A polymer waveguide with 4-channel graded-index circular cores is fabricated by the preform method. Very low loss (0.028 dB/cm at a wavelength of 850 nm) and high bandwidth (83 Gbps for 1 m, estimated) properties are experimentally demonstrated by the new waveguide for the first time. By densely aligning the cores during the preform fabrication, a waveguide with a pitch size of 56 mum and a cor...

The investigation of occupational Noise in a Petrochemical industry has been carried out. The noise levels were measured following standard procedure using calibrated sound pressure level meter Smart Sensor (Model AR854), Noise levels were measured at Gas plant, Olefin plant area, and Preform machine area of a petrochemical industry then questionnaires were designed to determine the health impa...

A closed die forging process was developed to successfully forge an automotive suspension component from AZ80 Mg at a variety of different temperatures (300 °C, 450 °C). The properties the forged were compared and contrasted with other research works on both intermediate full-scale level. monotonic response, as well stress strain-controlled fatigue behaviours, characterized for materials. Stres...

In this paper, a new equidistant filling theory based on the level set function and corresponding numerical algorithm dynamic finite difference method were proposed. Firstly, closed curve is defined as zero-value contour of function. Then, equation, partial differential was built to get function, proposed solve Secondly, three types cross sections, simple polygon, multi-island multi-hole used t...

Crankshafts are the most important loaded components in the case of an automobile. In order to achieve required mechanical properties most of crankshafts for automobile are forged with micro alloyed steel. Usually, the shapes of crankshafts are complex, and many defects are induced during the process of crankshaft forging such as under-filling, laps and folds etc. In this work the forging analy...

Calcium hexaluminate (CA6) was incorporated into the matrix of magnesio aluminate spinel-alumina (MA-A) via infiltration of a porous preform fabricated from α-Al2O3 and MgO powders with a saturated calcium acetate solution and subsequent firing, forming CA6/(MA-A) functionally composites with graded fracture toughness. Actually, the porous preform was partially and perpendicularly immersed (1/4...

Cold forging of automotive parts in high strength steel causes pressure on the die. The or heavy load reduces a die life and accuracy forged parts, so prediction more accurate helps us to design optimum dimensions process. In this report, precise frictional coefficient was measured by ring compression test predict cold upsetting steel. experimental results indicated μ about 0.19 within height r...

3D weaving is a manufacturing technique for producing near net shape fiber preforms. These preforms can be processed into composite components using liquid molding techniques such as resin transfer molding (RTM) or the vacuum assisted process (VAP). One of the main advantages of 3D woven preforms is that the touch labor required to assemble them is minimal, leading to rapid and highly automated...