Owing to high specific strength and stiffness, composites find wide applications in automobile and aerospace industry. In this paper, an attempt has been made to study the vibration characteristics of embedded shape memory alloy wire (SMA). Earlier, experimental modal analysis was carried out on the carbon fiber reinforced epoxy composite beams (CFRP beam) embedded with shape memory alloy wire manufactured by hand lay-up process. Increased levels of pre-strain up to 4% on shape memory alloy wire resulted in maximum increment in natural frequency when activated at 75°C. The experiment also investigates change in modal frequencies in CRPF plates embedded with the SMA wires. The selected pre-strain for experimentation was 4% pre-strain actuated at 75°C.
Wire electrical discharge machining (WEDM) can machine hard materials with ease. Nimonic 80A is hard and high temperature resistant material which is widely used in the power plant boiler tubes, gas turbines, exhaust valves. This work involves in developing a models for correlating the dependency of various WEDM process parameters of Nimonic 80A like gap voltage, duty factor and feed rate on response factors like rate of material removal (MRR), wire wear ratio and surface roughness (SR). This experiment was carried out on the basis of Response Surface Methodology (RSM) and Grey Relational Analysis (GRA). Using the design of experiments, 20 experiments were conducted. The duty factor of 0.8771, gap voltage 17V and wire feed rate of 17m/min was found to be the optimized process parameter while machining Nimonic 80A.
The vital issue when joining magnesium combination (Mg) and aluminum composite (Al) exists in the presence of development of oxide movies and fragile intermetallic inside the bond district. Be that as it may, dispersion welding is acclimated be a piece of these amalgams while not a great deal of issue. In this examination, an endeavor was made to break down the mechanical properties, for example, lap shear quality, Ram rigidity and microhardness for dispersion holding of AZ80 magnesium (Mg) and AA7075 aluminum (Al) disparate materials. The holding nature of the joints was checked by microstructure examination. This work is directed to get better understanding and portrayal of the dissemination holding of comparative and different metals. It additionally meant to acquire ideal parameters for dispersion holding of aluminum covering over magnesium composite with Aluminum amalgam. This work is led to get better understanding and portrayal of the dispersion holding of comparable and different metals. It additionally intended to get ideal parameters for dispersion holding of aluminum covering over magnesium composite with aluminum amalgam. These two metals are jointed inside the kick the bucket in the wake of completing surface treatment.
Carbon-dioxide laser beam machining (LBM) is used for machining intricate shapes and hard materials which are inconceivable with conventional machining methods. Inconel 718 finds its prime applications in manufacturing high pressure turbine components and structural components of aerospace industry. Inconel 718 alloy exhibits superior physical and mechanical properties at elevated temperature, Strength-to-density ratio and higher corrosion resistance. The objective of the current work is to determine the optimal setting of the process parameters like laser power, cutting speed, gas pressure while machining Inconel-718 material using oxygen gas. The experiment was conducted using Taguchi L9 orthogonal array. A square washer with four holes of diameter 8 mm and one hole of diameter 64 mm was machined using laser beam machining and the best combination of process parameters to acquire better response parameters is computed. The optimized value of surface roughness was found to be 3.5µm and similarly material removal rate to be 45.56 m3/min when operated at 2.1m/min cutting speed, cut of type rough, 1mm of focal point and 4000bar gas pressure, The effect of input variables on various response parameters namely surface roughness (Ra), Heat affected zone thickness (HAZ), material removal rate (MRR), Taper, Circularity, hardness were studied. Morphology of the machined surface was investigated using SEM analysis.
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