Investigation of the High Speed Impact Behavior of Fibrous Materials

Investigation of the High Speed Impact Behavior of Fibrous Materials PDF

Author: Robert J. Coskren

Publisher:

Published: 1966

Total Pages: 96

ISBN-13:

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A group of Nomex and glass webbings were evaluated for impact tensile behavior at testing speeds of 200 to 700 feet per second. It was found that the impact energy absorption of Nomex webbings decreases with increasing testing speed until at 700 feet per second there may be experienced a loss as much as 88 percent of the static value. Elevated temperature exposure of Nomex webbing in a freely relaxed condition prior to impact testing appears to be helpful in improving performance at both 500 and 700 feet per second, but is of little importance at 200 feet per second. Glass webbings, while poorer on a weight basis than Nomex, showed improvements in energy absorption capability with increased testing speed, one spliced sample indicating almost a tenfold increase over its static energy value. (Author, modified-PL).

Environmental Testing Techniques for Electronics and Materials

Environmental Testing Techniques for Electronics and Materials PDF

Author: Geoffrey W. A. Dummer

Publisher: Elsevier

Published: 2013-10-22

Total Pages: 473

ISBN-13: 1483135918

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Environmental Testing Techniques for Electronics and Materials reviews environmental testing techniques for evaluating the performance of electronic equipment, components, and materials. Environmental test planning, test methods, and instrumentation are described, along with the general environmental conditions under which equipment must operate. This book is comprised of 15 chapters and begins by explaining why environmental testing is necessary and describing the environment in which electronics must operate. The next chapter considers how an environmental test plan is designed; the methods for the environmental testing of components and materials; instrumentation and control of test chambers; shock and vibration test instrumentation; and requirements for specification writing. The reader is then introduced to factors that might affect the reliability of equipment, including high humidity environment; galvanic corrosion problems; high- and low-temperature environments; mechanical and associated hazards; transport hazards; and long-term storage. Problems posed by high altitude and space environments, nuclear radiation, and acoustic noise are also discussed. The final chapter is devoted to environmental protection techniques and looks at the effects of climatic environments on radio interference as well as the effects of the environment on the human operator. This monograph will be of value to materials scientists and electronics engineers as well as those engaged in the design, development, and production of professional and military equipment.

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