School of Engineering and Digital Sciences

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https://testres.nu.edu.kz/handle/123456789/79
Nazarbayev University School of Engineering and Digital Sciences aims to be the leading school of engineering in Kazakhstan as well as in the Central Asian region. The School’s objective is to ensure that its graduates are well-prepared to meet the growing demand for flexible professional practitioners in the fields of chemical, mechanical, civil and electrical engineering, to work as the good inventors, scientists, managers and advisers. Please have a look at the School of Engineering and Digital Sciences website.

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Browsing School of Engineering and Digital Sciences by Subject "3D Printing"

Now showing 1 - 3 of 3
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    MODELING AND SIMULATION OF COMPOSITE MATERIALS FOR SLS-BASED 3D PRINTING
    (MANUFACTURING TECHNOLOGY, 2020) Ali, Md Hazrat; Yerbolat, Gaziz; Abilgaziyev, Anuar
    This paper discusses the modeling and simulation results of a new multi-material for a cost-effective Selective Laser Sintering (SLS)-based 3D printer. As this technology utilizes several materials, the me chanical property analysis of multi-materials is crucial for manufacturing an object with the desired phys ical characteristics. Firstly, the development of a database of the SLS 3D printing materials is accom plished, and based on the mechanical properties of materials, this optimization technique is proposed. Secondly, enhancement of physical property by stiffeners is considered and based on the stiffening tech nology, and an alternative optimization method proposed. Finally, two different material minimization methods are discussed in this research. The first method is based on the embedded materials with desired mechanical properties for enhancing the mechanical properties of the printed objects, which are twice optimized by this method with increased material saving. The second method is designed to use stiffen ers to improve the stiffness characteristics of the materials, and then, perform material optimization. This method is effective with more suitability to complex composite geometries. Thus, the methods help to reduce materials used as well as the production cost in 3D printing technology
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    MODELING OF A NEW COUPLER CRITICAL DIMENSIONS (CCD) FOR MOBILITY ANALYSIS
    (MANUFACTURING TECHNOLOGY, 2021-06) Ali, Md Hazrat; Mir-Nasiri, Nazim; Namazov, Manafaddin; Mirzayev, Husseyn; Tanveer, M. Hassan
    A new Coupler Critical Dimensions (CCD) approach to define mobility criteria (crank, rocker conditions, or existence) for linkage mechanisms has been presented in this paper. The concept is critical to design and analyze the extreme lengths of a mechanism coupler link when the mechanism is at the extreme of its existence or changing its mobility condition. The method leads a set of expressions of the constant mechanism parameters that can define the mechanism's coupler link's exact dimensional limits. These expressions present sufficient and necessary dimensional conditions for the mechanism's existence and become a turning point to change mobility from a crank to a rocker and vice versa. The mechanism reaches its change-point configuration at the boundaries of the coupler dimensions. The mechanism may switch from one work function to another or from existence to non-existence. The method has been successfully applied to the planar 4R, spatial RSSR, and planar multiloop linkage mechanisms. The obtained results prove the effectiveness and accuracy of the method in defining the limits of the mechanism rotatability conditions or existence in general. The crank condition is essential to couple it with the motor or engine. If the mechanism input link is not a crank (i.e., it has a possibility of full rotation), the motor may crash the entire mechanism. Rotatabilty of the input link is a fundamental concept in machines and mechanisms.
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    ItemOpen Access
    A NEW COUPLER CRITICAL DIMENSIONS (CCD) METHOD FOR LINKAGE MECHANISMS MOBILITY ANALYSIS
    (J. E. Purkyně University in Ústí nad Labem, 2021-06-07) Ali, Md Hazrat; Mir-Nasiri, Nazim; Namazov, Manafaddin; Mirzayev, Husseyn; Tanveer, M. Hassan
    A new Coupler Critical Dimensions (CCD) approach to define mobility criteria (crank, rocker conditions, or existence) for linkage mechanisms has been presented in this paper. The concept is critical to design and analyze the extreme lengths of a mechanism coupler link when the mechanism is at the extreme of its existence or changing its mobility condition. The method leads a set of expressions of the constant mechanism parameters that can define the mechanism's coupler link's exact dimensional limits. These expressions present sufficient and necessary dimensional conditions for the mechanism's existence and become a turning point to change mobility from a crank to a rocker and vice versa. The mechanism reaches its change-point configuration at the boundaries of the coupler dimensions. The mechanism may switch from one work function to another or from existence to non-existence. The method has been successfully applied to the planar 4R, spatial RSSR, and planar multiloop linkage mechanisms. The obtained results prove the effectiveness and accuracy of the method in defining the limits of the mechanism rotatability conditions or existence in general. The crank condition is essential to couple it with the motor or engine. If the mechanism input link is not a crank (i.e., it has a possibility of full rotation), the motor may crash the entire mechanism. Rotatabilty of the input link is a fundamental concept in machines and mechanisms. Keywords: Additive Manufacturing, 3D Printing, Composite Materials, Material Properties