Experimental and Numerical Studies on Behavior of a 3D double-arrow-head auxetic structure under quasi-static compressive loads

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Experimental and Numerical Studies on Behavior of a 3D double-arrow-head auxetic structure under quasi-static compressive loads

ارائه دهنده: Provider: mohamadreza khorami

اساتید راهنما: Supervisors: Dr hashem mazaheri

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr mahdi karimi - Dr mahdi shaban

زمان و تاریخ ارائه: Time and date of presentation: 2022

مکان ارائه: Place of presentation: Online

چکیده: Abstract: Auxetic materials and their various structures are used in various fields such as protective equipment, connections, bullet-proof vests, medical fields, sports applications, textile goods and nuclear reactors. Also, one of its most important applications is energy absorption. Metal auxetic structures have attracted a lot of attention in recent years. An important feature of these structures is the high plastic deformation, which can be a factor in absorbing energy when colliding with other objects. Due to the demand for explosion-proof coatings and energy-dissipating materials and lightweight structures with very high energy absorption capacity, in this study, a 3D double arrow-head auxetic structure consisting of trapezoidal corrugated strips in 4 floors with 9number of unit cells in each floor is made of 3105 aluminium in dense diagonal shape. It is then subjected to quasi-static compressive loading at a speed of 2 mm / min and the results are compared with a numerical model based on the finite element method by Abaqus software and validated with 4% accuracy. A parametric study was performed to optimize the amount of specific energy absorption capacity. In this study, by fixing the mass of the structures and changing the design variables, the specific energy absorption was calculated and the optimal model was determined. For an increase in thickness of 0.1mm and 0.2mm increases by an average of 88% and 275%, respectively. Also, for an increase in the width of corrugated strips by 1 and 2 mm, the amount of specific energy absorption increases by an average of 40% and 95%, respectively. Variables such as the span and the amplitude of the wave have the inverse and direct relation of the specific energy absorption, respectively

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