Publication detail
Identification of Acoustic Emission Sources in Early Stages of Fatigue Process of Inconel 713LC
VLAŠIC, F. BÁRTKOVÁ, D. MAZAL, P.
Czech title
Identifikace zdrojů akustické emise v raných stádiích únavového procesu v Inconelu 713LC
English title
Identification of Acoustic Emission Sources in Early Stages of Fatigue Process of Inconel 713LC
Type
conference paper
Language
en
Original abstract
Inconel 713LC is low carbon variant of Inconel 713 nickel-based cast alloy. The biggest advantage of these alloys is their ability to resist a wide variety of operating conditions (corrosive environment, high temperature, high stresses). Main area of applications is aircraft, energetic, chemical and petrochemical industry etc. In many applications, components undergo cyclic stresses. This study presents results of acoustic emission response of Inconel 713LC during high-cycle fatigue testing. In comparison with low-cycle fatigue, stage of initiation of micro cracks is in high-cycle region much more significant and can take several tens of percent of whole fatigue life. This work is focused on comparison of selected parameters of acoustic emission signal in pre-initiation and initiation stage of fatigue crack creation. Signal data were specified by linear location technique, hence only signal from shallow notch was analysed. Acoustic emission signal was correlated with frequency of load reversals which is a function of specimen's rigidity (modulus). Acoustic emission hits with higher stress were detected in pre-initiation stage whereas initiation stage hits exhibited low stress. Acoustic emission signal measurements are supplemented by fractographic and metallographic analysis.
Czech abstract
Inconel 713LC je nízkouhlíková varianta Inconelu 713 lité slitiny na bázi niklu. Největší výhodou těchto slitin je jejich schopnost odolávat široké škále provozních podmínek (korozivní prostředí, vysoká teplota, vysoká napětí). Hlavní oblast využití je letecký, energetický, chemický a petrochemický průmysl. V mnoha aplikacích jsou součásti vystaveny cyklickému namáhání. Tato práce prezentuje výsledky odezvy akustické emise Inconelu 713LC během vysokocyklové únavy. Ve srovnání s nízkocyklovou únavou, stádium iniciace mikrotrhlin ve vysokocyklové oblasti je mnohem významnější a může trvat i několik desítek procent celého únavové životnosti. Tato práce je zaměřena na srovnání vybraných parametrů signálu akustické emise v pre-iniciační a iniciační fázi vzniku únavové trhliny. Zdroje signálů akustické emise byly vyhodnocovány za použití lineární lokalizace. Tudíž byly analyzovány pouze relevantní signály přicházející z místa mělkého vrubu. Signál akustické emise byl korelován se zatěžovací frekvencí únavového zařízení, která je funkcí tuhosti zkušebního tělesa. Vyšší amplituda hitů akustické emise převládala v pre-iniciační fázi, zatímco v iniciační zase převládaly hity s nižší amplitudou. Měření signálu akustické emise jsou doplněna fraktografickou a metalografickou analýzou.
English abstract
Inconel 713LC is low carbon variant of Inconel 713 nickel-based cast alloy. The biggest advantage of these alloys is their ability to resist a wide variety of operating conditions (corrosive environment, high temperature, high stresses). Main area of applications is aircraft, energetic, chemical and petrochemical industry etc. In many applications, components undergo cyclic stresses. This study presents results of acoustic emission response of Inconel 713LC during high-cycle fatigue testing. In comparison with low-cycle fatigue, stage of initiation of micro cracks is in high-cycle region much more significant and can take several tens of percent of whole fatigue life. This work is focused on comparison of selected parameters of acoustic emission signal in pre-initiation and initiation stage of fatigue crack creation. Signal data were specified by linear location technique, hence only signal from shallow notch was analysed. Acoustic emission signal was correlated with frequency of load reversals which is a function of specimen's rigidity (modulus). Acoustic emission hits with higher stress were detected in pre-initiation stage whereas initiation stage hits exhibited low stress. Acoustic emission signal measurements are supplemented by fractographic and metallographic analysis.
Keywords in Czech
metoda akustické emise, stádia únavy, trhlina
Keywords in English
acoustic emission method, stages of fatigue, crack
RIV year
2014
Released
03.09.2014
Publisher
DGZfP and EWGAE
Location
Dresden, Germany
ISBN
978-3-940283-63-4
Book
31st Conference of the European Working Group on Acoustic Emission (EWGAE)
Edition number
1
Pages from–to
P3-1–P3-7
Pages count
7
BIBTEX
@inproceedings{BUT109835,
author="František {Vlašic} and Denisa {Bártková} and Pavel {Mazal},
title="Identification of Acoustic Emission Sources in Early Stages of Fatigue Process of Inconel 713LC",
booktitle="31st Conference of the European Working Group on Acoustic Emission (EWGAE)",
year="2014",
month="September",
pages="P3-1--P3-7",
publisher="DGZfP and EWGAE",
address="Dresden, Germany",
isbn="978-3-940283-63-4"
}