Compression strength-focused properties of wood composites induced by structure

Compression strength-focused properties of wood composites induced by structure. The aim of the following study was to examine the contractual compression strength and modulus of elasticity when compressing (MOEC) of three different wood composites with various structure types: softwood (coniferous) plywood, OSB and laminated particleboard 24 mm thick. The biggest MOEC value was performed by the particleboard laminated 24 mm MOEC equalling 70.00 N/mm2. The second was found by the OSB panels, equalling 63.03 N/mm2. Last, but with MOEC value close to OSB, was softwood plywood with MOEC of 62.44 N/mm2. The lowest compression strength was observed by OSB samples, with a value of 2.75 N/mm2. The second lowest value has been performed by coniferous plywood (2.80 N/mm2). The highest compression strength occurred by the particleboard laminated 24 mm, equalling 3.31 N/mm2. Density shares and density profiles of the samples were also analysed, all of the examined composites performed U-shaped density profile The results of the study showed that there is no significant correlation between density and obtained parameters under compression. Observation of density share let the Authors conclude conversely than the results showed. It is supposed that the key factor affecting the compression performance of samples was the adhesive area and solid glue content within the composites. It is assumed that the bigger total contact surface of wood particles coated with adhesive resin, so the sum of the effective (gluing particles) surfaces of the adhesive joint is the better mechanical properties can be performed. This is why the laminated particleboard gave the best mechanical properties, while the worst were observed by the softwood plywood.

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Extrusion of MOC-Based Panel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.400-402.263 ◽

2008 ◽

Vol 400-402 ◽

pp. 263-267

Author(s):

Xiang Yu Li ◽

Hui Su Chen ◽

Chung Kong Chau ◽

Zong Jin Li

Keyword(s):

Mechanical Properties ◽

Cross Sections ◽

Chloride Solution ◽

Extrusion Process ◽

Wood Composites ◽

Magnesium Chloride Solution ◽

Wood Particles ◽

Magnesium Oxychloride ◽

Magnesium Oxychloride Cement ◽

Extrusion Technology

Magnesium Oxychloride Cement (MOC) is an air-hardened material with chemical reaction between magnesium oxide and magnesium chloride solution. It has many properties superior to Portland cement. It does not need wet curing, has very good fire resistance, low thermal conductivity. In this study, wood composites were developed by using MOC as binder and wood powders as filler. It was demonstrated that MOC was suitable for binding wood particles in large quantities. In order to ensure smooth extrusion process, additives and rheological modifiers were used to modify the rheology behaviors and properties of the mixture and the rheology behaviors of fresh materials were also investigated with upsetting and relaxation tests simultaneously. Then MOC-based panels with different cross-sections were produced by using extrusion technology and mechanical properties of them were investigated.

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Compression strength and other mechanical properties of particleboards induced by density

Annals of WULS, Forestry and Wood Technology ◽

10.5604/01.3001.0014.4413 ◽

2020 ◽

Vol 110 ◽

pp. 79-91

Author(s):

Aleksandra Jeżo ◽

Grzegorz Kowaluk

Keyword(s):

Mechanical Properties ◽

Density Profile ◽

Surface Finish ◽

Compression Strength ◽

Modulus Of Elasticity ◽

Physical Characteristics ◽

Modulus Of Rupture

Compression strength and other mechanical properties of particleboards induced by density. The aim of the paper was to investigate the contractual compression strength and modulus of elasticity under compression of six types of commercially available particleboards of various thickness, density and surface finish. The basic mechanical and physical characteristics of the tested panels (modulus of elasticity and modulus of rupture during bending, density and density profile) were also performed. The studies showed that the compression strength raises linearly with panels’ density raise, and the modulus of elasticity under compression is linearly opposite, depending on the panels’ density.

