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Behavior of high strength parachute components at impact velocities up to 700 feet per second
Author(s) -
Coskren Robert J.,
Morgan Henry M.,
Chu Chauncey C.
Publication year - 1962
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.1962.070062112
Subject(s) - impact , missile , armour , instrumentation (computer programming) , displacement (psychology) , materials science , strain gauge , structural engineering , mechanics , physics , composite material , aerospace engineering , engineering , computer science , psychology , layer (electronics) , psychotherapist , operating system
A machine has been designed and constructed which is capable of evaluating high strength parachute components in the laboratory at impact speeds ranging from 200–750 ft./sec. The system consists mainly of a device for propelling various masses with photographic instrumentation for observing the impact. Measurement of missile deceleration gives applied force. Extension is measured for changes in gage marh on the test specimen. Energy absorbed can be calculated from the displacement of two ballistic pendulums. Results reveal that a t impact speeds force and strain waves are generated within the material which cause rapid changes in the forces measured. A theory has been proposed to explain this behavior. Energy measurements indicate a potential change in the stress‐strain curve of nylon webbings and joints during impact. Improvements in energy absorption result.