Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781119126317
Author: Richard S. Figliola; Donald E. Beasley
Publisher: Wiley Global Education US
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Chapter 5, Problem 5.57P
A sensitive material is to be contained within a glovebox. Codes require that the transparent panels that make up the walls of the glovebox withstand the impact of a 22-kg mass falling at 8 m/s. An impact test is performed where the 22 kg mass is dropped a known variable height onto a panel. The mass motion is sensed by photocells from which an impact velocity is estimated. The mean kinetic energy for failure was 717 N-m, with a standard deviation of 60.7 N-m based on 61 failures. The systematic uncertainty in mass is 0.001 kg (95%). The velocity at impact is 8 m/s. with a systematic uncertainty in velocity estimated as 0.27 m/s (95%). Estimate the combined standard uncertainty and the expanded uncertainty at 95% in the kinetic energy for failure. Assume a normal distribution of errors.
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Chapter 5 Solutions
Theory and Design for Mechanical Measurements
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