Investigating the Strain Rate Sensitivity and Mechanical Behavior of Photopolymer Base Cellular Structures: Focus on Base Material and Cell-Graded Gyroid Structures

Date

2023-09-21

Author

Yılmaz, Yunus Emre
Novak, Nejc
Yaman, Ulaş
Ren, Zoran

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This study aims to enhance the understanding of the mechanical behavior of cellularstructures, with a particular focus on the strain rate sensitivity of the base material. Cellularstructures are known for their exceptional mechanical properties, presenting challenges incomprehending their complex behavior influenced by factors such as strain rate sensitivity, inertia,and morphology. To address these challenges, a comprehensive investigation combiningexperimental and computational approaches was conducted. Experimental analysis revealed acritical strain rate range, indicating that the material displayed ductile behavior below 0.8 s-1,transitioning to a highly brittle state above 1.67 s-1. Furthermore, the onset of brittleness occurred atdeformation rates exceeding this threshold. Computational simulations and experimental analysisdemonstrated that the response of the base material was predominantly governed by its strain ratedependency rather than inertial effects. In addition to investigating the behavior of the base material,the study also explored the mechanical characteristics of cell-grade gyroid structures. These uniquestructures exhibited distinct properties attributed to their porous morphology, specifically their "longplateau" configuration. Remarkably, the structures demonstrated a hardening effect when subjectedto rapid deformations. This observed hardening phenomenon can be attributed to the strain ratesensitivity of the base material, highlighting its significant role in shaping the overall mechanicalbehavior.

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http://www.drustvozamehaniko.si/zbornik/ZbornikKD2023.pdf
https://hdl.handle.net/11511/112431

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Department of Mechanical Engineering, Conference / Seminar