Anisotropic loss of toughness with physical aging of work toughened polycarbonate |
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| Authors: | Kyle Strabala Shawn Meagher Charles Landais Laurent Delbreilh Mehrdad Negahban Jean‐Marc Saiter Joseph Turner Adam Ingram Roman Golovchak |
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| Affiliation: | 1. AMME‐ATEAM, Mechanical and Materials Engineering, University of Nebraska‐Lincoln, , Lincoln, Nebraska, 68588‐0526;2. AMME‐LECAP, Institut des Matériaux de Rouen, Université de Rouen, , 76801 Saint Etienne du Rouvray, France;3. Department of Physics of Opole University of Technology, , 45370 Opole, Poland;4. Department of Materials Science and Engineering, Lehigh University, , Bethlehem, Pennsylvania, 18015‐3195 |
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| Abstract: | We have studied the response of mechanically toughened and physically aged polycarbonate primarily using Charpy impact and ultrasonic wave speed measurements. The toughening was conducted through plastic compression on as‐received PC. The Charpy impact tests showed anisotropic toughening, both in the absorbed energy and in the mode of fracture. The amount of toughening with plastic compression, even though anisotropic, is centered around the response of annealed and quenched samples, which represent the response of an unaged PC. There was an anisotropic drop in the toughness of some samples with aging. The time of this drop was uncorrelated in the different directions and disappeared for the highly toughened samples. This transition was bimodal and statistically distributed between either a fully ductile or a fully brittle failure. As the samples were prepared in a manner to remove induced residual stresses, this drop in toughening may be associated with an intrinsic anisotropic thermal aging of the deformed material. POLYM. ENG. SCI., 54:794–804, 2014. © 2013 Society of Plastics Engineers |
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