Evaluation of fatigue crack growth rates in AISI 4340 steel at different load asymmetry considering effects of hardness and microstructure

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F27174841%3A_____%2F16%3AN0000008" target="_blank" >RIV/27174841:_____/16:N0000008 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.czaerospace.eu/en/2016-02-56.html" target="_blank" >http://www.czaerospace.eu/en/2016-02-56.html</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of fatigue crack growth rates in AISI 4340 steel at different load asymmetry considering effects of hardness and microstructure

Popis výsledku v původním jazyce

In the paper, results of an experimental programme on evaluation of fatigue crack growth (FCG) in heat treated AISI 4340 AQ steel are presented and discussed. The work was performed as a part of the research project MOSTA – "Modernization Of Small Transport Aircraft to increase operation effectiveness and economy", in a collaboration with the project coordinator Airsraft Industries a.s. (AI) and its main aim was to obtain experimental data and knowledge about FCG in the material as a basis for computational estimations of residual life of components made from AISI 4340 AQ steel with cracks and crack-like defects. FCG rates were evaluated using CT specimens of 75 mm width and 10 mm thickness, in T-L orientation, at load asymmetries R = 0.05, 0.2 and 0.6, respectively, in the areas of stable FCG and final failure. No effect of different load asymmetry in the stable growth area was shown, which was likely connected with no crack closure. Large scatter of FCG rates in the final growth area was probably connected with significant scatter of local material hardness and grain flow character, connected also with different fracture relief.

Název v anglickém jazyce

Evaluation of fatigue crack growth rates in AISI 4340 steel at different load asymmetry considering effects of hardness and microstructure

Popis výsledku anglicky

In the paper, results of an experimental programme on evaluation of fatigue crack growth (FCG) in heat treated AISI 4340 AQ steel are presented and discussed. The work was performed as a part of the research project MOSTA – "Modernization Of Small Transport Aircraft to increase operation effectiveness and economy", in a collaboration with the project coordinator Airsraft Industries a.s. (AI) and its main aim was to obtain experimental data and knowledge about FCG in the material as a basis for computational estimations of residual life of components made from AISI 4340 AQ steel with cracks and crack-like defects. FCG rates were evaluated using CT specimens of 75 mm width and 10 mm thickness, in T-L orientation, at load asymmetries R = 0.05, 0.2 and 0.6, respectively, in the areas of stable FCG and final failure. No effect of different load asymmetry in the stable growth area was shown, which was likely connected with no crack closure. Large scatter of FCG rates in the final growth area was probably connected with significant scatter of local material hardness and grain flow character, connected also with different fracture relief.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JU - Aeronautika, aerodynamika, letadla

OECD FORD obor

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Projekt

<a href="/cs/project/FR-TI2%2F557" target="_blank" >FR-TI2/557: Projekt MOSTA - Modernizace malého dopravního letounu za účelem zvýšení efektivnosti a ekonomie jeho provozu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

C - Předmět řešení projektu podléhá obchodnímu tajemství (§ 504 Občanského zákoníku), ale název projektu, cíle projektu a u ukončeného nebo zastaveného projektu zhodnocení výsledku řešení projektu (údaje P03, P04, P15, P19, P29, PN8) dodané do CEP, jsou upraveny tak, aby byly zveřejnitelné.

Název periodika

Czech Aerospace Proceedings

ISSN

1211-877x

e-ISSN

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Svazek periodika

2016

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

4

Strana od-do

22-25

Kód UT WoS článku

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EID výsledku v databázi Scopus

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