Bending Strength Values Research Articles

Impact of Sintering Conditions for a Robust Cordierite Ceramic Reinforced with Nano-Silicon Nitride

Ceramic-composite materials based on cordierite/nano-silicon nitride (Si3N4) were prepared through the sol-gel route. The sintering process of the green cordierite alone at 1300 and 1400oC forms cordierite and mullite, respectively. Sintering of green cordierite alone with/without Si3N4 at 1350oC provided cordierite and cristobalite in an ambient condition, while in nitrogen condition, it allowed the crystallization of cordierite and Si3N4 phases. The microstructures of the ceramic composites showed irregular or clustered particles containing nano-sized grains of the major cordierite that developed in all the sintered samples at 1350oC. Upon these different sintering temperatures, the bulk densities ranged between 2.255 and 2.305 g/cc in the air and 2.254 and 2.355 g/cc in nitrogen conditions. Moreover, their apparent porosities were between 13 and 17 % in the air and 12.1 and 14 % in nitrogen conditions. The values of bending strength were between 50 and 325 N/mm2. They were higher in the air than in the nitrogen condition.

Sustainable Use of Brine Water in Concrete Cement Mixes Alter Compression-Bending Strengths

Freshwater resources are limited and many regions worldwide are suffering from water shortage due to the rapid increase in population, industrialization and urbanization. Concrete production has shown to consume a substantial amount of water for mixing and curing, and this large consumption has sparked concerted efforts to find sustainable and environmental friendly alternatives for replacing freshwater in order to lower the pressure on water resources. The use of hypersaline by-product brine water discharged from desalination plant has been tested in cement mortar production in order to lower the pressure on water resources and reduce the environmental impact resulted from discharging this effluent to surrounding streams. Discharge brine water to surrounding stream can deteriorate physicochemical and ecological properties of receiving streams as well as accelerate degassing process of dissolved greenhouse gases by lowering solubility coefficient. Compression and Bending strength of cement mortar specimens have been tested after adding different percentages of brine water and with/without Alkali-Resistance Glass Fiber (ARGF). Samples have been cured for 7, 14, 21 and 28 days in 50.5mm×50.5mm×50.5mm cubes and tested using compression testing machine. Adding 3% ARGF to cement mortar mixes has increased 28 curing days bending strength (3 times) and has decreased compression strength 30%. It has been observed that using brine water with ARGF in cement mortar mixes will lower compression strength on the average of 22%±2 and will increase bending strength values 2.7 times. The results show that using ARGF and brine water in cement mortar production seems promising in improving environmental conditions and enhancing the mechanical property in many applications.

Flexural properties of visually graded southern pine 2×4 and 2×6 structural lumber

Flexural properties of visually graded southern pine structural lumber were evaluated. Several grade controlling characteristics were considered relative to bending properties and compared with current design values. A total of 751 southern pine lumber specimens were obtained from a broad spectrum of regions in the southeastern United States. Visually graded No. 2, nominally two inch thick specimens, in four and six inch widths, were obtained from commercial sawmills. All specimens were evaluated by a certified grader in the laboratory. Actual dimensions, weight, and moisture content (MC) were measured. Growth and manufacturing related characteristics were identified and classified into two categories: strength reducing characteristics (SRC) and grade reducing characteristics (GRC). Specific gravity (SG), bending modulus of elasticity (MOE), and modulus of rupture (MOR), were determined for each specimen. The presence of knots was identified as the most significant SRC; their presence had the most significant impact on SG, MOE and MOR. For GRC, specimens with knots, warp and specimens that fell into the category none, were significantly lower in SG, MOE and MOR. MOE and the allowable design bending strength values yielded in this study met the current design value criteria for both widths tested.

Lower Cretaceous Clay in Anti-Lebanon Mountains, Syria And Their Importance in Ceramic Manufacturing

