Experimental and Numerical Study of Energy Absorption in Thin-Walled, Double-Layer Tubes with a Trapezoidal Metal Core

نوع: Type: Thesis

مقطع: Segment: masters

عنوان: Title: Experimental and Numerical Study of Energy Absorption in Thin-Walled, Double-Layer Tubes with a Trapezoidal Metal Core

ارائه دهنده: Provider: Mehdy Zoharyan

اساتید راهنما: Supervisors: Dr Hashem Mazaheri

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr Mehdy Shaban , Dr.Ali alavinia

زمان و تاریخ ارائه: Time and date of presentation: 2025

مکان ارائه: Place of presentation: 55

چکیده: Abstract: The subject of this research concerns thin-walled energy absorbers with a trapezoidal core. Initially, the structures were designed in terms of manufacturability using SolidWorks software, and three structures—namely a quadrilateral structure with a trapezoidal core (4ZB2), a hexagonal structure with a trapezoidal core (6ZB2), and an octagonal structure with a trapezoidal core (8ZB2)—were fabricated using AA1200 aluminum sheets. To enhance plasticity and prevent sheet tearing during the crushing process, a full heat-treatment process was applied to the specimens. In addition, a manual bending device was fabricated for sheet bending, and argon welding was employed to join the sheets after bending. Subsequently, the fabricated specimens were subjected to quasi-static compression tests until complete crushing occurred, and numerical simulations were performed using Abaqus software. The numerical and experimental results obtained from this process were analyzed and compared. In this study, the effects of outer layer thickness, core thickness, inner layer thickness, the ratio of the inner layer side length to the outer layer side length, and the ratio of the smaller side of the core web to the inner layer side length on the specific energy absorption were investigated through optimization for all three energy absorbers. Overall, three specimens with five different parameters were selected with the aim of reducing manufacturing cost while achieving high energy absorption