<abstract xmlns="http://www.w3.org/1999/xhtml">Structural properties of materials change under stress, temperature and work environment. These changes are generally unfavorable. They cause a reduction in strength of materials. This has an impact on the safety and service life of machines and constructions.In the chemical and petrochemical industry the destruction of a structure can be activated by chemical substances. In the energy industry, a key element in assisting the destruction is temperature. In aviation, the typical cause of damage is the process of fatigue. Regardless of the differences regarding/concerning the mechanisms of degradation, typical of the sectors of industry, the end result is the emergence of microvoids and microcracks in the material. In the final phase of the process, dominant cracks are formed.The term of measure of material damage, introduced by Kachanov and Rabotnow, can be effectively used also when considering the impact of microdamages on measurable macroscopic acoustic quantities. A damage parameter proposed by Johnson allows to correlate changes in acoustic birefringence of the material with the parameter describing the degree of damage.In this article the authors presented the nondestructive tests results concerning Inconel 718 alloy subjected to damage caused by plastic deformation. This paper focuses on the evaluation of acoustic properties in relation to the degradation of the materials tested.</abstract>

Structural properties of materials change under stress, temperature and work environment. These changes are generally unfavorable. They cause a reduction in strength of materials. This has an impact on the safety and service life of machines and constructions.In the chemical and petrochemical industry the destruction of a structure can be activated by chemical substances. In the energy industry, a key element in assisting the destruction is temperature. In aviation, the typical cause of damage is the process of fatigue. Regardless of the differences regarding/concerning the mechanisms of degradation, typical of the sectors of industry, the end result is the emergence of microvoids and microcracks in the material. In the final phase of the process, dominant cracks are formed.The term of measure of material damage, introduced by Kachanov and Rabotnow, can be effectively used also when considering the impact of microdamages on measurable macroscopic acoustic quantities. A damage parameter proposed by Johnson allows to correlate changes in acoustic birefringence of the material with the parameter describing the degree of damage.In this article the authors presented the nondestructive tests results concerning Inconel 718 alloy subjected to damage caused by plastic deformation. This paper focuses on the evaluation of acoustic properties in relation to the degradation of the materials tested.

The Application of Acoustic Anisotropy to Evaluation of Material Properties

Institute of Aviation, Al. Krakowska 110/114, 02-256 Warsaw, Poland

Fatigue of Aircraft Structures

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"The Application of Acoustic Anisotropy to Evaluation of Material Properties"}

Structural properties of materials change under stress, temperature and work environment. These changes are generally unfavorable. They cause a reduction in...

The Application of Acoustic Anisotropy to Evaluation of Material Properties

Published Online: Jun 30, 2016

Page range: 5 - 11

DOI: https://doi.org/10.1515/fas-2015-0001

Keywords
nondestructive testing, acoustic birefringence, damage parameter, Inconel 718

© 2015 Józef Krysztofik et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The Application of Acoustic Anisotropy to Evaluation of Material Properties

Published Online: Jun 30, 2016

Page range: 5 - 11

DOI: https://doi.org/10.1515/fas-2015-0001

Keywordsnondestructive testing, acoustic birefringence, damage parameter, Inconel 718

© 2015 Józef Krysztofik et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
nondestructive testing, acoustic birefringence, damage parameter, Inconel 718