VIBROACOUSTICAL STUDY OF LOCAL POROSITY IN ALUMINUM CASTINGS

Ivan Kolarov

Scientific paper ID 1896 : 2019/3

VIBROACOUSTICAL STUDY OF LOCAL POROSITY IN ALUMINUM CASTINGS

Ivan Kolarov

The problem with internal and masked incompleteness in aluminum castings is up to date and is one of the reasons for reducing the resource of products. The concentration of pores in a small part of the casting causes of a slight change in its weight and is difficult to register. In the process of testing aluminum details with proven leakage disturbances, vibro-acoustic deviations have been recorded, which are can not be explained by the existence of internal incompleteness.

The aim of the present work is to perform a vibro-acoustic study of aluminum casting with porous local plots.

The purpose of the work is achieved by dividing a 3D model of a studied sample into a CAD environment as a assembled unit, consisting of two parts: a main structure and a section with proven cases of frequently registered internal cracks. For each part of the model, elastic features are set according to the solution sought.

The resonance frequencies of the model with porosity were calculated with partial porosity and elastic features of aluminum as determined by other authors. The obtained theoretical results were compared with experimental data from a vibro-acoustic study of samples with proven leakage in the critical part and of equal mass, measured with a resolution of 1 g of the weight.

The results obtained are used to explain the observed differences between the theoretical and experimental study of the vibro-acoustic behavior of the specimen.

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Виброа-акустичнаа диагностика на локални порести зони в отлети от алуминиева сплав машинни елементиVibro-acoustical diagnostics of local porous zones in cast aluminum alloy machine parts.Ivan Kolarov

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