Abstract
A device capable of measuring the hydrostatic compliance of solids at pressures below 2000 psi is described. A cylindrical specimen enclosed in a pressure tube is hydrostatically compressed in a fluid. Axial compliance is dynamically recorded as a function of hydrostatic pressure. A differential-transformer deflection transducer detects the change in length of the specimen in conjunction with standard strain-gage pressure transducers measuring hydrostatic stress. Stress-strain curves are produced with suitable recording equipment. These are analyzed using other thermal and mechanical properties of the test material to obtain the bulk modulus, Poisson's ratio in pure compression, and the relation between the adiabatic and isothermal bulk moduli for polymers. Previous related work1–3 on the effect of pressure on mechanical properties of rubbers and filled polymers is summarized and new data presented. Emphasis is given to the uniaxial strain method for measuring the hydrostatic compressibility.
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