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Digitale Medien

Study on impact phenomenon between a sphere and a layered structure (1971)

Bayer, R. G. ; Burns, R. C.

Springer

Experimental mechanics 11 (1971), S. 461-466

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ISSN: 1741-2765

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract As part of a general investigation of impact-printing phenomenon, a series of impact experiments were performed in which the print action was simulated by a freely falling sphere impacting with a horizontal stack composed of ribbon, paper and carbon paper, backed by a steel platen. The principal quantity measured was the coefficient of restitution of the system, which is related to the energy lost during the collision process. In certain cases, a piezoelectric transducer was used to support the stack so that information about contact time and impact force could be obtained. The behavior of the coefficient of restitution as a function of stack thickness was determined, not only for the case of ribbon, paper and carbon paper, but for various thicknesses of other materials also supported by a hard-steel platen. The latter experiments were performed in order to obtain a better understanding of the nature of the collision process. In general, similar behavior was found for all materials and energies tested. The empirical results were compared with theoretical models for energy-loss mechanisms and it was concluded that the major energy-loss mechanisms were associated with plastic and viscoelastic phenomenon, rather than with traveling waves.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02327751

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Digitale Medien

Mechanochemical aspects of repetitive impacts and sliding on polymers (1979)

Sacher, E. ; Engel, P. A. ; Bayer, R. G.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 24 (1979), S. 1503-1514

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Scattered data exist in the literature on the chemical reactions which occur during mechanical contact. It is our contention that these reactions occur as a direct result of the high temperatures generated at the contact interface, due to the dissipation of mechanical energy. A theoretical analysis is used to identify and rank the various sources of heat generation during repetitive impact or sliding. New data, on both filled and unfilled polymers and elastomers, supported by data from the literature, are used to show that the resultant temperature rise causes reactions at the interface; the extents of these reactions depend on the polymer structure and the magnitude of the temperature rise. Several ways of reducing the magnitude of this temperature rise are discussed.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1979.070240611

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