Lower Cretaceous rocks are exposed only in the mountain regions of Syria, such as the Anti Lebanon mountain on the western side of Damascus. The lower cretaceous sequences are made up of different rocks. The upper and middle parts of the section are composed mainly of carbonate sediments and less frequently gypsum and anhydrite. The lower beds are mainly composed of sandstone, conglomerate and clay. Clay samples were collected from the study area, which is located about 45 km west of the city of Damascus, near the border village of Kfer Yabous and to the left of the Damascus -Beirut International Road, within the lower Cretaceous upper Aptian deposits. The properties of clay were carried out by X-ray diffraction (XRD) and, X-ray fluorescence (XRF) and Thermal Analysis (DTA-TG-DSC) techniques. The studied clay samples are mainly composed of kaolinite, quartz, mica-illite and same feldspar. Chemical analysis shows a content of SiO2 that varies from 46.06 to 73 % and Al2 O3 between 14.55 and 26.56 %. Total content of staining oxides (Fe2 O3 + TiO2 ) is between 4.3 and 12.5 %. The physical properties were determined by studying their behavior before and after firing. They showed low bending strength values (22.5 kg/cm²) after drying, and after firing at 1180°C (about 247 kg/cm²). Water absorption value at 1180 °C was about 10 %. The coefficient thermal expansion coefficient (CTE) at 1140°C was 2,137 x 10-5 All obtained results confirm the suitability of this clay for the ceramic industry

Determination of changes in the mechanical and color properties of some wood species treated with shellac

The properties of wood, which is a natural and sustainable substance, change under biotic and abiotic factors. Different methods along with chemical/natural substances are used to extend the service life of wood and increase its performance under different conditions. Shellac is a natural product secreted by insects onto host trees. It is used extensively as a coating, especially in the food and pharmaceutical industries. Its natural properties and biocompatibility increase the areas where it is used. This study investigated the effects on the physical and mechanical properties of pine, beech, and fir species impregnated with shellac solutions at different concentrations (1%, 3%, and 5%) and sodium hydroxide (NaOH). The study found that 10% NaOH solution caused significant decreases in the bending strength values. The highest bending strength values were obtained for the Scots pine and fir woods at 5% shellac concentration and for the beech wood at 1% concentration. The highest modulus of elasticity (MOE) values were reached at 1% shellac concentration in all three tree species. Although the lightness (L*) of the wood samples decreased with shellac impregnation, the chromatic coordinate (a* and b*) values increased. According to the Fourier-transform infrared (FTIR) spectroscopy results, changes were determined in the chemical structures of the wood samples impregnated with NaOH, whereas the shellac did not cause a change in the chemical structure of the wood samples.

Effect of polypropylene fiber length on mechanical and thermal properties of autoclaved aerated concrete

In this experimental study, the effect of polypropylene fiber (PF) length on the thermal conductivity, pressure and flexural strength values ​​of autoclaved aerated concrete (AAC) was investigated. The investigation used samples from G2/04, G3/05, and G4/06 classes AAC manufacturing in three different density and compressive strength groups. PF of three different lengths, 3, 6, and 12 mm, were chosen as reinforcement material, and AAC samples were made by adding 1.0% in the same volumetric ratios into the matrix material, taking into consideration their specific gravity. After the samples were kept in curing at 60 °C for 4 h, they were cured in an autoclave at 180 °C at 11 bar pressure for 7 h. After the autoclave process was completed, the flexural and compressive strength, thermal conductivity values of the samples were tested and the internal structure images were examined with a scanning electron microscope (SEM). It was observed that the flexural and compressive strengths of the samples increased with PF reinforcement in all density groups, while the thermal resistances decreased and the fiber length (for 3, 6 and 12 mm) had a positive effect on the compressive and flexural strengths of all examined AAC classes. It was obtained by 70.4% increase in the compressive and flexural strengths of G2/04 class of AAC samples with 12 mm length PF addition. As the PF length increases, the thermal conductivity values ​​of all samples also increase and the highest thermal conductivity increase was observed in the G5/06 class samples with a value of 20.2%. In general, it was observed that the compressive strength, bending strength and thermal conductivity values ​​of all samples increased depending on the increase in PF length. It has been observed that thermal conductivity values are worsen at more higher rates while the strength values of AAC at all fiber lengths is improves with PF additive.

Enhanced strength and fracture characteristics of the TiAl/Ti2AlNb laminated composite

In this study, TiAl/Ti2AlNb laminated composite has been prepared via vacuum hot-pressing sintering. The composite exhibits a good synergy between bending strength and ductility, with a significantly enhanced bending strength value of 910.25 MPa. The fracture characteristics in the TiAl alloy layer, Ti2AlNb alloy layer and interfacial α2-Ti3Al layer are separately elucidated. It is concluded that the slip bands, tunnel cracks (α2-Ti3Al layer), deflected microcracks (Ti2AlNb alloy layer), and microcracks (TiAl alloy layer) are involved in the fracture process. Moreover, the main deformation behaviors consist of dislocation glide and local microcracking. The formation of stack faults and twins is also observed in the TiAl alloy layer. Furthermore, we focus on revealing the relationship between the deformation behaviors and fracture process of the composite. In particular, the strain partitioning and delayed fracture, multistage synergetic deformation mechanisms, and specific microcrack initiation are discussed. These findings are important for investigating the fundamental mechanisms and serving as a guide for the design of high-performance laminated composites.