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Compression strength-focused properties of wood composites induced by density

Annals of WULS, Forestry and Wood Technology ◽

10.5604/01.3001.0015.6689 ◽

2021 ◽

Vol 116 ◽

pp. 96-110

Author(s):

Grzegorz Kowaluk ◽

Aleksandra Jeżo

Keyword(s):

Surface Finish ◽

Compression Strength ◽

Modulus Of Elasticity ◽

Density Structure ◽

Wood Composites ◽

Density Profiles ◽

Significant Dependence

Compression strength-focused properties of wood composites induced by density. The aim of this study was to analyse the contractual compression strength and modulus of elasticity under compression of ten commercially available wood composites of various thickness, density, structure and surface finish. Density and density profiles have also been performed. The tests showed that there is no significant dependence of the compression strength and MOEC on the density of composites.

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The Potential Use of Seaweed (Posidonia oceanica) as an Alternative Lignocellulosic Raw Material for Wood Composites Manufacture

Coatings ◽

10.3390/coatings11010069 ◽

2021 ◽

Vol 11 (1) ◽

pp. 69

Author(s):

Ekaterini Rammou ◽

Andromachi Mitani ◽

George Ntalos ◽

Dimitrios Koutsianitis ◽

Hamid R. Taghiyari ◽

...

Keyword(s):

Mechanical Properties ◽

Posidonia Oceanica ◽

Raw Material ◽

Lignocellulosic Materials ◽

Wood Composites ◽

Thickness Swelling ◽

Composites Manufacturing ◽

Wood Particles ◽

Slow Growing ◽

Potential Use

A big challenge in the composites industry is the availability of cheap raw lignocellulosic materials, potential candidates to replace slow growing trees, in order to minimize the production cost. Therefore, a variety of plants were studied and tested worldwide in composites manufacturing. The objective of this study was to investigate the technical feasibility of manufacturing particleboards from seaweed leaves (Possidonia oceanica—PO). The use of such a material may benefit both socioeconomic and environmental development since these leaves settle on seashores and decay. The results showed that an incorporation of up to 10% PO leaves did not significantly affect the mechanical properties of the board. Internal bond strength was more severely affected than the other mechanical properties. The incorporation of PO leaves up to 25% did not significantly improve the dimensional stability of the boards. Markedly, boards made from 50% wood particles and 50% PO leaves showed the best thickness swelling values. It is suggested that higher resin dosage and an alternative resin system, such as isocyanates, may improve the panel properties.

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Enhancement of the properties of hybrid woods polymer composites by chemical pre-treatments

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420720980033 ◽

2020 ◽

pp. 146442072098003

Author(s):

Mohammad ZR Khan ◽

Sunil Kumar Srivastava ◽

MK Gupta

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Water Resistance ◽

Treated Wood ◽

Wood Composites ◽

X Ray Diffraction ◽

Absorption Properties ◽

Shorea Robusta ◽

Wood Particles ◽

Maximum Water

The present work aims to enhance the mechanical properties, thermal stability, and water resistance behavior of hybrid Pinus/Shorea robusta wood particles reinforced epoxy composites employing the chemical pre-treatments. The hybrid wood composites were prepared by hand lay-up method keeping a constant of 25 wt% of wood particles concentration with equal proportions of Pinus and Shorea robusta wood particles. The performance of the hybrid wood composite was improved by improving the interfacial bonding between wood particles and epoxy resin by chemical pre-treatments of the wood particles using silane (APTES) with varying concentrations of 2, 4, and 6 wt% and alkali (NaOH) with varying concentrations of 5%, 10%, and 15%. The mechanical properties (namely, tensile, flexural, impact, and microhardness) and water absorption properties (namely, maximum water uptake and sorption, diffusion, and permeability coefficients) of the prepared hybrid wood composites were measured. The investigations include the study of thermal degradation and crystalline behavior using thermogravimetric analysis and X-ray diffraction analysis, respectively. It was observed that the mechanical properties, thermal stability, and water resistance and crystalline behavior of the hybrid wood composites were significantly enhanced after these pre-treatments. Further, it was concluded that silane pre-treated hybrid composite with 6 wt% concentration provided the best performance than untreated as well as alkali pre-treated wood composites.

