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Browsing Articles by Subject "3D printing"

Now showing 1 - 5 of 5
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    A CRITICAL REVIEW OF 3D PRINTING AND DIGITAL MANUFACTURING IN CONSTRUCTION ENGINEERING
    (Rapid Prototyping Journal, 2022) Ali, Md. Hazrat; Issayev, Gani; Shehab, Essam; Sharfraz, Shoaib
    Purpose In recent years, 3D printing technologies have been widely used in the construction industry. 3D printing in construction is very attractive because of its capability of process automation and the possibility of saving labor, waste materials, construction time and hazardous procedures for humans. Significant researches were conducted to identify the performance of the materials, while some researches focused on the development of novel techniques and methods, such as building information modeling. This paper aims to provide a detailed overview of the state-of-the-art of currently used 3D printing technologies in the construction areas and global acceptance in its applications. Design/methodology/approach The working principle of additive manufacturing in construction engineering (CE) is presented in terms of structural design, materials used and theoretical background of the leading technologies that are used to construct buildings and structures as well as their distinctive features. Findings The trends of 3D printing processes in CE are very promising, as well as the development of novel materials, will gain further momentum. The findings also indicate that the digital twin (DT) in construction technology would bring the industry a step forward toward achieving the goal of Industry 5.0. Originality/value This review highlights the prospects of digital manufacturing and the DT in construction engineering. It also indicates the future research direction of 3D printing in various constriction sectors.
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    DEVELOPMENT OF A LARGE-SCALE MULTI-EXTRUSION FDM PRINTER, AND ITS CHALLENGES
    (International Journal of Lightweight Materials and Manufacture, 2022) Ali, Md. Hazrat; Kurokawa, Syuhei; Shehab, Essam; Mukhtarkhanov, Muslim
    This study focuses on the development of a large-dimensional 3D printer and its challenges in general. The major fused deposition modeling (FDM) printers focus on printing small-scale parts due to their challenges in printing large-scale objects using thermoplastic polymer filaments. A novel largedimensional multi-extrusion FDM printer is developed at the workshop and printed several largedimensional objects to emphasize its prospects in developing large-scale products. The printer has a print bed with a dimension of 900 mm 1100 mm 770 mm with respect to the lengthewidtheheight (LeWeH), respectively. There are many challenges to successfully printing large-dimensional objects using FDM technology. The experimental design elaborates on the challenges experienced during printing various large-dimensional objects. In addition, the paper focuses on the qualitative analysis of the optimal process parameters in section 4.5. Based on the experimental results, the key challenges are found to be uneven bed temperature, bending of print bed due to thermal effect, surface unsticks due to lack of adhesive force, surrounding temperature, and irregular filament feed. Experimental results also validate the key design specifications and their impact on enhancing large-scale 3D printing. The developed printer is capable of printing large-scale objects with five different thermoplastic materials using five individual extruders simultaneously. It adds a new dimension of flexible automation in additive manufacturing (AM)
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    FINITE ELEMENT ANALYSIS OF THE CFRP-BASED 3D PRINTED ANKLE-FOOT ORTHOSIS
    (Procedia Computer Science, 2021) Ali, Md. Hazrat; Smagulov, Zhalgas; Otepbergenov, Temirlan
    The application of the 3D printing and additive manufacturing in making medical devices have become widespread in the last decades as the opportunity of the technology is rapidly growing. Notably, the Fused Deposition Modeling (FDM) in 3D printing technique has been applied to develop the ankle-foot orthosis (AFO) with different materials and composites. This paper presents a new design and simulation results of a novel orthosis using Carbon Fiber Reinforced Polymer (CFRP). The orthosis for ankle foot is designed for rehabilitation of the patient from the foot drop disease. The orthosis’ shape is modelled to support the backside of the calf. It contributes to the maintenance of the gait cycle. In this paper, two different models of the AFO are compared, namely articulated and non-articulated. The finite-element analysis is done using the ANSYS software, and the results for equivalent Von Mises stress as well as total deformation are observed and analyzed. Various materials are applied during the numerical analysis, as well as their combinations are tested
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    FINITE ELEMENT ANALYSIS OF THE CFRP-BASED 3D PRINTED ANKLE-FOOT ORTHOSIS
    (Procedia Computer Science, 2021) HazratAli, Md.; Otepbergenov, Temirlan; Smagulov, Zhalgas
    The application of the 3D printing and additive manufacturing in making medical devices have become widespread in the last decades as the opportunity of the technology is rapidly growing. Notably, the Fused Deposition Modeling (FDM) in 3D printing technique has been applied to develop the ankle-foot orthosis (AFO) with different materials and composites. This paper presents a new design and simulation results of a novel orthosis using Carbon Fiber Reinforced Polymer (CFRP). The orthosis for ankle-foot is designed for rehabilitation of the patient from the foot drop disease. The orthosis’ shape is modelled to support the backside of the calf. It contributes to the maintenance of the gait cycle. In this paper, two different models of the AFO are compared, namely articulated and non-articulated. The finite-element analysis is done using the ANSYS software, and the results for equivalent Von-Mises stress as well as total deformation are observed and analyzed. Various materials are applied during the numerical analysis, as well as their combinations are tested.
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    A REVIEW OF RECENT DEVELOPMENTS AND ADVANCES IN ECO-FRIENDLY GEOPOLYMER CONCRETE
    (MDPI, 2020-11-05) Imtiaz, Lahiba; Rehman, Sardar Kashif Ur; Ali Memon, Shazim; Khizar Khan, Muhammad; Faisal Javed, Muhammad
    The emission of CO2 and energy requirement in the production of Ordinary Portland Cement (OPC) causes the continuous depletion of ozone layer and global warming. The introduction of geopolymer concrete (GPC) technology in the construction industry leads to sustainable development and cleaner environment by reducing environmental pollution. In this article, constituents of GPC and their influence on properties of GPC has been reviewed critically. Fresh and hardened properties of GPC as well as the factors influencing these properties are discussed in detail. Flow charts have been proposed to show which factors have higher/lower impact on the fresh and hardened properties of GPC. A comprehensive review on the mix design of GPC, nanomaterial-based GPC, 3D printing using GPC, reinforced GPC and Global warming potential (GWP) assessment was conducted. Finally, the practical applications of GPC in the construction industry are provided. View Full-Text Keywords: aluminosilicates; activators geopolymer concrete (GPC); geopolymer OPC concrete; Global warming potential (GWP); mix design; reinforced geopolymer concrete; graphene-based GPC; 3D printing