Bending Strength Evaluation of Glulam Beams Made from Selected Nigerian Wood Species

Bending strength, was assessed in glued laminated beams made from local wood species bonded with phenol resorcinol formaldehyde, polyurethane and urea-formaldehyde adhesives. The 3- point loading was used as the basis of bending strength assessment along the directions parallel and perpendicular to the glue line. The load orientation parallel to the glue line offered higher bending strength. Furthermore, the characteristic values of bending strength obtained were 35.16 N/mm2, 40.79 N/mm2, 47.34 N/mm2, 60 N/mm2, and 67 N/mm2 for Afara, Akomu, Gmelina, Iroko, and Omocedar wood species. These values are similar to strength values given in EN 1194-1999 for glulam beams. Consequently, the findings of the study are beneficial to architects and structural engineers in exploring the dimensional, strength, and architectural flexibility glulam affords for both beam and column design and holds the potential for creating an industrial hub for enhancing the value chain around engineered wood and allied industries.

Microstructural and mechanical characterization of high strength porcelain insulators for power transmission and distribution applications

Porcelain insulators have prodigious importance in electricity transmission and distribution network because of their high dielectric constant, electrical resistivity, and mechanical strength and these properties are closely connected to the microstructural details of the insulator. Three different porcelain insulators (Sample A, B and C) were reported in the present work. X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), three point bending test and density and pore analysis were carried out to investigate the structural and mechanical properties of various insulators. The analysis confirmed that the porcelain insulators are made of industrial alumina, quartz, clay, and feldspar having amorphous as well as crystalline phase in the body. The porosity, density, and bending strength were also calculated and a correlation was developed between mechanical strength of the insulator and various physio-chemical and microstructural properties. Sample A showed the highest value of bending strength i.e. 207.20 MPa and sample C the lowest value of 112.18 MPa while sample B demonstrated the intermediate value of 170.98 MPa. To formulate high strength porcelain insulators, it was concluded that the amount of amorphous phase, dispersed corundum, and mullite content are key factors to control the mechanical strength of porcelain insulators.

Fabrication of (Zr,Ti)B2–ZrN–BN composites through reactive spark plasma sintering of ZrB2 and TiN

Mechanical properties and sintering behavior of additive-free and TiN-doped ZrB2 ceramics were studied. Reactive spark plasma sintering method was applied for manufacturing of ceramics at 1850 °C for 6 min under 40 MPa. The impact of TiN addition on the microstructure evaluation, densification, and mechanical feathers was investigated. A porous monolithic ZrB2 with a relative density of 76.5 % was manufactured, while the introduction of 5 wt% TiN resulted in enhancement of relative density to 93.1 %. The formation of (Zr,Ti)B2 solid solution and in-situ h-BN and ZrN phases was proven by microstructural assessments and X-ray diffractometry. Minimizing the grain growth and improving the densification, as the results of TiN addition, led to enhancement in mechanical properties. The values of bending strength, fracture toughness, and Vickers hardness boosted from 187.6 MPa, 1.9 MPa.m½, and 10.1 GPa for additive-free ZrB2 to 606.5 MPa, 4.5 MPa.m½, and 18.8 GPa for (Zr,Ti)B2–ZrN–BN composite.