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Effect of Titanium Carbide Particles on Mechanical Properties of Aluminum Matrix Composites

Wasit Journal of Engineering Sciences ◽

10.31185/ejuow.vol5.iss2.55 ◽

2017 ◽

Vol 5 (2) ◽

pp. 20-30

Author(s):

Zaman Khalil Ibrahim

Keyword(s):

Mechanical Properties ◽

Titanium Carbide ◽

Compression Strength ◽

Volume Fraction ◽

Aluminum Matrix ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Powder Metallurgy Technique ◽

Carbide Particles ◽

Properties Of Composites

In this research aluminum matrix composites (AMCs) was reinforced by titanium carbide (TiC) particles and was produced. Powder metallurgy technique (PM) has been used to fabricate AMCs reinforced with various amounts (0%, 4%, 8%, 12%, 16% and 20% volume fraction) of TiC particles to study the effect of different volume fractions on mechanical properties of the Al-TiC composites. Measurements of compression strength and hardness showed that mechanical properties of composites increased with an increase in volume fraction of TiC Particles. Al-20 % vol. TiC composites exhibited the best properties with hardness value (97HRB) and compression strength value (275Mpa).

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Influence of Gating System Parameters of Die-Cast Molds on Properties of Al-Si Castings

Materials ◽

10.3390/ma14133755 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3755

Author(s):

Štefan Gašpár ◽

Tomáš Coranič ◽

Ján Majerník ◽

Jozef Husár ◽

Lucia Knapčíková ◽

...

Keyword(s):

Mechanical Properties ◽

Computer Modelling ◽

Permanent Deformation ◽

Surface Hardness ◽

Technological Parameters ◽

Inlet System ◽

Die Cast ◽

Key Factor ◽

Fine Grained Structure ◽

Design Solutions

The resulting quality of castings indicates the correlation of the design of the mold inlet system and the setting of technological parameters of casting. In this study, the influence of design solutions of the inlet system in a pressure mold on the properties of Al-Si castings was analyzed by computer modelling and subsequently verified experimentally. In the process of computer simulation, the design solutions of the inlet system, the mode of filling the mold depending on the formation of the casting and the homogeneity of the casting represented by the formation of shrinkages were assessed. In the experimental part, homogeneity was monitored by X-ray analysis by evaluating the integrity of the casting and the presence of pores. Mechanical properties such as permanent deformation and surface hardness of castings were determined experimentally, depending on the height of the inlet notch. The height of the inlet notch has been shown to be a key factor, significantly influencing the properties of the die-cast parts and influencing the speed and filling mode of the mold cavity. At the same time, a significant correlation between porosity and mechanical properties of castings is demonstrated. With the increasing share of porosity, the values of permanent deformation of castings increased. It is shown that the surface hardness of castings does not depend on the integrity of the castings but on the degree of subcooling of the melt in contact with the mold and the formation of a fine-grained structure in the peripheral zones of the casting.

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Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Materials ◽

10.3390/ma14071767 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1767

Author(s):

Yuhong Jiao ◽

Jianfeng Zhu ◽

Xuelin Li ◽

Chunjie Shi ◽

Bo Lu ◽

...

Keyword(s):

