29.8%, respectively. (2) Approximately 44% of the trembling aspen lumber met the 1450f-1.3E grade for MSR lumber, and 62% qualified for the 1200f-1.2E grade. (3) There was a great potential for manufacturing cross-laminated timber (CLT) of grade E3, with a rejection rate of about 29%. (4) The mean UTS and MOE values of the SS-grade trembling aspen lumber were 22.88 MPa and 9519 MPa, respectively, being 25.5% and 11.3% lower than that of Spruce–Pine–Fir (S-P-F) lumber. The fifth-percentile UTS and MOE values were 11.57 MPa and 7404 MPa, respectively, marking a decrease of 13.3% and 1.5% compared to the S-P-F lumber. (5) The oven-dried specific gravity (SG) of the trembling aspen wood was 0.40, which was about 3.5% larger than the value provided in the Wood Handbook.

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“…To date, hardness tests have been performed mainly on vegetables or fruits containing large amounts of water and those with low water content, e.g., cereal seeds, legume plants, wood etc. [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Interestingly, this parameter has often been assessed using a conventional scale, as in the case of pomegranate ( Punica granatum L.) [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Determination of the Influence of Mechanical Properties of Capsules and Seeds on the Susceptibility to Feeding of Mononychus pubctumalbum in Endangered Plant Species Iris aphylla L. and Iris sibirica L.

Śmigała

Winiarczyk

Dąbrowska

et al. 2021

Sensors

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The aim of the study was to determine the correlation between the mechanical resistance of iris seed capsules and seeds to Mononychus punctumalbum foraging. The principal component analysis (PCA) demonstrated that the first main component referred to the variety type in 68%, and the second main component described the stage of the ontogenetic development of the plant in 26%. As indicated by the values of each parameter measured, all the parameters were found to exert a strong impact on the variability of the analyzed system. The occurrence of weevil infestation was also strongly but negatively correlated with seed wall thickness and capsule wall thickness. There was a correlation of seed max load and seed mass with the occurrence of the weevil. The analysis of the mechanical resistance of iris seed capsules (in June 9.28 N and September 6.27 N for I. sibirica and in June 6.59 N and September 2.94 N for I. aphylla) and seeds (in June 15.97 N and September 344.90 N for I. sibirica and in June 16.60 N and September 174.46 N for I. aphylla) showed significant differences between the terms and species. The PCA analysis revealed that the first variable was correlated with the occurrence of weevil foraging.

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Influence of wood anisotropy on its mechanical properties in relation to the scale effect

Cited by 15 publications

References 20 publications

Influence of the Direction of Mixture Compaction on the Selected Properties of a Hemp-Lime Composite

Influence of the Direction of Mixture Compaction on the Selected Properties of a Hemp-Lime Composite

Evaluation of Major Physical and Mechanical Properties of Trembling Aspen Lumber

Determination of the Influence of Mechanical Properties of Capsules and Seeds on the Susceptibility to Feeding of Mononychus pubctumalbum in Endangered Plant Species Iris aphylla L. and Iris sibirica L.

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