Experimental and numerical studies on 3D printed combined auxetic structures using polylactic acid (PLA) filament under quasi-static compression loading

Experimental and numerical studies on 3D printed combined auxetic structures using polylactic acid (PLA) filament under quasi-static compression loading


Experimental and numerical studies on 3D printed combined auxetic structures using polylactic acid (PLA) filament under quasi-static compression loading

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Experimental and numerical studies on 3D printed combined auxetic structures using polylactic acid (PLA) filament under quasi-static compression loading

ارائه دهنده: Provider: Hamidreza Taheri

اساتید راهنما: Supervisors: Dr. Hashem Mazaheri

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr. Ali Alavinia, Dr. Mehdi Shaban

زمان و تاریخ ارائه: Time and date of presentation: 16 مهر 1402 ساعت 16-18

مکان ارائه: Place of presentation: Engineering College-seminar 2

چکیده: Abstract: Auxetic structures, which have a negative Poisson's ratio, have been widely used in various industries in recent years due to their desirable mechanical properties such as impact resistance, high strength, and greater energy absorption capacity than conventional structures. In this research, the standard tensile test samples were subjected to tensile testing using the FDM 3D printer with PLA+ filament to obtain the mechanical properties of the material by employing the SANTAM-STM 50 device. Optimized PLA material is PLA+, that has higher flexibility and greater adhesion of layers. After calculating the mechanical properties of the material, simulation of four uniform two-dimensional structures, including Reentrant, Honeycomb, Chiral, and Arrow head, was performed using the EXPLICIT solver of ABAQUS software. Also, in order to validate the simulation, the structures were made using a 3D FDM printer and their compression test was done with SANTAM-STM 150 device. From the combination of uniform structures, simulation of four hybrid structures including Reentrant-Arrow head (R-A), Reentrant-Chiral structures (R-C) and two different Reentrant-honeycomb structures (R-H-1,R-H-2) were performed at two loading angles of 0 and 90 degrees. Reentrant-honeycomb structure (R-H-2) had the highest amount of specific energy absorption of 2610 J/kg; By conducting the experimental test of this structure, the simulation was validated. The specific energy absorption of the hybrid structure R-H-2 increased by 77% compared to the Reentrant uniform structure. Using the response surface method (RSM), the effect of four dimensional variables on the amount of specific energy absorption was investigated. Finally, the optimal values of the variables to maximize the amount of specific energy absorption were determined and the correctness of the optimization was checked by simulation and experimental testing. The amount of specific energy absorption in the experimental test for the optimized structure increased by 107% compared to the initial structure

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