جستجوی مقالات مرتبط با کلیدواژه "stress carrying capacity" در نشریات گروه "جنگلداری"

Joints are important components of any structure that can be a warranty for the strength of structures. There are different methods for reinforcement of furniture joints that are used according to position and shape of joint. One of the reinforcement methods of corner joints is using wooden corner blocks. Therefore, in this study, the effect of species types and physical situation of wooden corner block on stress carrying capacity of L-shape joint under diagonal tension was investigated numerically and experimentally. For this purpose, L-shape mortise and tenon joints of beech were constructed.. The corner blocks of beech and poplar species were applied to reinforce the joints. The physical situation for beech in three levels (without groove and with grooves 5, and 10 mm) were selected as variables. Also, a control sample (without corner block) was used for comparing. Experimental results have shown that using corner block had a significant effect on stress carrying capacity. There was no significant difference between the species. The maximum stress carrying capacity was obtained of joints that were reinforced with poplar corner block with 10 mm groove depth (30.3 MPa) and the minimum stress carrying capacity was obtained of control sample (6.06 Mpa). Results of numerical analysis have shown that maximum stress of reinforced joints with corner block are in the groove zone of joint members and corner block glue line which this stress concentration caused the failure of members in these zones.

This study was aimed to investigate the bending moment and stress (inner and outer corners) in Lshaped biscuit joint made of solid wood, particleboard and medium density fiberboard (MDF). For this purpose, L-shaped joints made of Beech and Fir, particleboard and MDF by biscuit size numbers of 0 (47×15×3.8 mm), 10 (53×19×3.8mm) and 20 (60×23×3.8mm). Bending moment and stress carrying capacity of the joints were compared to each other. Results showed that bending moment and stress carrying capacity in inner and outer corners of joints were increased by increasing the biscuit size from 0 to 20 (increasing length and wide of biscuit). The Lowest value of these resistance observed in 0 size biscuit. The Results also showed that joints made with Beech were superior to Fir regarding to the measured properties in MDF and particleboards.

This study was conducted to evaluate stress carrying capacity of miter corner joints fabricated with dovetail fitting in frames made with particleboard and medium density fiber board (MDF) under diagonal tension loading. In this study، tests were carried out to determine the effects of dovetail fitting height (9 and 14 mm)، and adhesive types (polyvinyl acetate (PVAs)، cyanoacrylate (CA) on stress carrying capacity of dovetail joints under diagonal tension loading، and the joints without adhesive were compared. The results indicate that stress carrying capacity has increased، with the increase of high dovetail. The stress carrying capacity of joints constructed with CA adhesive was higher than that of those constructed with PVAs and without adhesive. Furthermore، the stress carrying capacity joints constructed with MDF was higher than that of those of particleboard. The lowest ultimate stress carrying capacities (2. 61Mpa) were obtained at 9 mm high dovetail of dovetail joints made of particleboard and without adhesive. Highest bending moment resistance (8. 61Mpa) was observed at 14 mm high dovetail with CA adhesive in medium density fiberboard.