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The effect of specimen geometry and lateral constraint on the isothermal compressibility of low-strength polymeric materials

Results indicate that test-specimen geometry and constraint friction are important factors in determining the accuracy of isothermal hydrostats of materials that have been determined from laterally constrained compression tests

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Abstract

Significant errors can be present in the isothermal pressure-volume relationships that have been obtained from laterally constrained compression tests of low-strength polymeric materials. Laterally constrained compression tests on PMMA (polymethylmethacrylate) have shown these errors to result from (1) stress gradients in the specimen caused by constraint friction and (2) unknown volume changes resulting from extrusion of the test specimen. Test-specimen geometry was an important parameter.

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Authors and Affiliations

  1. Kinetic Behavior of Materials Division, Sandia Laboratories, 87115, Albuquerque, N. M.

    O. L. Burchett (Supervisor)

  2. School of Aerospace, Mechanical and Nuclear Engineering, University of Oklahoma, 73069, Norman, Okla.

    C. W. Bert (Professor)

Authors
  1. O. L. Burchett
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  2. C. W. Bert
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Additional information

This research was supported by the U. S. Atomic Energy Commission and is based on part of a dissertation submitted by the first author in partial fulfillment of the requirements for the degree of Doctor of Engineering at the University of Oklahoma. The first author also acknowledges financial support provided by the Sandia Laboratories Doctoral Study Program.

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Burchett, O.L., Bert, C.W. The effect of specimen geometry and lateral constraint on the isothermal compressibility of low-strength polymeric materials. Experimental Mechanics 12, 328–331 (1972). https://doi.org/10.1007/BF02320489

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