Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 54 10 2022 12 22 Presenting the Traction-Separation Law for Ultrasonic Welding of Glass-Fiber Reinforced Polypropylene Composite Presenting the Traction-Separation Law for Ultrasonic Welding of Glass-Fiber Reinforced Polypropylene Composite 2429 2456 4942 10.22060/mej.2022.20581.7261 FA Reza Ahmadi Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran Hasan Biglari Department of Mechanical Engineering, University of Tabriz Journal Article 2021 09 21 The generalized progressive damage model is numerically and experimentally studied to predict the degradation process in end notch flexure composite specimens welded by the ultrasonic method. In numerical modeling, a trapezoidal traction-separation model that expresses the embedded process zone is developed using three data reduction methods of the compliance calibration method, classical beam theory, and compliance-based beam method, and formulated by combining failure and damage mechanics. Finally, the force-displacement diagrams obtained from experimental investigations and the force-displacement diagrams extracted from numerical modeling are compared. The results demonstrate that the models extracted using the compliance-based beam method and classical beam theory method make accurate predictions compared to the compliance calibration method. The generalized progressive damage model is numerically and experimentally studied to predict the degradation process in end notch flexure composite specimens welded by the ultrasonic method. In numerical modeling, a trapezoidal traction-separation model that expresses the embedded process zone is developed using three data reduction methods of the compliance calibration method, classical beam theory, and compliance-based beam method, and formulated by combining failure and damage mechanics. Finally, the force-displacement diagrams obtained from experimental investigations and the force-displacement diagrams extracted from numerical modeling are compared. The results demonstrate that the models extracted using the compliance-based beam method and classical beam theory method make accurate predictions compared to the compliance calibration method. https://mej.aut.ac.ir/article_4942_31bd51a7403b980bf1039518120712e0.pdf