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Accession Number N20120012907
Title Static Indentation Load Capacity of the Superelastic 60NiTi for Rolling Element Bearings.
Publication Date May 2012
Media Count 16p
Personal Author C. DellaCorte J. S. Clifton L. E. Moore
Abstract The nickel-rich, binary nickel-titanium alloys, such as 60NiTi (60Ni-40Ti by wt%), are emerging as viable materials for use in mechanical components like rolling element bearings and gears. 60NiTi is a superelastic material that simultaneously exhibits high hardness and a relatively low elastic modulus (approx.100 GPa). These properties result in the potential to endure extremely high indentation loads such as those encountered in bearings, gears and other mechanical components. In such applications, quantifying the load that results in permanent deformation that can affect component performance and life is important. In this paper, the static load capacity is measured by conducting indentation experiments in which 12.7 mm diameter balls made from the ceramic Si3N4 are pressed into highly polished, hardened 60NiTi flat plates. Hertz stress calculations are used to estimate contact stress. The results show that the 60NiTi surface can withstand an approximately 3400 kN load before significant denting (>0.6 microns deep) occurs. This load capacity is approximately twice that of high performance bearing steels suggesting that the potential exists to make highly resilient bearings and components from such materials.
Keywords Binary alloys
Flat plates
Modulus of elasticity
Nickel alloys
Roller bearings
Silicon nitrides
Static loads
Titanium alloys

Source Agency National Aeronautics and Space Administration
NTIS Subject Category 71N - Nonferrous Metals & Alloys
Corporate Author National Aeronautics and Space Administration, Cleveland, OH. NASA John H. Glenn Research Center at Lewis Field.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1303
Contract Number N/A

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