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Adaptation of a ballistic tool for obtaining strain rates above 20,000 inch/inch/minute
Author(s) -
D'Amato D. A.
Publication year - 1964
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.1964.070080113
Subject(s) - materials science , polyethylene , piston (optics) , composite material , cantilever , strain gauge , tube (container) , strain rate , head (geology) , optics , physics , wavefront , geomorphology , geology
A low cost, dynamic tensile tester was designed and developed, using a simple ballistic piston tool as the driving force. The principal purpose of the device was to provide performance data on the response of high molecular weight, linear polyethylene subjected to strain rates between 20,000 and 50,000 in./in./min. at temperatures ranging from 75 to −40°F. Tests were made on samples of linear polyethylene, conventionally formed, and of linear polyethylene, formed by a special process, to produce a highly oriented, highly crystalline structure. Both materials were tested in the direction of forming and at right angles. Basically, the unit consists of a ballistic tool that fires a captive piston against a block to which a specimen is attached. A load cell, in series with the sample, records the developed force and a simple cantilever beam strain gauge is used to record the cross head travel. The rate of strain is controlled by the propellant charge (piston velocity) and a buffer device. The unit is relatively light and protable. For cold temperature firing, the whole unit is placed in a cold box and both the samples and the device are soaked to the desired temperature. Firing takes place in the cold box to insure uniformity of sample temperature.