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

Result code in 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>
Result on the web
<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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Result language
angličtina
Original language name
Evaluation of fatigue crack growth rates in AISI 4340 steel at different load asymmetry considering effects of hardness and microstructure
Original language description
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.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JU - Aeronautics, aerodynamics, aeroplanes
OECD FORD branch
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Project
<a href="/en/project/FR-TI2%2F557" target="_blank" >FR-TI2/557: Project MOSTA - Modernization Of Small Transport Aircraft to increase operation effectiveness and economy</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2016
Confidentiality
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.

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