An alternative explanation of forming force reduction for forming process submitted to vibration: Influence of the waveform in the viscoplastic domain
Article dans une revue avec comité de lecture
This article addresses the effects of vibrations on a viscoplastic workpiece applied during the forgingprocess. To achieve this goal, a phenomenological model based on the slice method combined with aNorton–Hoff viscoplastic law is developed. It allows to study the impact of vibration on the reductionof the mean forging load which has been experimentally observed before, and demonstrates that thesensitivity to strain rate is a key parameter. Moreover, based on the model, a new waveform of thevibrations is proposed that enhance the mean forging load reduction. Finite element simulations andexperiments have been performed to evaluate the validity of the model in the case of sinusoidal andtriangular waveforms, and are in good agreement with the analytical model’s predictions.
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Effects of Vibrations on Metal Forming Process: Analytical Approach and Finite Element Simulations Communication avec acteKHAN, Armaghan; GIRAUD-AUDINE, Christophe; ABBA, Gabriel; BIGOT, Régis (American Institute of Physics, 2011)Vibration assisted forming is one of the most recent and beneficial technique used to improve forming process. Effects of vibration on metal forming processes can be attributed to two causes. First, the volume effect links ...
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Article dans une revue avec comité de lectureKHAN, Armaghan; NGUYEN, Thanh Hung; GIRAUD-AUDINE, Christophe; ABBA, Gabriel; BIGOT, Régis; LEMAIRE-SEMAIL, Betty (EDP Sciences, 2014)Application of vibration in metal forming process has already shown numerous advantages in the past. It improves not only mechanical and surface properties of workpiece but the integration of vibration in metal forming ...
Modelling of forging processes assisted by piezoelectric actuators : principles and experimental validation Article dans une revue avec comité de lectureGIRAUD-AUDINE, Christophe; NGUYEN, Thanh Hung; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; BIGOT, Régis (Institute of Electrical and Electronics Engineers, 2014)This paper presents the modelling of a forging processes assisted by a piezoelectric actuator (PA), which is used to generate specific low frequency vibration waveforms. Experimental results show that such waveforms reduce ...
Modelling of piezoelectric actuators used in forging processes: principles and experimental validation Communication avec acteNGUYEN, Thanh Hung; GIRAUD-AUDINE, Christophe; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; BIGOT, Régis (IEEE, 2012)This paper deals with the modelling of a piezo- electric stack actuator used to generate specific low frequency vibration waveforms to assist forging processes. Experimental results show that such waveforms reduce the ...