The Effect of a Complex Stress State on Fatigue Crack Propagation and the Orientation of the Cracking Plane in VT3-1 Aeronautical Titanium Alloy

• Autorzy: Kocańda D. , Mierzyński J.

Identyfikatory

DOI

10.2478/v10164-010-0011-0

• Języki publikacji: EN

Abstrakty

EN

The subject of the paper is the investigations of fatigue crack imitation and propagation in notched specimens made of the VT3-1 aeronautical russian titanium alloy under combined bending - torsion loading. The presence of short cracks was revealed at various ratios of bending to torsion. Experimental courses of short and long crack growth rates have been proved by the SEM and TEM micrographs which illustrated the changes in the mechanism of cracking in the examined specimens. The attempt was undertaken in order to explain partly brittle fracture that was observed in the range of fatigue short crack growth in the VT3-1 titanium alloy specimens. The results of the study of atmospheric hydrogen absorption capability and its ability for penetration inside the faces of nucleated and propagated microcracks in the surface layer allowed for suggestion that the cleavage mechanism of fracture found in the regime of short crack growth in the VT3-1 titanium alloy specimens was induced by hydrogen.

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Fatigue of Aircraft Structures
• Rocznik: 2009
• Tom: Iss. 1
• Strony: 116--130
• Opis fizyczny: Bibliogr. 7 poz., fot., rys., wykr.

Twórcy

autor

Kocańda D.

• Military University of Technology Warsaw, Poland

autor

Mierzyński J.

• Military University of Technology Warsaw, Poland

Bibliografia

• [1] Kocanda, D., Kocanda, S., & Mierzyński, J. (2000). Fatigue cracks in the VT3-1 titanium alloy notched model components [in Polish]. Military University of Technology WAT Bulletin, 5, 35-57.
• [2] Mierzyński, J. (2004) Fatigue crack growth in the VT3-1 titanium alloy under complex stress state [in Polish]. Ph. D. Thesis, Military University of Technology WAT.
• [3] Kocanda, D. (1996). The analysis of short crack growth [in Polish]. Military University of Technology WAT.
• [4] Kocanda, D. (2000). The research into short cracks. In Szala J. (Eds.), Part II. Monographies. Experimental methods in the fatigue of materials and structures. Basic investigations (pp. 59-148). Bydgoszcz: ATR.
• [5] Kocanda, D., & Kocanda, S. (1999). Initiation and short fatigue crack propagation in 45 steel [in Polish]. Mechanical Review. 8, 5-9.
• [6] Kocanda, D. (1996). Probabilistic description of fatigue short crack growth in normalized and laser hardened 0,45 % C steel elements. The Archive of Mechanical Engineering, 2(3), 2-17.
• [7] Kocańda, D., Kocańda, S., Łunarska, E., & Mierzyński, J. (2005). Possibility of hydrogenassisted propagation of short fatigue crack growth in WT3-1 titanium alloy. Physico Chemical Mechanics of Materials, 3, 25-28.