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1. Thermoplastics: a wealth of mechanical behaviors
1.1 General description
A simple way to illustrate the range of behaviors available to plastics is to observe the effect of temperature on mechanical stress. Consider the multiaxial impact test (dart test), which involves impacting an embedded plate around its entire circumference with a hemispherical impactor. At the end of the impact, the impactor is removed immediately before the specimen is cooled, in order to highlight the springback mechanism at the end of the test at test temperature. The result of the experiment is an evolution of the impact force as a function of time and, of course, the fracture surface. Figure 1 is an example of results obtained...
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Thermoplastics: a wealth of mechanical behaviors
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The Ultimate Scientific and Technical Reference