Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1993-05-03
1994-10-04
Noland, Thomas P.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73806, G01N 308
Patent
active
053515536
ABSTRACT:
A flywheel tensile testing apparatus for viscoelastic materials is used for high-rate tensile testing to determine the mechanical properties such as the initial modulus, the stress-strain characteristics, energy at break, and void formation of energetic materials such as solid propellants and plastic bonded explosives under deformation rates in excess of 20,000 inches per minute. The tensile tester is comprised of a plurality of support trestles which are mounted on a common base. A flywheel and a light weight engagement wheel are mounted for rotation on the support trestles. A clutch and rotor assembly is located between the flywheel and the light weight engagement wheel so that when the clutch is engaged, the stored energy of the flywheel is transferred to a rotor assembly which in turn drives the light weight engagement wheel. The flywheel is driven by a variable speed motor. The activation of the clutch and rotor assembly are preferably performed in response to an electronic signal. A stretching mechanism for elongating the viscoelastic test specimen is located proximate the light weight engagement wheel and further positioned so as to tangentially align the viscoelastic test specimen with the light weight engagement wheel. The light weight engagement wheel is initially in a stationary or stopped position. When activated, the light weight engagement wheel quickly ramps up to the desired speed and engages the stretching mechanism which initiates the high rate tensile test on the viscoelastic test specimen.
REFERENCES:
patent: 4266424 (1981-05-01), Muenstedt
High Strain Rate Mechanical Testing of Solid Propellants by the Hopkinson Split Bar Technique by: E. James & D. Breithaupt Feb. 16, 1984.
Jannaf Structures and Mechanical Behavior Working Group 14th Meeting 1977 vol. 1 15-17 Feb. 1977 The John Hopkins University Applied Physics Laboratory.
Navy Case No. 69643 Flywheel Tensile Tester Albert Lepie.
Boyack R. Allen
Hudson Frank E.
Lepie Albert H.
Sawyer Larry D.
Forrest, Jr. John L.
Hampsch Robert J.
Noland Thomas P.
Olsen James M.
Sliwka Melvin J.
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