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Interactions Between Friction-Induced Vibration and Wear. Final Report, May 15, 1982-May 15, 1984.

DE85007696

Publication Date	1985
Personal Author	D'Souza, A. F.; Aronov, V.; Kalpakjian, S.; Shareef, I.; Dweib, A. H.
Page Count	50
Abstract	The interactions among friction, wear, and system dynamics have been investigated for dry sliding contact between a steel pin and a cast iron disk. The system was equipped with force and displacement transducers to measure the contact forces and the displacements in three directions. As the normal load increased, four different regimes were observed, the steady state friction regime, the nonlinear friction regime, transient friction regime, and the self-excited vibration regime. The last regime is characterized by periodic oscillations of the slider and high wear rate. The experimental setup was modified for further detailed study of this regime. The recorded wave forms showed that the oscillations consist of a fundamental harmonic with a frequency close to the system natural frequency in torsion and its second harmonic. A mathematical model was developed for the system including the coupling between the different degrees of freedom and a nonlinear contact stiffness, and the model was analyzed using triple input describing functions to include the constant, fundamental, and second harmonics. The model showed the existence of limit cycling at a frequency close to the torsional frequency of the system with amplitudes close to those observed experimentally. The results of this study enhance our understanding of friction induced vibrations and interactions which give rise to instability. (ERA citation 10:018844)
Keywords	Steels Cast Iron Friction Mathematical Models Mechanical Vibrations Tribology Wear ERDA/420100
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	71J - Iron & Iron Alloys 41L - Tribology 46E - Structural Mechanics 71L - Materials Degradation & Fouling
Corporate Authors	Illinois Inst. of Tech., Chicago.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	198513
Contract Number	AC02-82ER12071

Interactions Between Friction-Induced Vibration and Wear. Final Report, May 15, 1982-May 15, 1984.

Interactions Between Friction-Induced Vibration and Wear. Final Report, May 15, 1982-May 15, 1984.
DE85007696

Publication Date	1985
Personal Author	D'Souza, A. F.; Aronov, V.; Kalpakjian, S.; Shareef, I.; Dweib, A. H.
Page Count	50
Abstract	The interactions among friction, wear, and system dynamics have been investigated for dry sliding contact between a steel pin and a cast iron disk. The system was equipped with force and displacement transducers to measure the contact forces and the displacements in three directions. As the normal load increased, four different regimes were observed, the steady state friction regime, the nonlinear friction regime, transient friction regime, and the self-excited vibration regime. The last regime is characterized by periodic oscillations of the slider and high wear rate. The experimental setup was modified for further detailed study of this regime. The recorded wave forms showed that the oscillations consist of a fundamental harmonic with a frequency close to the system natural frequency in torsion and its second harmonic. A mathematical model was developed for the system including the coupling between the different degrees of freedom and a nonlinear contact stiffness, and the model was analyzed using triple input describing functions to include the constant, fundamental, and second harmonics. The model showed the existence of limit cycling at a frequency close to the torsional frequency of the system with amplitudes close to those observed experimentally. The results of this study enhance our understanding of friction induced vibrations and interactions which give rise to instability. (ERA citation 10:018844)
Keywords	Steels Cast Iron Friction Mathematical Models Mechanical Vibrations Tribology Wear ERDA/420100
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	71J - Iron & Iron Alloys 41L - Tribology 46E - Structural Mechanics 71L - Materials Degradation & Fouling
Corporate Authors	Illinois Inst. of Tech., Chicago.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	198513
Contract Number	AC02-82ER12071