Evaluation of Damage Degree of Inconel 718 using Nondestructive Indicators of Damage

• Autorzy: Krysztofik J.

Identyfikatory

DOI

10.1515/fas-2016-0003

• Języki publikacji: EN

Abstrakty

EN

This paper presents the results of the quantitative evaluation of the degree of damage caused by plastic strain accumulated in static tensile tests and creep tests. To detect changes in the structure of the material and in order to determine the degradation of the materials, nondestructive methods were used, namely the ultrasonic and eddy current methods. In ultrasonic testing, attenuation and acoustic birefringence were used as damage indicators. In the case of the eddy current method, changes in the phase angle of impedance were observed in the material. The material tested was Inconel 718 alloy. Inconel alloys are often find application in extreme working conditions including in the power engineering industry, aviation and aerospace. A new type of specimen with the variable cross-sectional area of the measuring part was used in the tests. This allowed researchers to obtain a continuous distribution of plastic strain and enabled analysis of the material with respect to different damage degrees. The correlation between the degree of damage, expressed by the measure of deformation, and the value of nondestructive indicators was determined. On the basis of it, the dependence indicating the ability to nondestructive evaluation of the degradation degree of the material, subjected to loads exceeding the yield limit was obtained.

Słowa kluczowe

EN

damage parameter; nondestructive testing; Inconel 718

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Fatigue of Aircraft Structures
• Rocznik: 2016
• Tom: Iss. 8
• Strony: 55--64
• Opis fizyczny: Bibliogr. 7 poz., rys., wykr., wzory

Twórcy

autor

Krysztofik J.

• Institute of Aviation, Al. Krakowska 110/114, Warsaw, Poland

Bibliografia

• [1] Bray D. E. & McBride D. (1992). Nondestructive testing techniques, A Wiley-Interscience Publication, John Wiley & Sons, Inc.
• [2] Dietrich L. (2003). Process and parameters of damage of engineering materials, IPPT PAN, Nieniszczące badania materiałów, Zakopane, www.ndt-imbn.com
• [3] Johnson G. R. (1980). Materials Characterization for computations involving severe dynamic loading, Proc. Army Symp. Of Solid Mechanics, pp. 62-67, Cape Cod, Mass.
• [4] Krysztofik J., Socha G. & Kukla D. (2015). Evaluation of the damage degree of Inconel 718 with the use of eddy currents, Przegląd Spawalnictwa, Vol. 87, No 12.
• [5] Krysztofik, J., Manaj, W. & Socha, G. (2015). The Application of Acoustic Anisotropy to Evaluation of Material Properties. Fatigue of Aircraft Structures, 2015(7), pp. 5-11. Retrieved from doi:10.1515/fas-2015-0001
• [6] Socha G., Madejski B., Krysztofik J. & Czarnewicz S. (2014). Method for testing the damage of material structure caused by permanent deformation of the specimen subjected to tensile test and the specimen for testing the damage of material structure, Polish Patent Office, nr P-409294.
• [7] Yang L. & Fatemi A. (1998). Cumulative Fatigue Damage Mechanisms and Quantifying Parameters: A Literature Review, American Society for Testing and Materials.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).