The response of plastics to stress when deformed by contact with hard objects under load is important in such diverse applications as bearings, guides, and phonograph records. A study of the permanent deformation of Plexiglas by spherical indentors under a wide range of load, indentor diameter, and time of loading has shown that a single relationship can be used to relate these and other variables. Preliminary sliding experiments at extremely low speeds (ca. 10/-5 cm/sec) indicate that the relationship derived for static indentations can be used to predict the permanent deformation to be expected in sliding under conditions of diverse loads and speeds. A particularly valuable application is that of predicting the deformation properties of proposed phonograph record systems by comparison with the known properties of existing systems.
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