Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
A COMPARATIVE EVALUATION OF A SUITABLE CONSTITUTIVE MODEL FOR THERMOPLASTICS WITH ONE BASED ON THE VON MISES CRITERION
Submission Author:
Gabriel Ramos Ferreira , SP , Brazil
Co-Authors:
Gabriel Ramos Ferreira, Paulo de Souza Silva, Luciano Santos da Silva, Gimaezio Gomes Carvalho, Ronei Santos Maciel, Egidio Veronese Junior
Presenter: Gabriel Ramos Ferreira
doi://10.26678/ABCM.COBEM2023.COB2023-0278
Abstract
Thermoplastics have characteristics that differentiate them from metals, becoming challenging to simulate their structural behavior. Besides, literature demonstrates the elastoplastic model based on von Mises criterion is not suitable to represent the polymers behavior. Therefore, for structural simulations involving thermoplastics, a proper selection of the constitutive model is required to obtain reliable results. Thus, this work aims to evaluate constitutive models available in LS-DYNA® solver, through the correlation with physical tests. The methodology is divided into three stages. First stage concerns the data treatment and fitting, obtained from standardized tests of tensile and compression, carried out with polypropylene specimens. These data are inputs of the assessed constitutive models: Piecewise Linear Plasticity and Semi-Analytical Model for Polymers (SAMP-1). A SAMP-1 derivation was also studied by activating the damage curve. The second step consists in running finite element analyses for each constitutive model and verifying which one best correlates with the following physical tests: Tensile, Compression, Three-Point Bending and Erichsen. Finally, the Normalized Root Mean Square Error was used to determine the best constitutive model. In conclusion, the results indicated the SAMP-1 predictions are more assertive than those from Piecewise Linear Plasticity, the one based on von Mises criterion.
Keywords
Thermoplastic, constitutive model, Finite Element Method, Numerical simulation, standardized test