MODERN TECHNOLOGIES FOR THE MANUFACTURE OF GLASS-CERAMIC DENTAL PROSTHESES

The relevance of the problem of improving the quality of life and protecting human health in the context of the successful development of the modern society was presented. A literary review of well-known modern technologies for the design and manufacture of dental prostheses was carried out, as well as the leading domestic and foreign companies that were engaged in this were given. The history of the development of materials for obtaining clinical restorations (crowns, inlays, onlays, etc.) was considered and the main directions of the development of innovative ceramic materials for dental prosthetics were outlined. Based on the analysis of the properties of various types of materials for dental prosthetics, the prospects of using glass-ceramic materials in the development of dental prostheses have been substantiated. The chemical compositions of lithium silicate glasses for the synthesis of the glass matrix have been developed and the technological parameters for the production of glass-ceramic dental prostheses have been selected (Тgl. melting = 1350–1400 °С, Тheat treatment = 600–650 °С). Preliminary heat treatment before the formation of products ensures the formation of the required number of the nucleus of crystalline phase and the prerequisites for creating a volume crystallized structure under conditions of short-term heat treatment. The glass-ceramic prosthesis with a formed interpenetrating sitallized structure was obtained by the method of hot pressing with a short exposure (18-20 min). It was found that the obtained glass-ceramic material containing lithium disilicate as a crystalline phase in an amount of 40-60 vol. %, had high values of bending strength (σ = 400 MPa) and fracture toughness. The indicated mechanical properties of the developed materials, along with the approximate values of their modulus of elasticity to natural teeth, will significantly extend the service life of products under conditions of significant alternating loads that arise during the chewing cycle. A comparative assessment of the competitiveness of the developed dental prostheses based on lithium disilicate with world analogues was carried out, in particular the products of Ivoclar Vivadent and Vita Zahnfabrik, in terms of the main operational parameters. The positive effect of the introduction of domestic developed glass-ceramic dental prostheses to reduce import dependence has been determined.

Selected Properties of Plywood Bonded with Low-Density Polyethylene Film from Different Wood Species.

In this work, the effects of wood species and thickness of low-density polyethylene (LDPE) film on the properties of environmentally-friendly plywood were studied. Rotary-cut veneers from four wood species (beech, birch, hornbeam and poplar) and LDPE film of four thicknesses (50, 80, 100 and 150 µm) as an adhesive were used for making plywood samples. The findings of this study demonstrated that plywood samples using all the investigated wood species bonded with LDPE film showed satisfactory physical–mechanical properties. Poplar veneer provided the lowest values for bending strength, modulus of elasticity and thickness swelling of all the plywood samples, but the bonding strength was at the same level as birch and hornbeam veneer. Beech plywood samples had the best mechanical properties. An increase in LDPE film thickness improved the physical–mechanical properties of plastic-bonded plywood.

Finger-jointing of green Eucalyptus globulus L. wood with one-component polyurethane adhesives

The use of glued finger joint in green wood, directly from the sawing process, would open the possibility to obtain glued timber from small-sized wood, achieving an efficient use of the original raw material. The gluing of finger-jointed green wood, with moisture content above the fibre saturation point, may improve the efficiency and the manufacturing process of glulam or joinery. This may be especially beneficial for a hardwood such as Eucalyptus globulus L., which is a globally important forest resource, but is a challenging wood to dry. This article presents a study on the possibility to develop finger joints with wood in green state. To compare them, conventional finger joints on dry wood and solid boards without end joints were also manufactured. Cold-setting and fast-curing commercial one-component polyurethane adhesive systems were used. Finger-jointed samples were tested to determine mean and characteristic values (5th percentile) of density, bending strength and modulus of elasticity, and the results were analysed and discussed. Green-glued joints showed no statistically significant differences compared to the solid boards and improved strength properties with respect to dry-glued joints.

Utilization of abrasive industry waste as a substitute material for the production of fireclay brick

The present work deals with the production of fireclay brick by adding different compositions of 0%, 10%, 20% and, 30% of alumina abrasive waste. Samples are prepared by uniaxial pressing of 150 MPa and fired at different temperatures such as 900 °C and 1100 °C. The physical properties such as bulk density, apparent porosity, linear shrinkage, and water absorption were estimated for the prepared fireclay brick samples with and without alumina abrasive waste. The results show that fireclay brick samples of BFC30 possess an increase in strength and bulk density. BFC30 formulation exhibited the maximum compressive strength of 31.15 MPa, with lower water absorption of 5.84% and linear shrinkage value of 1.64%. The highest bending strength value of 35.34 MPa was observed in the BFC30 sample. Furthermore, the increase in alumina abrasive waste weight percentage improves the mechanical properties by increasing the alumina and silicon dioxide content in the produced fireclay brick. The lowest volumetric wear rate of 2.4 g/mm3 was observed on the BFC30 sample at the lowest impingent angle of 30°. Replacement with abrasive waste tends to improve the refractory property. The substitution of alumina abrasive waste is beneficial in terms of waste utilization and cost reduction in fireclay brick production.

Elution and Biomechanical Properties of Meropenem-Loaded Bone Cement.

