Wyniki wyszukiwania - BazTech

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Local damages during rolling and mechano-rolling fatigue for the mechanical system shaft : roller (0.45 carbon steel – 25XGT steel, 20XH3A steel – 20XH3A steel)

Bogdanovich A., Yelovoy O., Sosnovskiy L., Komissarov V., Tyurin S.

Acta Mechanica et Automatica

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2015

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Vol. 9, no. 4

259--264

EN

The report provides a description of local damages which are formed in the process of wear-fatigue tests. The analysis of local surface wave-like damages during rolling and mechano-rolling fatigue for the shaft-roller mechanical system under steady-state and multistage loading conditions is given. It is shown that the study of local wear-fatigue damage was made possible by new methods of testing and measuring wear-fatigue tests and damages, which are described in the report. New characteristics to estimate the parameters of the local wear-fatigue damage are proposed. The concept of local fatigue curves is introduced. The laws of local wear-fatigue damage for the shaft - roller system are analysed.

2

Predicting residual bagging bend height of knitted fabric using fuzzy modelling and neural networks

Jaouachi B, Louati H., Hellali H.

Autex Research Journal

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2010

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Vol. 10, no. 4

110--115

EN

In this research, fuzzy modelling and neural network methods were used and compared to predict the residual bagging bend height of knitting fabric samples. Studies undertaken to minimize the bagging phenomenon vary significantly with the test conditions including the experimental field of interest, the input parameters and the applied method. Hence, we attempt to formulate a theoretical model of predicting bagging behaviour in our experimental design of interest. By analysing the bend height of overall bagging samples, this paper provides an effective neural network model to evaluate and predict the residual bagging bend height of the knitting specimens after test. It also provides the impact of each input parameter in our experimental field of interest to simulate this phenomenon after use. Moreover, the contribution of these influential input parameters was analysed and discussed. Nevertheless, our results show that residual bagging height decreases when yarn contains elastane filament, Spandex©. This finding is in agreement with Mirostawa et al. [11] that with an increase of the elastane content in fabric, permanent bagging decreases, whereas elastic bagging increases. According to the analytical results obtained, the neural network model gives a more accurate prediction than the fuzzy one.

3

Experimental complex for material impact strength researches

Astanin V. V., Olefir G. O., Balalaey A. V.

Journal of KONES

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2008

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Vol. 15, No. 1

17-28

EN

The objective has been stated to investigate the capability of materials and structures to with stand to impact loading. Computerized research complex has been developed and manufactured to carry out experiments on impact interaction of specimen with an accelerated to a certain velocity piercer. The complex includes ,,GANCHEN"-type thermogas ballistic gun for piercer accelerating, piercer velocimeter, ballistic pendulum for measurement of integral energy datum of piercer-specimen interaction, and ,,ODD" device for measurement of residual deformation of the specimen. The experiment progress control, gaging equipment sensor signal processing and obtained information data storage are accomplished at researches. The elaborated system and research techniques permit carrying out a series of comparative check tests of specimens of different metal-composite constructions. Measurement of damages of a multilayer composite surface, the principal scheme of the thermal gas ballistic laboratory installation, basic and structural schemes of optical detector of deformations ODD-C, dependence of the optical gauge displacement, a screenshot of the developed software for the ,,ODD" device operation, the scheme of the contactless surface deformation damages scanning method, calculation algorithm of the scanned surface coordinates, appearance of the material samples after punching with a spherical piercer and computer representation of measurements of damaged zones, results of research of metal-plastic composites, increase of ability of samples to absorb the energy of the sphere, discrete character of deformation distribution are presented in the paper.