The Experimental and Finite Element Analysis of Diagonal Tensile Tests Conducted on Frame-Type Constructed Corner … (original) (raw)
Tensile Performance of Traditional and Modern Corner Joints in Wooden Structures
Drvna industrija, 2022
Corner joints are critical points of wooden structures not only in furniture construction but also in traditional wooden architecture, especially in constructions without nails. This study was performed to determine the effects of particular factors such as the axis of assembly, types of material, and adhesive on the tensile performance of various modern and traditional types of wooden corner joints. For this purpose, various corner joint specimens were prepared with three different wooden materials: Scots pine (Pinus sylvestris Lipsky) wood, Lombardy poplar (Populus nigra Lipsky) wood, and Medium Density Fibreboard (MDF) using two different adhesives: polyvinyl acetate (PVAc) and polyurethane (Desmodur-VTKA) glues; and five different wooden joint types: dowel, tongue-and-groove, half-blind dovetail, screw, and eccentric screw joints. Tensile performance tests, vertical and parallel to the axis of assembly, were carried out according to ASTM D 1037 guidelines. Experiments indicated ...
Enhancement of load-carrying capacity of corner joints in case-type furniture
Materials & Design, 2012
In this study, the failure loads of L-type corner joints in case-type furniture have been analyzed experimentally and statistically in laminated medium-density fiberboard material. The failure loads of five corner joints have been analyzed experimentally under tension and compression moments; these joint types are glass-fiber composite layer (C), dowel (D), dowel + composite layer (DC), dowel + minifix (DM), and dowel + minifix + composite layer (DMC). The test results were analyzed statistically by Weibull distribution to obtain a 95% reliability level for failure load. Tests were carried out according to ASTM Standards. Results show that the failure load takes its highest value in the DMC case for both average values of the test results and for 95% reliability under Weibull distribution. On the other hand, it takes its lowest value in the D case. In addition, the 95% reliability value for each corner joint configuration is approximately equivalent to the 0.53 average value of the failure load.
Materials & Design, 2010
Edge banding is used to cover the exposed sides of wood materials such as plywood, particleboard or medium-density fiberboard, giving the appearance of a solid (or more valuable) material. This study was carried out to determine the effects of the edge banding material, namely polyvinyl chloride (PVC), melamine and wood veneer, thickness of edge banding material (0.4, 1, and 2 mm), and wood composite panel type on the diagonal compression and tension strength properties of particleboard surfaced with synthetic resin sheet (LamPb) and MDF surfaced with synthetic resin sheet (LamMDF).
Load-carrying capacity of mitered furniture corner joints with
2014
Th e goal of this study was to introduce a method for estimating stress analysis as an effi cient procedure for evaluating the strength of mitered corner joints in furniture structures. Tests were carried out to determine the eff ects of panel type, distance between the centers of dovetail holes and the edges of joints (10, 20, and 30 mm), and type of dovetail key on the load-carrying capacity of mitered corner joints under a diagonal tension load. Specimens were constructed of overlaid medium-density fi berboard (LamMDF) and particleboard (LamPb) and connected with butterfl y and H-shaped dovetail keys. Polyvinyl acetate adhesive was used to assemble the joints. Specimens were tested under diagonal tension loads and the corresponding combined stress analysis was conducted using the following formulas: Total stress at the outer edge, Total stress at the inner edge, where σb is bending stress, σa is axial stress, P is axial failure load, L is half of the span length, and t and b are the thickness and width of the joint members. Test results showed that corner joints constructed of LamMDF were 13% stronger than joints constructed of LamPb. For the specimens constructed of both panel types, a 10-mm distance between the dovetail holes and the edges of joints gave better results than distances of 20 and 30 mm. No signifi cant diff erences were observed between the 2 types of dovetail keys. Total compression stresses at the outer edge were 2 times greater than the total tension stresses at the inner edge of the joints.
