Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
ASSESSMENT OF CORRELATION BETWEEN SIMULATIONS AND STANDARDIZED TESTS OF THERMOPLASTICS FROM DIFFERENT TRUE STRESS-STRAIN EQUATIONS
Submission Author:
Paulo de Souza Silva , SP , Brazil
Co-Authors:
Paulo de Souza Silva, Gabriel Ramos Ferreira, Luciano Santos da Silva, Gimaezio Gomes Carvalho, Ronei Santos Maciel, Egidio Veronese Junior
Presenter: Gabriel Ramos Ferreira
doi://10.26678/ABCM.COBEM2023.COB2023-0276
Abstract
The literature demonstrates von Mises model is not suitable for ductile thermoplastics. In addition, some Finite Element solvers still lack constitutive models that accurately simulate the thermoplastics behavior. However, it is known there are different formulations to estimate true stress. Thus, this study aims to evaluate the correlation between numerical simulations and standardized tests by comparing results from different true stress formulations. It also proposes a combination of these formulations, using the von Mises constitutive model available in ABAQUS® solver. The physical tests were carried out with Polypropylene specimens. The methodology was divided into three stages, the first relating to the data treatment, being the data acquired from standardized tensile tests and the combination of true stress formulations performed by parameters calibration. Then, finite element analyses were run for the following four tests: Tensile, Compression, Three-Point Bending, and Erichsen. Finally, an evaluation was done to determine which model fits better, considering the Normalized Root Mean Square Error as main metric. In conclusion, it is inferred that the combination of the true stress equations ISO 18872 and DuBois’ showed better correlation than the others for this selected material, even though using the von Mises Classical Metal Plasticity constitutive model available.
Keywords
Thermoplastic, true stress-strain, structural simulations, standardized test
