Abstract
A mechanical system is described which can stretch a sheet of solid propellant in two directions as a function of time. The sheet displacements along each of the two directions are independently controlled from a computer tape. Two load cells record the instantaneous resulting loads. Biaxial strains are measured by means of a 70-mm camera, which also is operated by the tape. The instrument is designed to stretch a 10-cm square by 0.25-cm-thick sheet to 50-percent strains at cross-head rates from quasi-static to 150 cm/min.
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