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1

Experimental and numerical study on the effect of creep behavior on epoxy composites reinforced with yttrium oxide powder

Abed B. H., Jadee K. J., Battawi A. A.

International Journal of Applied Mechanics and Engineering

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2020

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Vol. 25, no. 4

203--213

EN

The creep test is one of the important approaches to determining some mechanical properties of composite materials. This study was carried out to investigate the creep behaviour of an epoxy composite material that was reinforced with Y2O3 powder at weight ratios of 2%, 7%, 12%, 17% and 22%. Each volume ratio was subjected to five loads over the range of 1N to5N at a constant temperature of 16 ± 2°C. In this work, creep behaviour, stress and elasticity modulus were studied through experimental and numerical analyses. Results showed that increasing the weight ratio of Y2O3 powder enhanced creep characteristics.

2

Investigation of forced frequency in a commercial vehicle suspension system

Kumar S. D., Kumar S. S., Kumar K. A.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 4

967--974

EN

Vehicle suspension plays a vital role in maintaining the center of gravity to achieve perfect balancing of the vehicle to provide the comfortable ride. While designing the suspension system of automobile, vibration is the main aspect to be considered. This paper aims to analyze the automobile front and rear suspension for a four wheeler using analytical and numerical approach. Existing details of the suspension is collected using the concept of reverse engineering. Natural and forced frequency of the front and rear suspension system is calculated theoretically based on the collected data's. The natural frequency and forced frequency is numerically computed for front and rear suspension. The amplitude of vibration is reduced by replacing the spring material and its forced frequency is reduced by 1.18% and 1.56% for front and rear suspension system respectively. This result reveals that low carbon steel has ability to reduce the forcing frequency and can produce comfort ride.

3

Simulation Tests of the Welding Machine Secondary Circuit

Stępień M., Mikno Z., Grzesik B.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2017

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Vol. 61, No. 5

27--32

EN

The article discusses the analysis of circuit parameters and power losses in the secondary circuit of the welding machine. The analysis was based on FEM calculations performed using the ANSYS Mechanical APDL software programme. The tests resulted in the determination of the inductance of the secondary circuit of welding machine horns as the function of the overall dimensions of the above-named circuit. The foregoing made it possible to identify the current response of the circuit to applied DC rated voltage. The determination of power losses included the identification of the distribution of potentials (voltage drops) along welding machine horns, and, subsequently, the determination of the correlation of input power, output power and system efficiency. The tests involved the identification of primary sources of power losses, i.e. mechanical connections, mainly between electrodes and horns as well as in the elastic joint.

PL

Artykuł poświęcony jest analizie parametrów obwodowych oraz strat mocy obwodu wtórnego zgrzewarki rezystancyjnej. Analizę oparto na wynikach obliczeń numerycznych MES przeprowadzonych z wykorzystaniem oprogramowania ANS YS Mechanical APDL. W ramach badań wyznaczono indukcyjność obwodu wtórnego ramion zgrzewarki jako funkcję gabarytów tego obwodu. Na tej podstawie ustalono odpowiedź prądową obwodu na przyłożone napięcie znamionowe DC. W zakresie strat mocy wyznaczono rozkład potencjałów (spadków napięcia) wzdłuż ramion zgrzewarki, a na tej podstawie zależności mocy wejściowej, wyjściowej i sprawności układu. Określono główne źródła strat mocy, którymi są połączenia mechaniczne, w szczególności miedzy elektrodami i ramionami, ale także w połączeniu sprężystym.