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1

New Admitance to the Quality Evaluation of Steel Components Refinement

Kučerová J., Letko I.

Machine Dynamics Problems

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2006

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Vol. 30, No. 4

20-28

EN

In terms of ISO 9001, art. 49 we can qualify the heat treatment as one of so called "special processes". With these, we need to find out the identity or non-identity of the products by means of qualified exams (control of fracture surfaces on SEM). This can remarkably increase safety and durability of parts after their converting, because it guarantees the optimal ratio of strenght, plastic and brittle fracture properties. Advantages of the applied method: - Existing verified method and sufficiently augmented instrument technique (SEM). - Operatively and objectivity of the test. - Unpretentiousness of sample preparation. Relatively low price, regarding the heat treatment batch price, or complaints expenses.

2

Impact Analysis the Difference of Temperatures During Vulcanization in Relation to Parameter-Deformation Characteristics and Tyre Tarameters

Šuba I., Kučerová J., Letko I.

Machine Dynamics Problems

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2006

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Vol. 30, No. 4

146-151

EN

After processing the all six measurements on thermocouples and evaluation of Aramis measurement, I will mathematically simulate dependency the parameters setting of final tyre properties by preset the running of vulcanization process. In case of success, this will allow to change final characteristics of vulcanized product without a change of green tyre composition (to program type of characteristic the finished tyre in advance), naturally in predefined range of individual parameters.

3

Fatigue testing and equipment for tests of steel cords

Kopecky M., Cuth V., Letko I., Vavro J.

International Journal of Applied Mechanics and Engineering

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2003

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Vol. 8, no spec.

61-65

EN

The contents of the paper point out the necessity of combining the theoretical and experimental approaches in the investigation of tire load in vehicles. The models are planar and they model the cross-section of the tyre enabling the consideration of the bottom load and the internal pressure in the tyre, as well as the influence of the lateral force. The paper presents the findings, the formulations necessary for solving the task obtained in the experimental model tests and serving as a basis for comparison with the results obtained from purely theoretical approaches, e.g. by the method of finite elements, with identical load conditions.

4

Experimental investigation of tread compounds frictional properties

Slabeycius J., Kostial P., Letko I., Vavro J., Zverina M., Randa D., Sipos M.

Zeszyty Naukowe Politechniki Poznańskiej. Maszyny Robocze i Transport

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2002

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Nr 54

165-170

EN

The friction properties of vulcanized rubber were investigated. The friction force between planar sample and chosen surface at various values of sliding velocity and normal pressure was measured. The experimental equipment based on standard tensile machine 1NSTRON 4302 was used. The samples of tread compQunds and some materials (asphalt, concrete, glass, steel) were tested. The experimental dependencies of the friction coefficient to the sliding velocity show good agreement with published experimental and theoretical results.

5

Calculation and experimental determination of the tyre tread semi-product cooling

Cuth V., Kopecky M., Letko I., Valasek R., Markech V.

Zeszyty Naukowe Politechniki Poznańskiej. Maszyny Robocze i Transport

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2002

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Nr 54

41-46

EN

In article are summary results of solution research work which aim was to perform experimental measuring and calculations for preparation intermediate products of a tread cooler. Calculation was done using finite elements method.