Shear moduli of Calabria pine (Pinus brutia Ten.) predicted using non-destructive test method in this study. Calabria pine logs harvested from Beşkonak, Burdur and sawn in to Radial and Tangential planks. 26 surface polyhedral NDT samples prepared in 65x65x65mm dimensions. All samples acclimatized at 20±1°C temperature and 65% RH conditions. Ultrasonic shear wave velocities of Calabria pine wood calculated using time of flight values. Time of flight values obtained using Olympus EPOCH 650 flaw detector and Panametrics NDT V153 shear wave transducers. Shear moduli predicted using calculated velocities. Average density and moisture content of the non-destructive test samples determined as 0.558g/cm 3 and 12.66%, respectively. Shear wave velocities and shear moduli of LR, LT, and RT planes were determined as 1408, 1306 and 666m/s and 1108, 952 and 248N/mm 2 , respectively.
The goal of this study was to analyze the situation of the cooperation between University and Industry in Düzce, Turkey. Target population of the study was the firms that related only woodworking industry. There were 242 firms according to the registry of Düzce Chamber of Industry and Commerce. But some of them were only the end product seller instead of manufacturer or supplier. Because of this reason, population of this study was determined as 154 firms. And this was the only constraint of the study. 91 of 154 firms were surveyed by the face to face method with 41-question survey. According to the results it can be said that Industry knows very little about opportunities and has little concern with cooperation. Also, miscommunication may be the one of the main reason of weak cooperation. In this regard, Technology Faculties are able to strengthen this weak cooperation due to its on-site education syllabus.
It was aimed in this study to determine the effect of the number of joints in frames produced from Oriented Strand Board (OSB) and of the type of adhesive on the diagonal tensile strength (DTS) of the frame. With this objective, a total of 152 specimens were prepared from OSB in accordance with the principles in the EN 2470 test standard. The diagonal tensile test was applied to the specimens in the universal test equipment in accordance with ASTM-D 1037. According to the statistical analysis of the data obtained from the tests, the number of dovetail joints and the type of adhesive had significant effects on the DTS. The highest DTS (0.117 N/mm2) was obtained in the specimens with a single dovetail joint and bonded with the PVAc adhesive. This alternative was followed by the specimens with a double dovetail joint bonded with the PVAc adhesive (0.078 N/mm2) and the specimens with a single dovetail joint bonded with the PU adhesive (0.073 N/mm2). The lowest DTS occurred in the specimens with single and double joints without adhesive. According to these results, adhesive should definitely be used in the corner joining of the dovetail joints, and the single dovetail joint joining type bonded with PVAc adhesive is preferred.
In this study, the moisture-dependent shear moduli of Calabrian pine were determined by a 45° off-axis compression test, and ultrasonic measurement were performed to determine the effectiveness of the nondestructive method for shear modulus prediction. Also, finite element modeling and analysis was performed to compare the results with static stress-strain curves within the linear elastic region. Ultrasonic transverse wave velocities in longitudinal-radial (LR), longitudinal-tangential (LT), and radial-tangential (RT) planes decreased from 1447 to 1368, 1342 to 1264, and 682 to 642 m/s with an increase in relative humidity (RH) from 45% to 85%, respectively. Static and dynamic shear modulus in LR, LT, and RT planes decreased from 1054 to 933, 905 to 825, and 230 to 210 N/mm2, and 1141 to 1065, 982 to 909, and 254 to 235 N/mm2 when relative humidity increased from 45% to 85%, respectively. The influence of the moisture content on the transverse velocity and moduli was statistically significant. The coefficient of determination between the dynamic and static shear moduli ranged from 0.77 to 0.96.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.