Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

Chuchała, Daniel; Sandak, Jakub; Orłowski, Kazimierz A.; Muzinski, T; Lackowski, M.; Ochrymiuk, Tomasz

doi:10.3390/ma13204692

Cited by 13 publications

(12 citation statements)

References 54 publications

(84 reference statements)

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“…Their results show that the fracture properties of the modified materials depend not only on density, but also on the type of modification, cell wall degradation, and the internal structure. In the work of [ 79 ], the authors focus on the various drying techniques and their influence on the fracture parameters. On the basis of their research, they conclude that an increase in the wood drying temperature and, thus, its thermal modification, lead to higher fragmentation and graininess of the resulting sawdust during machining.…”

Section: Resultsmentioning

confidence: 99%

Interaction between Thermal Modification Temperature of Spruce Wood and the Cutting and Fracture Parameters

et al. 2021

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This work examines the effect of thermal modification temperatures in the production of thermally modified wood on the cutting and fracture parameters when cutting heat-treated spruce wood by a circular sawblade machine. The samples were thermally modified at 160, 180, 200, and 220 °C. One sample was unmodified and was used as a reference sample. On the basis of the performed experiments, the fracture parameters (fracture toughness and shear yield strength) were calculated for the axial–perpendicular direction of cutting. In comparison with the theoretical assumptions, the influence of temperature on the cutting and fracture parameters was confirmed. Thermally treated wood is characterized by increased fragility and susceptibility to crack formation, as well as reduced density, bending strength, and shear strength. These properties significantly affect the size of the cutting force and feed force, as well as the fracture parameters. As the temperature increases, the values of these parameters decrease. The mentioned material characteristics could be useful for the optimization of the cutting process, as well as for the issue of energy consumption during the machining of heat-treated wood.

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Section: Resultsmentioning

confidence: 99%

Interaction between Thermal Modification Temperature of Spruce Wood and the Cutting and Fracture Parameters

et al. 2021

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“…Beltrami first found that critical energy

depends on the uniaxial yield

or torsion

. This approach also opened up the possibility of using many other forms of experimental data such as: Vigers hardness, Sharpy energy, toughness critical energy, cleavage energy, and so on (see Orłowski et al [ 22 , 23 ]).…”

Section: The Materials Effort Description By the Energy Approachmentioning

confidence: 99%

Principles of Stress-Strength Modelling of the Highly Thermally Loaded Materials—The Influence of an Effect of Strength Differential on the Material Effort

et al. 2021

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This paper presents an improvement in the Huber–Mises–Hencky (HMH) material effort hypothesis proposed by Burzyński. Unlike the HMH hypothesis, it differentiates the plastic effort between compression and tensile load states, and links shear with tensile limit. Furthermore, it considers the fact that construction materials do not have infinite resistance in the pure tensile hydrostatic load state, which was proved by the static load experiment performed on St12T heat-resistant steel. The asymmetry between tensile and compressive loads is captured by the elastic region asymmetry coefficient ϰ, which was established by experiment for St12T steel in the temperature range between 20 °C and 800 °C.

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“…Razavi and Berto [ 52 ] proposed a new fixture for fracture testing under mixed-mode I/II/III loading. Chuchala et al [ 53 ] determined the critical-stress-intensity factor and shear yield stress for pine and beech woods based on the cutting machine’s power signal. In addition, they investigated four different drying methods and showed that the drying method has a meaningful effect on the critical-stress-intensity factor and shear yield stress.…”

Section: Introductionmentioning

confidence: 99%

Tensile-Tearing Fracture Analysis of U-Notched Spruce Samples

et al. 2022

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Spruce wood (Picea Mariana) is a highly orthotropic material whose fracture behavior in the presence of U-shaped notches and under combined tensile-tearing loading (so-called mixed-mode I/III loading) is analyzed in this work. Thus, several tests are carried out on U-notched samples with different notch tip radii (1 mm, 2 mm, and 4 mm) under various combinations of loading modes I and III (pure mode I, pure mode III, and three mixed-mode I/III loadings), from which both the experimental fracture loads and the fracture angles of the specimens are obtained. Because of the linear elastic behavior of the spruce wood, the point stress (PS) and mean stress (MS) methods, both being stress-based criteria, are used in combination with the Virtual Isotropic Material Concept (VIMC) for predicting the fracture loads and the fracture angles. By employing the VIMC, the spruce wood as an orthotropic material is modeled as a homogeneous and isotropic material with linear elastic behavior. The stress components required for calculating the experimental values of notch stress intensity factors are obtained by finite element (FE) analyses of the test configuration using commercial FE software from the fracture loads obtained experimentally. The discrepancies between the experimental and theoretical results of the critical notch stress intensity factors are obtained between −12.1% and −15% for the PS criterion and between −5.9% and −14.6% for the MS criterion, respectively. The discrepancies related to fracture initiation angle range from −1.0% to +12.1% for the PS criterion and from +1.5% to +12.2% for the MS criterion, respectively. Thus, both the PS and MS models have good accuracy when compared with the experimental data. It is also found that both failure criteria underestimate the fracture resistance of spruce wood under mixed-mode I/III loading.

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Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

Cited by 13 publications

References 54 publications

Interaction between Thermal Modification Temperature of Spruce Wood and the Cutting and Fracture Parameters

Interaction between Thermal Modification Temperature of Spruce Wood and the Cutting and Fracture Parameters

Principles of Stress-Strength Modelling of the Highly Thermally Loaded Materials—The Influence of an Effect of Strength Differential on the Material Effort

Tensile-Tearing Fracture Analysis of U-Notched Spruce Samples

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