Analysis and optimization of 2D missing rib auxetics

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Analysis and optimization of 2D missing rib auxetics

ارائه دهنده: Provider: Kimia Ghasemian

اساتید راهنما: Supervisors: Dr. Mehdi Shaban

اساتید مشاور: Advisory Professors: Dr. Hashem Mazaheri

اساتید ممتحن یا داور: Examining professors or referees: Dr.Ali Alavi Nia -Dr.Rahman Seifi

زمان و تاریخ ارائه: Time and date of presentation: 2024

مکان ارائه: Place of presentation: 62

چکیده: Abstract: Metamaterials are materials that are primarily engineered to achieve specific properties. These materials generally possess characteristics that are unattainable or at least unusual in natural or traditional materials. The most studied properties in structural metamaterials include negative Poisson’s ratio, negative thermal expansion coefficient, and negative linear compressibility. Metamaterials exhibit superior and uncommon properties, including Young's modulus, density, energy absorption, acoustics, heat transfer, smart materials, and negative Poisson's ratio. Auxetic materials, a type of metamaterial, have a negative Poisson’s ratio. Metamaterials were initially used mainly for optical, electromagnetic, and electronic applications, but recent advancements in structural metamaterials have drawn researchers' attention to their mechanical/thermomechanical behavior. Many auxetic materials have a cellular structure, which determines their overall properties. The main objective of this thesis is to investigate the geometric parameters and optimize them for tensile and compressive load-bearing capacities. Auxetic cores with missing ribs are examined using Hitler and spline geometry. In the compression test, the energy absorption and specific energy absorption were evaluated based on two different criteria. It should be noted that in the tensile test samples, the peak force and the corresponding displacement were also examined.

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