Pro Ligno, 2015
The objective of this study was to investigate the effects of panel types and fastener types on moment capacity of L-type corner joints. For this purpose, fasteners and material types on the failure loads of L-type corner joints have been analyzed experimentally and statistically. Screw, minifix, and confirmat screw have been used as fastener types, 18mm plywood (PW), 15mm PW, 16mm partical board (PB), 18mm PB, 16mm medium density fiberboard (MDF) and 18mm MDF have been used as panel types in this study. Physical and mechanical properties of PB, PW and MDF were performed in accordance with the procedures described in ASTM D 4442 (2003) and ASTM D 1037ASTM D (2001) ) standards respectively. According to the results, it is concluded that PW and confirmat screw combination increase the moment capacity of the construction. Thus, both PW and confirmat screw can be recommended to use in furniture construction which need more moment capacity.
Quality of Corner Joints of Beech Chairs under Load
Drvna Industrija
This paper presents quality criteria for corner joints of beech chairs by comparison of break moments during static and dynamic testing of the most frequently used type of construction joints: - round mortise and tenon. Laboratory joint testing using discursive construction methods showed a statistically supported value of the achieved results. The purpose of this paper is to investigate the possibility of shortening the testing procedure of fi nal products and evaluate the quality of fi nal products by segment testing of components in the design phase. The results showed that there is a signifi cant dependence between the Md/Ms coeffi cient and the number of testing cycles. This opens the possibility of a new, different approach to testing the strength of constructions, using methods for testing assemblies instead of entire fi nal products in accordance with the applicable standard working methods.
Estimation equations for moment resistances of L-type screw corner joints in case goods furniture
The effects of the number of screws and screw sizes on bending moment resistance of L-type furniture corner joints constructed of particleboard (PB) and medium density fiberboard (MDF) with resin surfacing were investigated in this study. Six different sizes of screws which included two diameters (4 and 5 mm) and three lengths (40, 50, and 60 mm) were utilized for constructing the test specimens. Specimens were fastened with only screws. Two, three, and four screws were used in the joints of the specimens that have the same width. Specimens were tested under static compression loads that tended to close the joints and tension loads that tended to open the joints. Results indicated that the ultimate moment resistance was obtained with the MDF specimens when the number of screws was four in the joints. MDF corner joints yielded higher moment resistance than PB corner joints for both compression and tension tests. Test results also showed that a screwed corner joint became stronger as either screw diameter or screw length or number of screws was increased. Screw length was found to have a larger influence on bending moment resistance than screw diameter. Furthermore, the average bending moment resistances of screwed corner joints evaluated in this study in compression and tension could be estimated by means of the developed equations.
Bending moment resistances of L-shaped furniture frame joints under tension and compression loadings
Wood Research, 2020
Effect of wood species, joint techniques, and adhesive type on bending moment resistances were investigated. 480 L-shaped joint specimens were tested including 2 loadings, 4 wood species, 3 joint techniques, 2 adhesives, and 10 replications. Specimens were prepared from Scotch pine, Oriental beech, oak, and chestnut. The joint techniques were dowel, half lap and open mortise and tenon, and type of adhesives were polyvinyl acetate (PVAc) and polyurethane (PU). Bending moment resistance of the joints under compression ranged from a low of 60 Nm for Scotch pine dowel joints with PVAc to oak half lap joints a high of 281 N. m w/PVAc. Bending moment resistance of the joints loaded in tension ranged from a low of 230 N. m for scotch pine dowel joints w/PVAc and to a maximum of 917 N. m for oak half lap joints w/PVAc. Highest average moment resistance was achieved with oak half lap jointed specimens w/PVAc, under both loadings.
2014
In this paper, the effects of number and distance between the dowels of ready-to-assemble (RTA) on bending moment resistance of corner joints in cabinet type furniture made of different boards types were investigated. Melamine-coated particleboards (MCP) and melamine-coated fiberboards (MCF) with five different lengths were utilized as test materials. Four different distances between the first drilling hole center and the front edge, referred to as stop, were applied for each test specimen. Small cam fasteners and wooden dowels, together with boards, were used for specimen construction. It was found that the bending moment resistance of MCP and MCF increased when the wooden dowel number increased. It was also determined that the moment resistance increased for both MCP and MCF when the dowel spacing increased up to 160 mm. However, the moment resistance decreased with the increasing dowel spacing from 160 to 192. Additionally, the results showed that the bending moment resistance of...