Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
STRESSES MEASUREMENTS IN SIMPLE SHEAR TEST FOR A POLYMER UNDER LARGE DEFORMATIONS
Submission Author:
Fernando Araújo , RJ
Co-Authors:
Fernando Araújo, Carolina Seixas Moreira, Osvaldo Luiz de Moura Filho, Nathan Brilhante, Luiz Nunes
Presenter: Fernando Araújo
doi://10.26678/ABCM.COBEM2017.COB17-1799
Abstract
Simple shear apparatus (SSA) is proposed to measure the normal stress component of a thin sheet of solid polymer at large deformations. Displacement fields of the test specimen were estimated by the Digital Image Correlation (DIC) method. The measured forces and the displacement were used to evaluate the shear stress, normal stresses and the amount of shear. Hence, a nonlinear stress-strain response was achieved. The measured normal stress was compared with those calculated from the experimental data by assuming two hypotheses: the first one was based on a plane stress condition, while, on the second, the normal component of the traction on the inclined surfaces was assumed to be zero. Finally, the initial shear modulus of the material was estimated using the Lopez-Pamies strain energy function. The stresses results indicate that there are no agreement between measured values and the ones calculated by both hypotheses. Moreover, the initial shear modulus obtained is accordance with that found in the literature. In addition, the principal advantages of the proposed apparatus shear test are a simple assembly and a wide range of shear strains is achieved.
Keywords
Large deformation, polymer, DIC, Simple shear apparatus, Stresses components
