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(a) Simplified loading conditions for polymer pellet; (b) Simplified viscoelastic heating model in ultrasonic plasticizing; (c) Typical stress–strain curve of polymer material in a vibration cycle [20]; (d,e) Stress–strain curves obtained from the cyclic compression tests of three cylindrical specimens (SP1, SP2, and SP3) of PP. The tests were performed by the Janer et al. with different processing conditions [155].
