KARAKTERISTIK SIFAT FISIKA DAN MEKANIKA KAYU LAMINA KOMBINASI JENIS KAYU SENGON (Paraserianthes falcataria (L.) Nilsen) DAN JENIS KAYU MERBAU (Intsia spp.)

This study aims to determine the physical and mechanical characteristics of wood lamina combination of sengon wood and merbau with Melamine Urea Formaldehyde (MUF) adhesive. The testing method used is based on the DIN standard. The test results of the average lamina density of 0.58-0.73 g / cm3 at oven drying moisture content. Modulus of Elasticity (MoE), Modulus of Rupture (MoR) and value of compression parallel to grain highest found in the combination of merbau-sengon-merbau-sengon-merbau and the lowest in the combination of sengon-merbau-sengon. While the adhesive shear strength is the highest value in the combination treatment of merbau-merbau and the lowest in the combination of sengon-sengon. Based on the modulus of elasticity (MoE) of sengon treatment as face / back and merbau as core (3 and 5 layers) can be classified into strong class IV-V, merbau as face / back and sengon as core (3 and 5 layers) can be classified into strong class II-III. Modulus of Rupture (MoR) can be classified into strong class II-III and compression parallel to grain into strong class II.

KARAKTERISTIK SIFAT FISIKA DAN MEKANIKA KAYU LAMINA KOMBINASI JENIS KAYU SENGON (Paraserianthes falcataria (L.) Nilsen) DAN JENIS KAYU MERBAU (Intsia spp.)

This study aims to determine the physical and mechanical characteristics of wood lamina combination of sengon wood and merbau with Melamine Urea Formaldehyde (MUF) adhesive. The testing method used is based on the DIN standard. The test results of the average lamina density of 0.58-0.73 g / cm3 at oven drying moisture content. Modulus of Elasticity (MoE), Modulus of Rupture (MoR) and value of compression parallel to grain highest found in the combination of merbau-sengon-merbau-sengon-merbau and the lowest in the combination of sengon-merbau-sengon. While the adhesive shear strength is the highest value in the combination treatment of merbau-merbau and the lowest in the combination of sengon-sengon. Based on the modulus of elasticity (MoE) of sengon treatment as face / back and merbau as core (3 and 5 layers) can be classified into strong class IV-V, merbau as face / back and sengon as core (3 and 5 layers) can be classified into strong class II-III. Modulus of Rupture (MoR) can be classified into strong class II-III and compression parallel to grain into strong class II.

Preparation and Properties of Anaerobic Adhesive Containing 2,3-Glycidyloxypropyl-POSS-Acrylate/Epoxy Acrylate

In order to prepare an anaerobic adhesive which has a good heat resistance, the epoxy acrylate of polyhedral oligomeric silsesquioxanes (POSSEA) -containing was synthesized and was used as a as main composition of adhesive monomers. The anaerobic adhesive was prepared from POSSEA, 2-hydroxyethylacrylate, acrylate, and selecting a suitable redox initiating system. The correlated properties were determined by DSC, TGA, so on. The results show that the appeared reaction order of curing reaction was 0.87 and activation energy Ea was 59.9 kJ/mol. The initial degradation temperature of this adhesive is 302 °C, and followed first order kinetics. The adhesive shear strength of steel plate is 24.6MPa. The results indicated that this anaerobic adhesive has well bonding strength and high temperature resistance property.

Experimental Study of Effect of Adhesives on Strength of Composites Adhesive Joints

Tension tests on T700/EXOPY unidirectional laminates and 3-D and six-directional braided composites single-lap adhesive joints with different adhesive types under uniaxial tensile loading are performed in the presented paper. Failure modes, strengths and load-displacement curves of two kinds of different adhesive joints are compared and analyzed. According to the experimental results, it is found that the strength of the joints of the smaller adhesive shear strength is less, in contrast, the strength of the joints of the bigger adhesive shear strength is greater, Failure shear strength average is grown 27% relatively. And the starting position of the crack is appeared at the overlap ends, and the whole joint is failed with propagation of the crack.