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This study has aimed to investigate the behaviors including evaporation rates, refractive index, volume fractions and mixing characteristics of the binary mixture single droplets containing pentadecane (C-15) and dodecane (C-12) in a heated chamber at a high ambient temperature of 98°C. The volume ratios of pentadecane to dodecane were 3:1, 1:1 and 1:3. The droplet diameter was measured at the forward...
The most commonly used electrical machine is induction machine since it is durable, easy to manufacture, control, it requires less maintenance, responses different loads. In this study, the design of 115kW (continuous 85kW) squirrel cage induction motor for electric vehicle applications is presented. Main design constraints and performance criteria of the motor is determined and depending on these...
This paper presents an empirical method for determining the axial load distribution generated by the V-band clamps around the flanges. The method utilizes a hydraulic fixture and uniquely designed flanges. The load is measured through strain gages and a pressure transducer. Tests were conducted successfully on a V-band and a nonuniform distribution of axial load was obtained, fitting well with the...
Recently multi-axis machining technology has improved significantly. It has become a widely accepted method of manufacturing components with complex, free form surfaces. Solid billet materials with negligible internal defects are used in this process. This provides increased durability and fatigue life over equivalent cast components. However, multi-axis machining using ball nose cutting tools leaves...
The use of bio-based materials for production of biocomposites is of interest due to their low cost, abundance and the fact that they are renewable and biodegradable. In this work, an epoxy matrix was produced from residual soybean oil and subsequently used in the preparation of composites reinforced with spent coffee grounds (SCG) fiber. SCG were chemically treated with alkaline hydrogen peroxide...
3D printing by the FDM method represents a progressive parts manufacturing technology using available cheap 3D printers. Basic method consists in depositing fibers from the molten plastic material in layers. Common material of the blank is based on polymers. Starting geometry is a 3D digital model of a component created in CAD or obtained by reverse engineering. FDM 3D printing method has certain...
Super carbon nanotube (SCNT) is a tubular nano-structure constructed through hierarchically assembling carbon nanotubes (Fig.1), so the performance of SCNT is determined by both the self-structure and structure of armtube CNTs. In this paper, tensile deformation mechanism of SCNT is investigated based on molecular dynamic (MD) simulation. Detailed analyses about structure evolution in different levels...
Predicting elastic properties of braided composites is useful in aerospace structures. In order to predict the properties precisely, fiber undulation and pores in the matrix must be considered during the calculation process. For pores in the matrix, they are considered as inclusions in a kind of isotropic material. Based on inclusion theory, the Mori-Tanaka method is used to predict Young's modulus...
Single crystal silicon is a popular material used for semiconductor circuits and solar batteries. In the cutting process from a silicon ingot to a silicon wafer used as semiconductor materials, a multi-wire saw with fixed diamond abrasive grains is widely used due to recent increases in wafer size and reductions in wafer thickness. Also, single crystal silicon can achieve ductile mode cutting when...
Combining multi-field information fusion theory with the ammunition feeding system, a multi-level information fusion method for fault detection and prediction is proposed in this paper. Firstly, it is studied that the occurrence and development mechanism of damage and failure of complicated ammunition feed system under rapid impact. The wear damage and stop shooting faults are diagnosed by measuring...
Titanium alloys have high strength, low density and corrosion resistance, and are used for aircraft engines and airframe manufacture. For dimensional accuracy, titanium alloy is machined using a metal removal process. High-speed cutting is an effective method for improving productivity. As the cutting temperature increases significantly in high-speed cutting, the tool materials require both good wear-resistance...
The hybrid woven fabric laminates exhibit excellent ballistic performance, however, the design method and ballistic resistance mechanism still call for investigation. The paper presents a numerical model to describe the damage behavior of woven composites, which is implemented in a VUMAT subroutine. The validity of the model is verified with experimental data for the glass-Kevlar hybrid composite...
The lattice sandwich structure is a kind of lightweight and multifunctional material with wide application prospect which can meets the heat preservation and load bearing requirements of the spacecraft. The thermo-mechanical coupling performance of two typical lattice sandwich structures, the Kagome type and the tetrahedral type were studied in this paper. Firstly, the temperature field distribution...
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