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The effect of response time on instrumented Charpy impact data obtained on unidirectional Borsic-aluminum composites has been examined. It has been shown that the use of filters to eliminate high-frequency noise in the load-time traces obtained can significantly increase the response time of the testing system and lead to grossly inaccurate data. The current results indicate that as the response time is increased, the load is attenuated, the time to fracture is increased, and the absorbed energy is unaffected. The attenuation characteristics of the testing system can be documented through the use of a sine wave generator. These characteristics can be used both as a guide to ensure the adequacy of the system response time for future testing and as a means of correcting attenuated data which were obtained on a testing system with excessive filtering (inadequate response times).
impact tests, electronic filtering, composite materials, response time
Sandia Laboratories, Albuquerque, N. Mex.