ObjectiveTo investigate the biomechanical and elution properties of meropenem‐loaded bone cement.MethodsBone cement (Palacos LV) with 5% (2 g/4 0g), 10% (4 g/40 g), and 15% (6 g/40 g) meropenem; 5% (2 g/40 g) and 10% (4 g/40 g) vancomycin; and blank bone cement were prepared in a total of six groups named A2, A4, A6, B2, B4, and A0 (antibiotic‐free). 36 cylinder specimens (6‐mm diameter and 12‐mm height) of all six groups were molded for a compression test. After the compression test, because of mechanical properties below the ISO standard requirements, groups B2, B4 were not subjected to a bending test. So a total of 24 rectangular strip specimens (10‐mm width, 75‐mm length, and 3.3‐mm thickness) for groups A2, A4, A6 and A0 were molded for the bending test. Between‐group differences of compressive strength, bending strength and bending modulus were analyzed. The meropenem standard was prepared as a series of standard solutions to calculate the standard curve. At a constant temperature of 37 °C, separately, meropenem‐loaded bone cement cylinder specimens (12 mm in diameter and 17 mm in length) of A2, A4 and A6 were serially immersed in saline solution without stirring. The eluent drug concentration at 24, 48, 72 h and 6, 12, 24 days was measured and the drug concentration‐time curve of meropenem was constructed.ResultsWith the exception of groups B2 and B4, all cements compressive strength values were well above the minimum requirement of the ISO 5833 standard (70 MPa). The compressive strength and bending strength values of group A4 were higher than those of group A0 (P < 0.05), but no difference was found between the A0, A2 and A6 groups (P > 0.05). There were no intergroup differences of bending modulus between the A0, A2, A4 and A6 groups (P > 0.05). A standard curve of meropenem was obtained and a regression equation was constructed: Y = 15.0265 X + 13.5218, r = 1.00. At 37 °C, the release of meropenem was rapid during the first 48 h for all A2, A4, A6 samples, and subsequent release continued to decrease.ConclusionWhen adding up to 15% (6 g/40 g) meropenem to the bone cement, the biomechanical properties were not reduced, and bone cement with 10% (4 g/40 g) meropenem had the best performance. At a constant temperature of 37°C, meropenem can be released from bone cement for up to 24 days.

ASSESSMENT OF THE STABILITY OF CARBON FIBER TO THE ACTION OF TRANSVERSE LOADS TAKING INTO ACCOUNT TIME AND CLIMATE FACTORS

The relevance of research in the development of physical methods for increasing the stability of products made of polymer composite materials (PCM) to the influence of environmental factors, taking into account its duration, is shown. The influence of exposure of carbon fiber samples on an epoxy matrix in the natural conditions of the climate zone of Saratov on the change in the limit stresses of three-point bending was studied. Comparative tests of samples premodified in a microwave electromagnetic field with a frequency of 2.45 GHz with an energy flux density (17…18)×104 µw/cm2 were performed. It is shown that the influence of environmental factors leads to a decrease in the limit stresses by (3,7…10,4) % depending on the exposure. Modification of carbon fiber in the cured state in the microwave electromagnetic field reduces the negative influence of the external environment by reducing the strength by (44.3…73) %. It was found that the strengthening effect of microwave modification increases with increasing exposure from 6 % to 11.5 % under the accepted experimental conditions, while the uniformity of the bending strength values in the batch increases significantly, which is manifested in a decrease in the coefficient of variation of limit stresses by (70.2…77.8) %. Functional dependencies in the form of 2nd-order polynomials are obtained, allowing with confidence (98…99) % predict the stability of products made of modified carbon fiber during long-term operation under the influence of environmental factors.

Analysis of mechanical strength of weight fraction variation sugar palm fiber as polypropylene-elastomer matrix reinforcement of hybrid composite

Currently, the availability of polypropylene, elastomer and sugar palm fiber (Arenga pinnata) is very abundant, which has a good impact on the potential for the development of new composite materials that have good properties and characteristics. Composites are generally a new material composed of two or more different materials with the aim of producing a new material that has better properties than the constituent material. In this study, polypropylene (PP) plastic and elastomer were used as a composite matrix reinforced with sugar palm fiber (Arenga pinnata). The purpose of this study was to determine the value of tensile strength, impact strength, and bending strength of composites with a weight fraction of 20 % (80:20), 30 % (70:30), and 40 % (60:40). Based on the results of the research on hybrid composites of polypropylene and fiber-reinforced elastomers, composites with a weight fraction of 20 % (80:20) got the lowest tensile strength value of 1.153 MPa, while composites with a weight fraction of 40 % (60:40) obtained the highest tensile strength value of 2.613 MPa. Composites with a weight fraction of 20 % (80:20) got the lowest tensile strain value of 0.0049 and the highest tensile strain value of 0.0067 was found in composites with a weight fraction of 40 % (60:40). For the impact strength, the 40 % (40:60) weight fraction composite got the lowest value of 45248.234 kJ/mm2, while the 20 % (80:20) weight fraction composite got the highest impact strength of 17649.97 kJ/mm2. For bending strength results, the composite with a weight fraction of 20 % (80:20) obtained the lowest bending strength of 1.7778 MPa, while the composite with a weight fraction of 30 % (70:30) obtained the highest bending strength of 4.8867 MPa. The highest bending strain was found in the composite with a weight fraction of 20 % (80:20), which was 0.0207.