Mechanical Properties ◽

Matrix Composite ◽

Compression Strength ◽

Casting Process ◽

Al Alloy ◽

Pyrolysis Process ◽

Alloy Matrix ◽

Al Matrix Composite ◽

Al Matrix

Al matrix composite, reinforced with the in situ synthesized 3C–SiC, MgAl2O4, and MgO grains, was produced via the casting process using phenolic resin pyrolysis products in flash mode. The contents and microstructure of the composites’ fracture characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Mechanical properties were tested by universal testing machine. Owing to the strong propulsion formed in turbulent flow in the pyrolysis process, nano-ceramic grains were formed in the resin pyrolysis process and simultaneously were homogeneously scattered in the alloy matrix. Thermodynamic calculation supported that the gas products, as carbon and oxygen sources, had a different chemical activity on in situ growth. In addition, ceramic (3C–SiC, MgAl2O4, and MgO) grains have discrepant contents. Resin pyrolysis in the molten alloy decreased oxide slag but increased pores in the alloy matrix. Tensile strength (142.6 ± 3.5 MPa) had no change due to the cooperative action of increased pores and fine grains; the bending and compression strength was increasing under increased contents of ceramic grains; the maximum bending strength was 378.2 MPa in 1.5% resin-added samples; and the maximum compression strength was 299.4 MPa. Lath-shaped Si was the primary effect factor of mechanical properties. The failure mechanism was controlled by transcrystalline rupture mechanism. We explain that the effects of the ceramic grains formed in the hot process at the condition of the resin exist in mold or other accessory materials. Meanwhile, a novel ceramic-reinforced Al matrix was provided. The organic gas was an excellent source of carbon, nitrogen, and oxygen to in situ ceramic grains in Al alloy.

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Toward constraining Saturn's rotation rate by interior modeling

10.5194/egusphere-egu21-6442 ◽

2021 ◽

Author(s):

Nadine Nettelmann ◽

Jonathan J. Fortney

Keyword(s):

Broad Spectrum ◽

Rotation Rate ◽

Rotation Period ◽

Outer Planet ◽

Fall Meeting ◽

Density Profiles ◽

A Value ◽

Periodic Signals ◽

Under Construction ◽

Even Harmonics

The rotation rate of the outer planet Saturn is not well constrained by classical measurements of periodic signals [1]. Recent and diverse approaches using a broad spectrum of Cassini and other observational data related to shape, winds, and oscillations are converging toward a value about 6 to 7 minutes faster than the Voyager rotation period. Here we present our method of using zonal wind data and the even harmonics&#160;J2 to J10 measured during the Cassini Grand Finale tour [2] to infer the deep rotation rate of Saturn. We assume differential rotation on cylinders and generate adiabatic density profiles that match the low-order J2 and J4 values. Theory of Figures to 7th order is applied to estimate the differences in the high-order moments J6 to J10 that may result from the winds and the assumed reference rotation rate. Presented results are preliminary as the method is under construction [3].[1] Fortney, Helled, Nettelmann et al, in: 'Saturn in the 21st century', Cambridge U Press (2018) [2] Iess, Militzer, Kaspi, Science 364:2965 (2019) [3] Nettelmann, AGU Fall Meeting, P066-0007 (2020)&#160;

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Study of the Effect of PP and LDPE Thermoplastic Binder Addition on the Mechanical Properties and Physical Properties of Particulate Composites for Building Material Application

Materials Science Forum ◽

10.4028/www.scientific.net/msf.964.115 ◽

2019 ◽

Vol 964 ◽

pp. 115-123

Author(s):

Sigit Tri Wicaksono ◽

Hosta Ardhyananta ◽

Amaliya Rasyida ◽

Feisha Fadila Rifki

Keyword(s):

Mechanical Properties ◽

Compression Strength ◽

Building Materials ◽

Construction Material ◽

Construction Materials ◽

Physical And Mechanical Properties ◽

Waste Recycling ◽

Plastic Waste ◽

Particulate Composites ◽

Water Absorbability

Plastic waste is majority an organic material that cannot easily decomposed by bacteria, so it needs to be recycled. One of the utilization of plastic waste recycling is become a mixture in the manufacture of building materials such as concrete, paving block, tiles, roof. This experiment purpose to find out the effect of addition of variation of LDPE and PP thermoplastic binder to physical and mechanical properties of LDPE/PP/Sand composite for construction material application. In this experiment are using many tests, such are SEM, FTIR, compression strength, density, water absorbability, and hardness. the result after the test are the best composition of composite PP/LDPE/sand is 70/0/30 because its have compression strength 14,2 MPa, while density value was 1.30 g/cm3, for the water absorbability is 0.073%, and for the highest hardness is 62.3 hardness of shore D. From the results obtained, composite material can be classified into construction materials for mortar application S type with average compression strength is 12.4 MPa.

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