Bu çalışma, güney sarıçam (Pinus taeda L.) odununun mod I yüklemesi altında radyal-boyuna çatlak ilerleme yönünde kırılma davranışına yoğunluğun etkisini araştırmayı amaçlamıştır. Her bir kırılma testi bloğu için çatlak ucu konumunun yoğunluğu, X-ışını yoğunluk profili analizörü kullanılarak belirlenmiştir. Her bir kırılma test bloğunun yük-deformasyon eğrisinden başlangıç eğimi, kırılma tokluğu ve özgül kırılma enerjisi olmak üzere üç kırılma parametresi elde edilmiştir. Genel olarak, sonuçlar kırılma parametrelerinin yoğunluktan güçlü bir şekilde etkilendiğini göstermiştir. Yüksek yoğunluğa sahip çatlak ucu konumları, çatlak başlangıcına karşı daha dirençli görülmüştür. Yük-deformasyon eğrisinin ilk eğimi, ahşaptaki çatlak yoğunluğu arttıkça artmıştır. Regresyon analizi sonucunda yoğunluk ile her bir kırılma parametresi arasında pozitif ve güçlü korelasyonların olduğu gözlemlenmiştir.
The effect of crack length on the fracture behavior of particleboard was investigated using the single-edge-notched bending (SENB) test method under mode I loading. The initial slope (kinit), critical stress intensity factor (KIC), specific fracture energy (Gf), and brittleness number were calculated for five different crack length/specimen width (a/W) ratios varying from 0.1 to 0.9 at intervals of 0.2. The results show that the fracture properties were significantly higher for specimens with an a/W ratio of 0.1 than for the others. However, for the critical stress intensity factor and specific fracture energy, there were no significant differences among the a/W ratios of 0.3, 0.5, and 0.7 where the crack tip was placed in the core layer of the particleboard. In general, as the a/W ratio decreased, the stiffness of the material increased, and the specimens with an a/W ratio of 0.1 showed brittle behavior. However, there was no statistically significant difference between a/W ratios of 0.5 and 0.7.
In the competitive market, many furniture manufacturers are improving their process efficiency, eliminating unnecessary costs, and improving quality by using wood-based composite panels in frames. Currently, upholstery furniture frames are made by using over 70% wood-based composite panels, which causes material utilization to be the most important area of improvement. Many furniture manufacturers have realized that increased design and production efficiencies using wood-based panel products as their frame stocks combined with computer numerical control (CNC) technology is beneficial for the manufacturing process. However, manufacturers are continuously looking for alternatives to improve the bottom line of the manufacturing process, which includes optimization of the assumed panel width to maximize the cutting yield. In this case study, the effects of increasing the width of full-size wood-based composite panel products (1219-mm-wide × 2438-mm-long) on the cutting yield of parts for two upholstered frame models were investigated using computer simulation software with an optimization capacity. The results of the simulation indicated that increasing the width of the full-size wood-based composite panel products to 1371 mm and 1524 mm could yield better material cutting yields compared with the 1219-mm-wide panel products.
The aim of this study was to determine the fracture behavior of southern yellow pine (Pinus taeda L.) and red oak (Quercus falcata) wood under mode I loading in the tangential-radial and tangential-longitudinal crack propagation systems by a compact tension test method. The results of the study indicated that, in general, red oak had a significantly different fracture behavior than southern yellow pine for each of the two crack propagation systems. The fracture toughness was higher in the tangential-radial crack propagation system than that in the tangential-longitudinal crack system, but there was no significant difference between the two crack propagation systems for southern yellow pine. The specific fracture energy of the tangential-longitudinal crack propagation system for both wood species was significantly lower than that of the tangential-radial crack propagation system. It means that more energy per unit area for the tangential-radial crack propagation system was needed to separate a wood sample into two halves. The difference in the fracture behavior of wood by the crack propagation system can be explained by the structural features of the tested samples since the crack propagation of the tangentialradial system crosses the annual ring and wood fibers can bridge the crack surface.
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