Akademik Veri Yönetim Sistemi
8. INTERNATIONAL ANTALYA SCIENTIFIC RESEARCH AND INNOVATIVE STUDIES CONGRESS, Antalya, Türkiye, 25 - 27 Ocak 2025, ss.3
Introduction and Purpose: Accurately predicting the response of industrially relevant amorphous polymers, such as Acrylonitrile-Styrene-Acrylate (ASA), under multiaxial loading conditions, such as three-point bending, presents significant challenges due to their distinct yielding behaviors under tension and compression. For satisfactory predictions, the material model employed in finite element analysis must adequately capture these varied behaviors. However, most existing models are complex and necessitate the identification of numerous parameters. Consequently, the objective of this study was to accurately estimate the three-point bending response of ASA with a relatively simple linear Drucker-Prager material model and to propose a clear and systematic approach for determining the model's parameters. Materials and Methods: Tension, compression and three-point bending tests were conducted on ASA specimens fabricated via 3D printing. The plastic stress-strain data obtained from tension and compression tests at the same strain rate were utilized to determine the parameters of the linear Drucker-Prager material model, including the friction angle, dilation angle, and the yield stress ratio. Subsequently, three-point bending simulations were performed in the Abaqus finite element engineering software, incorporating these determined parameters along with plastic stress-strain data from the tensile tests to characterize the material's hardening behavior. For comparative analysis, the three-point bending simulations were also performed based on the von-Mises criterion, which disregards the distinct yielding behaviors of ASA under tension and compression. Results: The simulation results underscored the necessity for material models employed in finite element analysis to account for the distinct material behaviors under compression and tension to accurately predict the three-point bending response of ASA. Discussion and Conclusion: This study revealed that the linear Drucker-Prager model accurately predicts ASA's three-point bending response with minor peak load overestimation, while the von Mises criterion significantly underestimates it, highlighting its limitations.