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  • Open Access


    Damping Analysis and Failure Mechanism of 3D Printed Bio-Based Sandwich with Auxetic Core under Bending Fatigue Loading

    Khawla Essassi1,2,*, Jean-Luc Rebiere1, Abderrahim El Mahi1, Mohamed Amine Ben Souf2, Anas Bouguecha2, Mohamed Haddar2

    Journal of Renewable Materials, Vol.9, No.3, pp. 569-584, 2021, DOI:10.32604/jrm.2021.012253

    Abstract Meta-sandwich composites with three-dimensional (3D) printed architecture structure are characterized by their high ability to absorb energy. In this paper, static and fatigue 3-point bending tests are implemented on a 3D printed sandwich composites with a re-entrant honeycomb core. The skins, core and whole sandwich are manufactured using the same bio-based material which is polylactic acid with flax fiber reinforcement. Experimental tests are performed in order to evaluate the durability and the ability of this material to dissipate energy. First, static tests are conducted to study the bending behaviour of the sandwich beams, as well as to determine the failure… More >

  • Open Access


    3D Printing of Polylactic Acid Bioplastic–Carbon Fibres and Twisted Kevlar Composites Through Coextrusion Using Fused Deposition Modeling

    J. Y. Tey*, W. H. Yeo, Y. J. King, W. O. Ding

    Journal of Renewable Materials, Vol.8, No.12, pp. 1671-1680, 2020, DOI:10.32604/jrm.2020.011870

    Abstract Polylactic acid (PLA) bioplastic is a common material used in Fused Deposition Modeling (FDM) 3D printing. It is biodegradable and environmentally friendly biopolymer which made out of corn. However, it exhibits weak mechanical properties which reduced its usability as a functional prototype in a real-world application. In the present study, two PLA composites are created through coextruded with 3K carbon fibres and twisted Kevlar string (as core fibre) to form a fibre reinforced parts (FRP). The mechanical strength of printed parts was examined using ASTM D638 standard with a strain rate of 1 mm/min. It has been demonstrated that the… More >

  • Open Access


    A New Finite Element Model with Manufactured Error for Additive Manufacturing

    Zhaohui Xia1,2, Zhihao He2, Qifu Wang1, Yingjun Wang2,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.2, pp. 703-720, 2020, DOI:10.32604/cmes.2020.010368

    Abstract Additive manufacturing (AM), adding materials layer by layer, can be used to produce objects of almost any shape or geometry. However, AM techniques cannot accurately build parts with large overhangs, especially for the large features close to horizontal, hanging over the void. The overhangs will make the manufactured model deviate from the design model, which will result in the performance of the manufactured model that cannot satisfy the design requirements. In this paper, we will propose a new finite element (FE) analysis model that includes the manufacturing errors by mimicking the AM layer by layer construction process. In such FE… More >

  • Open Access


    Use of 3D models of vascular rings and slings to improve resident education

    Trahern W. Jones, Michael D. Seckeler

    Congenital Heart Disease, Vol.12, No.5, pp. 578-582, 2017, DOI:10.1111/chd.12486

    Abstract Objective: Three-dimensional (3D) printing is a manufacturing method by which an object is created in an additive process, and can be used with medical imaging data to generate accurate physical reproductions of organs and tissues for a variety of applications. We hypothesized that using 3D printed models of congenital cardiovascular lesions to supplement an educational lecture would improve learners’ scores on a board-style examination.
    Design and Intervention: Patients with normal and abnormal aortic arches were selected and anonymized to generate 3D printed models. A cohort of pediatric and combined pediatric/emergency medicine residents were then randomized to intervention and control groups.… More >

  • Open Access


    Utility of three‐dimensional models in resident education on simple and complex intracardiac congenital heart defects

    Shelby C. White1, Jennifer Sedler2, Trahern W. Jones3, Michael Seckeler1

    Congenital Heart Disease, Vol.13, No.6, pp. 1045-1049, 2018, DOI:10.1111/chd.12673

    Abstract Objective: Applications of three‐dimensional (3D) printed models in medicine in‐ clude preprocedure planning, patient education, and clinical training. Reproducing complex anatomy as a 3D printed model can be useful for understanding congenital heart defects (CHD). We hypothesized that using 3D printed models during didactic sessions with resident physicians will improve trainees’ understanding of CHD.
    Design and intervention: We performed a prospective, randomized educational in‐ tervention for teaching pediatric and pediatric/emergency medicine residents about simple (ventricular septal defect [VSD]) and moderately complex (tetralogy of Fallot [ToF]) CHD. Residents were divided into two groups: intervention and control. Each group completed a subjective… More >

