Calibration of the Ductile Failure Criterion for Nickel-Based Superalloys taking into Account the Localization of the Strain

• Autorzy: Madejski B. , Socha G.

Identyfikatory

DOI

10.1515/fas-2017-0003

• Języki publikacji: EN

Abstrakty

EN

Static tension test allows characterization of material strength properties. This simple test provides input data for numerical calculation of structural components made of the tested alloy. Elastic, plastic and failure behavior of the structural component in question is simulated, using, for example, the FEM package, based on parameters obtained as the result of tensile testing. When using the results of the tensile test for modeling the material failure it is important to estimate correctly plastic strain corresponding to failure. It is common practice to use elongation of the specimen gage part for the calculation of failure strain. On the other side, the most popular ductile failure criterion used by engineers performing numerical simulation of the material’s behavior relies on the equivalent plastic strain as the criterial quantity. Those two parameters can differ significantly. In order to calculate the equivalent plastic strain correctly, we have to remember about strain localization (necking) appearing during tensile tests and take into account the fact that during tensile testing we have three non-zero strain tensor components. Ignoring this fact, and using only elongation as the criterial quantity can lead to enormous simulation error. This error is analyzed in this paper for nickel based superalloy tested at elevated temperatures.

Słowa kluczowe

EN

equivalent plastic strain; tensile test; failure criterion

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Fatigue of Aircraft Structures
• Rocznik: 2017
• Tom: Iss. 9
• Strony: 27--37
• Opis fizyczny: Bibliogr. 9 poz., fot., rys., tab., wykr., wzory

Twórcy

autor

Madejski B.

• Institute of Aviation, Warsaw, Poland

autor

Socha G.

• Institute of Aviation, Warsaw, Poland

Bibliografia

• [1] von Karman Th, Festigkeitversuche unter allseitigem Druck, Z. des Ver. Deutsch ingenieurie, 55 (1911), pp. 1794 – 1757.
• [2] Johnson GR, Cook WH., Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures. Engineering Fracture Mechanics (1985); 21(1):31–48.
• [3] Cockcroft MG, Latham DJ. Ductility and the workability of metals. Journal of the Institute of Metals, (1968); 96:33–9.
• [4] Wilkins ML, Streit RD, Reaugh JE. Cumulative-strain-damage model of ductile fracture: simulation and prediction of engineering fracture tests. Technical Report UCRL-53058, Lawrence Livermore National Laboratory; October 1980.
• [5] Tomasz Wierzbicki, Yingbin Bao, Young-Woong Lee, Yuanli Bai. Calibration and evaluation of seven fracture models, Impact and Crash worthiness Laboratory, Massachusetts Institute of Technology.
• [6] PN-EN ISO 6892-1:2016-09 - Metale -- Próba rozciągania -- Część 1: Metoda badania w temperaturze pokojowej.
• [7] PN-EN ISO 6892-2:2011 – Metale – Próba rozciągania – Część 2: Metoda badania w podwyższonej temperaturze.
• [8] ASTM E8/E8M – 16A – Standard Test Methods for Tension Testing of Metallic Materials.
• [9] ASTM E21 – 09 – Standard Test Methods for Elevated Temperature Tension Tests of Metallic Materials.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).