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Dynamic testing of elastomer mountings
Author(s) -
Cardillo R. M.
Publication year - 1964
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1964.070080104
Subject(s) - transmissibility (structural dynamics) , dynamic testing , natural rubber , elastomer , vibration , materials science , butyl rubber , shock (circulatory) , structural engineering , acoustics , vibration isolation , composite material , engineering , medicine , physics
Elastomer mountings are used extensively for impact and shock absorption and for the control of noise and vibration. Dynamic testing has become increasingly important in the formulation, design and evaluation of effective mount materials. A servocontrolled hydraulic tester has been used for the forced vibration testing of various elastomer compounds. The essential dynamic properties of such materials can be obtained directly over a broad range of operating conditions. Frequency, amplitude, and preload can be independently controlled and different test temperatures can be obtained through the use of an insulated control chamber. A production type automotive engine mount was used for most of the tests. Experimental compounds were molded into test mounts and checked for dynamic spring rate and coefficient of damping. The effect of different operating conditions such as frequency, amplitude, preload, and temperature on the dynamic properties of butyl mounts is described. Data are also presented on the role of compounding in altering the properties of mounts. Some data are also presented on the characteristics of natural rubber, SBR, and EPR mounts. The dynamic properties of the mount determine its performance features in a mounting system. The transmission of forces in a simple mounting system can be calculated using dynamic property data and the appropriate transmissibility equation. This has been done for several of the mounts tested and the vibration isolation characteristics of each are discussed. The data illustrate the effect of mount properties on transmissibility.