  • Open Access


    Use of 3D models of congenital heart disease as an education tool for cardiac nurses

    Giovanni Biglino1,2, Claudio Capelli2,3, Despina Koniordou3, Di Robertshaw2, Lindsay-Kay Leaver2, Silvia Schievano2,3, Andrew M. Taylor2,3, Jo Wray2

    Congenital Heart Disease, Vol.12, No.1, pp. 113-118, 2017

    Abstract Background: Nurse education and training are key to providing congenital heart disease (CHD) patients with consistent high standards of care as well as enabling career progression. One approach for improving educational experience is the use of 3D patient-specific models.
    Objectives: To gather pilot data to assess the feasibility of using 3D models of CHD during a training course for cardiac nurses; to evaluate the potential of 3D models in this context, from the nurses’ perspective; and to identify possible improvements to optimise their use for teaching.
    Design: A cross-sectional survey.
    Setting: A national training week for cardiac nurses.
    Participants: One… More >

  • Open Access


    Recent Progress in Medical Biomaterials

    Qiqing Zhang1,2,3,*, Yuan Zhang4, Linzhao Wang4, Yongzhen Xing4

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 134-135, 2019, DOI:10.32604/mcb.2019.07301

    Abstract Guided tissue regeneration (GTR) is a technique that selectively guides cells to attach and proliferate towards an injured site to achieve tissue regeneration through a physical barrier membrane. In this review, we presented a brief overview of the development of GTR technology and GTR materials. Nowadays, new technologies such as electrospinning, nanotechnology, controlled release technique, and 3D printing have been introduced into the study of GTR materials. Resorbable membrane as GTR materials are available as alternatives to conventional non-resorbable membranes. Current GTR materials not only act as a physical barrier membrane but also as a scaffold to play a role… More >

  • Open Access


    Dual 3D Printing Hierarchical Nano/Micro Vascularized Bone Tissue

    Sung Yun Hann1, Haitao Cui1, Timothy Esworthy1, Xuan Zhou1, Se-jun Lee1, Lijie Grace Zhang1,2,3,4,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 76-76, 2019, DOI:10.32604/mcb.2019.07314

    Abstract The vascularization is the most significant to achieve efficient supplement of the nutrients and oxygen for tissue and organ regeneration. However, there is a remaining challenge to fabricate a durable and functional vascularized tissue. Currently, 3D printing has emerged as a promising technique to fabricate vascular networks in many studies due to its superior controllability, reproducibility, and repeatability. In the current study, the main objective is to utilize an advanced dual 3D printing technique including stereolithography (SLA) and fused deposition modeling (FDM) to create a biomimetic bone tissue with perfusable vascular networks. Specifically, the vascularized bone construct was fabricated by… More >

  • Open Access


    Finite Element Analysis of 4D Printing

    Kerlin P. Robert1, Jiaoyan Li2, James D. Lee1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 74-74, 2019, DOI:10.32604/mcb.2019.07125

    Abstract This presentation focuses on the new and upcoming concept of 4D printing and its vast scope and importance in the research and development in industry. The 3D printing object is considered as a layered structure. Each layer may have different orientation. Therefore each layer may behave differently under the change of its environment. We formulate the theoretical shape changing process of 4D printing resulted from (I) the biological growth or swelling, (II) the change of temperature, and (III) the effect of electric field on piezoelectric material of the 3D printing product. Then we illustrate this theory visually through finite element… More >

  • Open Access


    Investigation of 3D Printing Process Via Meshless Analysis and Experiment Technique

    Ying Mao1,*, Ming-Hisao Lee2, Wen-Hwa Chen1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 53-53, 2019, DOI:10.32604/icces.2019.05306

    Abstract 3D printing technology is mainly designed to fabricate irregular-shaped targets, but it undergoes an issue of unavoidable thermal residual stress and may induce serious warping and distortion. To guarantee the quality of the printing 3D irregular-shaped parts, a novel meshless analysis procedure is therefore established in this work. With certain checking mechanisms devised, the nodes used by the meshless analysis are appropriately chosen to represent the irregular geometry of printing parts and fit the growing situation in the printing process. As verified by the temperature measurement in the printing process, uniform temperature of each layer is assumed and the thermal… More >

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