A Study on Feasibity of Secondary Recycled Fibers for Binderless Board Manufacturing

The fiber length distributions and relative ratios (%) on furnish of recovered newspaper pulps are determined. However, the weight percentage of long fiber- and short fiber fractions (fines) was calculated approximately 46.9% and 43.3% in secondary pulp mixture, respectively. These could be well sign of heterogenous fiber types and distribution of fiber length in various mesh fractions in pulp furnish. The highest internal bond (IB) value of 0.29 N/mm 2 was found for those in medium density (582 kg/m 3 ) board sample followed by 0.16 N/mm 2 (I) and 0.15 N/mm 2 (D) samples. Moreover, regardless of experimental conditions only J type panel, which is the highest density (768 kg/m 3 ) among study, give a bending strength value of 3.05 N/mm 2 . It has already well established that strength feature is usually correlate relative bonding area, the surface activation and fiber flexibility, which originates from the fiber properties. However, recycling stages could be made shortened fibers and creating fines. These impact on lowering strength with creating poor surface accessibility for bonding. It has realized a poor compatibility between secondary waste newspaper fibers in boards matrix structure. This is due to non-fibrous heterogeneous elements in furnish and these interfere fiber-fiber bonding to develop appropriate strength in board structure. A cleaning procedure of these nonfibrous additives could be improved strength developments of panels. It is also realized that without any synthetic and/or natural adhesive usage, it is very difficult to get a well strength on these panel products which made from recovered newspaper fibers.

A case study of re-design for 3D printing: proposal to replace metallic fastening elements in an orthopedic corset with 3D printed PLA850 substitutes

Medicine is implementing revolutionary techniques like 3D printing in customized patient care. This enables tailor-made manufacturing with high productivity and low cost. In this work, the possibility of replacing the metal closures of an orthopedic corset using 3D printing has been studied. For the redesign, a multi-criteria decision analysis method is carried out. A design of experiments of nine specimens on the final prototype has been realized to determinate the most optimal printing parameters. The printing parameters analysed have been: infill density, infill pattern and printing speed. These specimens were subjected to a non-standardized bending test. From the experimental results, a triangular infill pattern, 100% infill density and 100 mm/s in printing speed provide the best bending strength values.

Structural Application of Lightweight Panels Made of Waste Cardboard and Beech Veneer.

In recent years, the furniture design trends include ensuring ergonomic standards, development of new environmentally friendly materials, optimised use of natural resources, and sustainably increased conversion of waste into value-added products. The circular economy principles require the reuse, recycling or upcycling of materials. The potential of reusing waste corrugated cardboard to produce new lightweight boards suitable for furniture and interior applications was investigated in this work. Two types of multi-layered panels were manufactured in the laboratory from corrugated cardboard and beech veneer, bonded with urea-formaldehyde (UF) resin. Seven types of end corner joints of the created lightweight furniture panels and three conventional honeycomb panels were tested. Bending moments and stiffness coefficients in the compression test were evaluated. The bending strength values of the joints made of waste cardboard and beech veneer exhibited the required strength for application in furniture constructions or as interior elements. The joints made of multi-layer panels with a thickness of 51 mm, joined by dowels, demonstrated the highest bending strength and stiffness values (33.22 N∙m). The joints made of 21 mm thick multi-layer panels and connected with Confirmat had satisfactory bending strength values (10.53 N∙m) and Minifix had the lowest strength values (6.15 N∙m). The highest stiffness values (327 N∙m/rad) were determined for the 50 mm thick cardboard honeycomb panels connected by plastic corner connector and special screw Varianta, and the lowest values for the joints made of 21 mm thick multi-layer panels connected by Confirmat (40 N∙m/rad) and Minifix (43 N∙m/rad), respectively. The application of waste corrugated cardboard as a structural material for furniture and interiors can be improved by further investigations.