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This paper presents experimental results of the fracture toughness tests carried out on metal matrix composites. The material was produced using the 44200 aluminium alloy reinforced by Al2O3 in the form of Saffil fibres. Three different contents of Al2O3 were taken into account, i.e. 10%, 15%, 20%. The main aim of the research was to examine an influence of the aluminium oxide content on a critical value of the stress intensity factor, KIC. All tests were performed using a miniature compact specimen, which was four times smaller than the typical one. The results of FEA analysis confirmed a typical distribution of the effective stress at the tip of the notch. In each test the composite specimen was mounted in the loading system of the testing machine by applying special grips. Crack tip opening displacement of the specimen notch was measured by means of the clip on knife edge extensometer having 10mm gauge length. The results in form of tensile force versus crack tip opening displacement show the first mode of fracture. An inspection of the pre-cracked zone of the composite did not exhibit the typical features usually observed on specimen surface after fatigue. An influence of the Al2O3 Saffil fibres content within the range from 10% to 20% on a critical value of the stress intensity factor was negligible small. The KIC of the composites tested in this research achieved the level of 12 MPa m1/2.
Czasopismo
Rocznik
Tom
Strony
219--229
Opis fizyczny
Bibliogr. 12 poz., rys., wykr.
Twórcy
autor
- Motor Transport Institute Centre for Material Testing and Mechatronics Jagiellońska 80, 03-301 Warsaw, Poland
autor
- Motor Transport Institute Centre for Material Testing and Mechatronics Jagiellońska 80, 03-301 Warsaw, Poland
- Institute of Fundamental Technological Research PAN Department for Strength of Materials Pawińskiego 5B, 02-106 Warsaw, Poland
Bibliografia
- 1. Dobrzański L., Nowosielski R., Testing of metals and alloys, vol. I, “Investigations of mechanical and physical properties” [in Polish], Silesia University of Technology, Gliwice 1986.
- 2. Doga B., Ceyhan U., Nikbin K.M., Petrovski B., Dean D.W., European code of practice of creep crack initiation and growth testing of industrial relevant specimens, Journal of ASTM International, 3, 2, 20, 2006.
- 3. Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials, Annual Book of ASTM Standards, Metals Test Methods and Analytical Procedures, Metals- Mechanical Testing: Elevated and Low-Temperature Tests, Metallography, 03.01, 509–539, 1993.
- 4. Kalluri S., Telesman J., Characterization of fatigue crack initiation and propagation in Ti-6A1-4V with electrical potential drop technique, NASA Technical Memorandum 100877, July 1988.
- 5. Golerthan S., Herberg D., Baruj A., Eggeler G., Compact tension testing of martensitic/pseudoplastic NiTi shape memory alloys, Materials Science Engineering, 481–482, 156–159, 2008.
- 6. Bajaj D., Sundaram N., Arola D., Striations resulting from fatigue crack growth in dentin, [in:] Fractography of Glasses and Ceramics V: Ceramic Transactions, James R. Varner, George D. Quinn, Marlene Wightman, 199, 2007.
- 7. Dieringa H., Hort N., Kainer K.U., Compression creep of short fibre reinforced magnesium alloy AE42, Composites, 3, 7, 275–278, 2003.
- 8. Naplocha K., Kaczmar J.W., Tribological properties of Al 7075 alloy based composites strengthened with Al2O3fibres, Archives of Foundry Engineering, 11, Special Issue 2, 30/2, 153–158, 2011.
- 9. http://www.saffil.com/index/fibre home/property information.aspx.
- 10. Samuel M., Reinforcement of recycled aluminium-alloy scrap with Saffil ceramic fibres, Journal of Materials Processing Technology, 142, 295–306, 2003.
- 11. PN-EN 1676:2011, Aluminium and aluminium alloys – Alloy ingots for remelting – Specifications, 2011.
- 12. PN-EN ISO 12737: 2011, Metals – Fracture toughness at biaxial strain state, 2011.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-5af5c6f6-5240-4786-aae0-63005a29ec39