Abstract: 3D Printed ABS polymer samples were investigated for understanding the effect of layer thickness on the various mechanical properties of the component. Standard samples with varying layer thickness were prepared by 3D printing machine which works on the principle of Fused Deposition modeling (FDM) method and compared with sample prepared by standard injection molding method. Results show that tensile strength (36 MPa), impact strength (103.6 J/m) and hardness (R107) were highest for the samples made by injection molding method. Furthermore, among 3D printed samples, properties were better with smaller layer thickness. With increase in layer thickness, there was negative effect on mechanical properties as tensile strength, impact strength and hardness decreased. Exception with hardness of 3D printed ABS samples was found; for largest layer thickness hardness further increased instead of decreasing.
Abstract: A simple and low-cost patterning method is proposed for arbitrary undulatory motion of IPMC actuator. A commercial milling machine is used to provide desired pattern width and depth on surfaces of IPMC actuator. The copper tape is then used to connect electricity to electrode of patterned surfaces. The 2-segment patterned IPMC actuators are fabricated by combining electroless plating and milling machining which can provide precise patterning and control thickness of Platinum electrode layer. It is experimentally confirmed that the proposed patterned IPMC actuator produces undulatory motion as expected. The suggested method can easily be implemented into the IPMC actuator for various applications.
Abstract: In this study, a composite drive shaft for heavy commercial vehicles is designed and manufactured. The carbon/epoxy composite material is used for the shaft tube and the end joints are made of steel. The material properties of the carbon/epoxy composite are obtained by performing coupon tests. The shaft tube is modeled using ANSYS finite element software. The static, buckling and modal analysis are achieved to obtain the Tsai-Wu strength ratio, the critical buckling torque and free vibration frequencies, respectively. The shaft tube is manufactured by using filament winding method. The steel end connections are bonded to the shaft tube during the filament winding process.
Abstract: The article presents the wood composite materials based on biodegradable component of polyvinyl acetate with the filler in a form of wood flour of pine trees of two types: unmodified and thermally modified pine. The sorption properties of composite of both species, namely the ability of a material to absorb moisture depending on the quantity and nature of wood filler were studied. The strength characteristics of composite materials with non-modified and modified wood fillers were investigated and revealed. The research of the loss of relative weight of both types of composite materials while standing in soil was conducted.The expediency of preliminary heat treatment of wood filler on politely if necessary some increase in biostability of the composite is found.
Abstract: The methods and results of experimental investigation on the additive influence of amorphous silica micro powder when mixed in the glue for one-ply particle board are presented in the article. Wooden particles of coniferous and hardwood species as well as glue solution based on carbamide-formaldehyde resin were used for boards manufacturing. The amorphous silica micro powder contained particles 8 μm by the size and specific surface 120...400 m2/g was used in the experiment. The samples were tested to determine their physical-mechanical properties. It was found that 1 % amorphous silica micro powder additive increases the breaking point of one-ply particle board under bending strength by 43%.
Abstract: Attempts were made to produce emulsions suitable for leather fatliquoring by using technical fatliquoring materials and essential oils. An investigation has shown that essential oils of Eucalyptus globulus or Lavandulae officinalis can be mixed with technical fatliquor materials resulting in stable fatliquoring emulsions, which can be disintegrated by adding electrolytes. The stability of emulsions depends on the sort of essential oil and technical fatliquoring product. The use of essential oil for leather fatliquoring did not disimprove properties of the finished leather.
Abstract: The objectives of this study were to mix TiO2 and SiO2 gel for photo catalyzing in methylene blue and calculated energy gap of TiO2- SiO2 gel composite. Nanoparticles of TiO2-doped SiO2 gels have been synthesized for use as composites in photodegradation of methylene blue. SiO2 gel was synthesized by a sol-gel method from rice husk ash. TiO2 was synthesized by microwave method from TiOSO4. The composite of TiO2-SiO2 was prepared by mixing of 25% wt TiO2 and 75% wt SiO2 gel and SiO2 gel bead. This work can be dived into two kinds of TiO2 sources were TiO2 from microwave synthesis (MW) and TiO2 from P25. The UV absorption values of methylene blue after used TiO2-SiO2 composite were measured. Wavelengths of composites were measured by Uv-vis reflectometer and energy gap were calculated.
Abstract: The objectives of this work were to investigate the degradation of methylene blue (MB) by titanium dioxide (TiO2) photocatalyst in dark or no lighting area (NL), the common fluorescent lighting area (FL), and direct sun lighting area (SL). The experimental sections were carried on sol gel method of TiO2 synthesis, the 100 mg of photocatalytic sample was put in 2.0 ppm methylene blue (MB) dye solution, hold in the dark area for 30 minutes to equilibrium state, after that the sample solution can be divided into three area holder that are NL, FL and SL. The degradation rates were studied with UV-Vis spectrophotometric method. The solution hold in the NL area has lower percent degradation than the other, while the solution hold in FL area has higher percent degradation than the other.
Abstract: Cold-formed steel (CFS) is steel based material that has been used broadly in construction and building as non-structural or structural element. Many researchers are studying the CFS as structural element, such as column, beam and roof truss. With a lot of advantages, CFS becoming more popular when distinguished by other material. CFS also owned the unstable and unsafe circumstances when the section in a slender or long column. The main issue that influenced the unstable circumstances for slender column is recognised as local, distortional and global buckling. As a result, the study of the mechanical performance of slender column must be investigated to get some important information for design and analysis intention. Three samples of CFS channel column with a height of 1000, 1500 and 2000 mm are determined. From the testing, the ultimate load of the slender CFS column decreases with increasing of the height of the column. All columns are illustrated having the global buckling when subjected to load. The flange and web deformation of the column is becoming not stiff when the height of the column is increased.
Abstract: Continuous reduction of construction mineral resources, such as sand and cement, which influence the increase in cost of raw materials, has stimulated initiatives to look for alternative sustainable materials. This research aims to determine the potential and feasibility use of recycled fine aggregate (RFA) generated from demolition waste rubble wall as aggregate to replace natural sand in the production of cement and sand bricks. The brick specimens are prepared by using 100% natural sand, which is then replaced by RFA at 25%, 50%, 75%, and 100% by weight of natural sand. Research parameters, such as dimension, compressive and flexural strength, density, and water absorption, are adopted to evaluate the physical and mechanical properties of the brick specimens. In addition, the thermal conductivity of the bricks composed using different RFA proportions are studied. Experimental results clearly indicate that manufacturing cement and sand brick by incorporating RFA is possible, and the effect inclusion of RFA at certain proportions causes a significant improvement in the mechanical properties of bricks. However, to obtain better mechanical strength results, RFA dosages to replace sand should reach up to 50%.