Thermal measuring and testing – Thermal testing of a nonthermal quantity – With loading of specimen
Patent
1980-12-30
1983-01-11
Goldstein, Herbert
Thermal measuring and testing
Thermal testing of a nonthermal quantity
With loading of specimen
73835, G01N 324, G01N 318
Patent
active
043679617
ABSTRACT:
An apparatus for measuring the tear strength of an elastomer specimen having a housing which contains therein a specimen holder, a controllable heat source, a force applying assembly which includes a taut wire, means for measuring the amount of movement of the force applying assembly and a temperature programmer and strip chart recorder. The force applying assembly by means of the taut wire applies a predetermined amount of force on the elastomer specimen which has been precut on one side thereof. The load on the taut wire is counterbalanced by a calibrated spring such that the load decreases linearly to zero as the tearing of the specimen is completed. The result of the tearing is displayed and shows the transition of the elastomer from glass to rubber, the modulus before tearing, the progression of tearing versus increasing temperature, and the strength of the elastomer at elevated temperatures.
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Gent. A. N. et al., "Tear Strength of Stetched Rubber," Rubber Chemistry and Technology, vol. 51, pp. 35-44.
PPT Tear Tester, Testing Machines, Inc., Mineola, N.Y.
Erlich Jacob N.
Goldstein Herbert
Singer Donald J.
The United States of America as represented by the Secretary of
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