M. A. Sherman
The stress and strain at the onset of crazing of polymethyl methacrylate were determined at 23, 50, and 70 degrees C. The materials tested were commercial cast polymethyl-methacrylate sheets of both general-purpose and heat-resistant grades. Most of the tests were made on samples 0.15 inch thick. Load-elongation graphs were made during the tests and the onset of crazing was observed visually and noted on the graph.
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