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The dynamic behavior of elastomers has led to their widespread application in the field of vibration control and isolation. Elastomeric components play a significant role in controlling vibration in the modern automobile through the use of elastomer body mounts, engine mounts, and suspension members. As this use increased and performance requirements increased, it became increasingly evident that the dynamic behavior of these components needed to be understood and controlled. Measurement methods were soon developed with the resonant beam test machine becoming one of the more widely used machines. TCAR Section 15B (later 11.65B) was organized to address itself to the problems of dynamic testing of elastomers and elastomeric components. With more and more laboratories becoming involved in dynamic testing, the problems of correlation of test results arose. The variation in the supplier and user test results created major concerns in the quality control of products. In general, the measurement of dynamic stiffness and damping of a material or component is very difficult. Any compliance of the test equipment tends to reduce the measured spring rate. Similarly, any damping in the fixtures or the machine will generally increase the measured damping. The normal variation of elastomer properties and its nonlinear behavior compounds the correlation problems. This requires careful control of the test parameters during the test. The members of TCAR have devoted considerable effort toward the correlation problem by examining “standard springs” and dashpots, conducting round-robin test programs and working toward a standard test method. At the September 1971 meeting of Section 11.65, the Committee took the official position that it would discourage the use of the resonent beam testing method and that a standard would be prepared based on the transmitted force method of testing. This action was prompted by a review of the work of A. S. Paul who had analytically studied the errors in the resonant beam test machine. His paper in this symposium describes these results in detail.
Hillberry, B. M.