Page 91 - tech fest 2025 אשדוד חוברת תקצירים

Application of Foldable and Shape-Shifting Material Principles through an External Trigger in 3D Printing
ME-B-13
Liem Livne; lliemdahan@gmail.com Miriam Ben Mordechay; miriabe1@ac.sce.ac.il
Advisor: Dr. Avihai Shurin
SCE - Shamoon College of Engineering, Ashdod
This study investigates the tensile strength and elastic modulus of 3D-printed ‘polylactic acid’ (PLA) with shape memory properties, produced via ‘fused deposition modeling’ (FDM), under repeated heat-induced folding cycles. Our goal is to understand how thermal activation affects PLA’s mechanical performance. Preliminary tests defined key parameters, such as wall thickness, stretching speed, and tensile orientation, to ensure consistency. A controlled heating and folding process was developed to standardize activation. The main experimental phase includes multiple thermal folding cycles followed by tensile testing to assess changes in mechanical behavior. A control group, exposed only to heat without folding, isolates the effects of deformation. This research evaluates how repeated activation influences PLA’s mechanical response over time, providing insight into its long-term performance.
Keywords: 3D printing, 4D printing, elastic modulus, FDM, PLA, shape memory polymers (SMP), tensile strength
Shrapnel Protection System for Wheelchair Users During Missile Attacks
ME-B-14
Hagay Avizrat; hagayaviz98@gmail.com Shai Almasi; shal800081@gmail.com
Advisor: Dr. Avihai Shurin
SCE - Shamoon College of Engineering, Ashdod
This project focuses on developing a protection system integrated into an electric wheelchair for individuals with mobility impairments during missile attacks, especially in scenarios where secure shelter cannot be reached in time, due to limited mobility and time constraints. Market and literature surveys revealed no existing solutions for independent, user-operated shrapnel protection, emphasizing the urgent need for such an innovation. Our system features a lightweight aluminum frame and Kevlar KM2 Plus fabric, providing shielding against high-velocity shrapnel within a five- meter radius of impact. It is designed for fast, reliable deployment without affecting user mobility or comfort. Structural calculations guided both the system design and motor selection, following the evaluation of various deployment mechanisms.
Keywords: accessibility, Kevlar shielding, shrapnel protection, wheelchair-integrated system
Book of Abstracts | 2025
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