Article
Engineering, Biomedical
H. M. A. Kolken, A. Fontecha Garcia, A. Du Plessis, A. Meynen, C. Rans, L. Scheys, M. J. Mirzaali, A. A. Zadpoor
Summary: This study investigates the fatigue performance and crack formation mechanism of additively manufactured auxetic meta-biomaterials. Through full-field strain measurement and 3D imaging, the damage evolution during cyclic loading is revealed. Targeting the structural weak spots during the design and printing process is crucial for enhancing the performance of auxetic meta-biomaterials.
ACTA BIOMATERIALIA
(2022)
Article
Materials Science, Composites
Zhixiong Li, Chengshuang Xie, Feng Li, Di Wu, Nan Hu
Summary: This study evaluates the geometric patterns of 3D-printed core lattices embedded in silicone rubber composite units under different loading scenarios, including uniaxial compression, compression-shear load, and loading-unloading cycles. Various geometric patterns exhibit different advantages under certain loading conditions. Heterogeneous geometric patterns are further developed to achieve tailorable and enhanced stiffness under compression and shear load. The developed composite units demonstrate excellent energy absorption under compressive loading-unloading cycles.
COMPOSITES COMMUNICATIONS
(2023)
Review
Mechanics
Swapnil Vyavahare, Vinyas Mahesh, Vishwas Mahesh, Dineshkumar Harursampath
Summary: This paper provides a critical review of 390 research papers published in the last 30 years, focusing on additively manufactured meta-biomaterials. The review classifies the literature into five sections and aims to guide future research in this field. The ultimate goal is to develop sophisticated, patient-specific meta-biomaterials through the suggested research in the shortest time possible.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Niranjan Kumar Choudhry, Biranchi Panda, S. Kumar
Summary: In this study, a pair of novel 2D re-entrant auxetic lattices capable of exhibiting enhanced stiffness and energy absorption is proposed by introducing vertical ligaments into conventional re-entrant structures. The deformation patterns and the energy absorption characteristics of the lattices were investigated via simulations and experiments. The results suggest that the proposed structures exhibit enhanced stiffness and superior energy absorption compared to conventional lattices.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Mechanical
M. Kahlin, H. Ansell, A. Kerwin, B. Smith, J. Moverare
Summary: Different surface post processes were applied to additively manufactured metals, followed by fatigue testing and predictions. The experimental results showed that the post processed materials exhibited an increase in fatigue life of over 5 times.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Jeremy H. Rao, Nikki Stanford
Summary: Research shows that under fully reversed loading conditions, additive manufactured (AM) materials exhibit significantly lower fatigue strengths than wrought materials after approximately 10^5 cycles. Additionally, the fatigue strengths of AM materials are noticeably reduced under high cycle conditions.
Article
Engineering, Manufacturing
Ross Johnston, Zafer Kazanci
Summary: This study compares the effects of different material combinations on the performance of cellular structures, finding that single-material structures perform best in single loading cycle situations, while multi-material structures are suitable for situations requiring multiple loading cycles. Introducing materials with varying stiffnesses into specific regions within the structure can modify the Poisson's ratio during compression, improving overall performance.
ADDITIVE MANUFACTURING
(2021)
Review
Materials Science, Multidisciplinary
Uwe Zerbst, Giovanni Bruno, Jean-Yves Buffiere, Thomas Wegener, Thomas Niendorf, Tao Wu, Xiang Zhang, Nikolai Kashaev, Giovanni Meneghetti, Nik Hrabe, Mauro Madia, Tiago Werner, Kai Hilgenberg, Martina Koukolikova, Radek Prochazka, Jan Dzugan, Benjamin Moeller, Stefano Beretta, Alexander Evans, Rainer Wagener, Kai Schnabel
Summary: The article discusses key challenges in the damage-tolerant design of additively manufactured parts, highlighting parameters affecting damage tolerance and introducing new concepts that impact fatigue life determination. This interlinking of component design, damage criteria, and characterization represents a current challenge for engineers and materials scientists in the field.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Automation & Control Systems
Soran Hassanifard, Mohammad Reza Adibeig, Seyed M. Hashemi
Summary: This study evaluates the strain-based fatigue parameters of Ti-6Al-4V alloys fabricated through additive manufacturing (AM) and assesses their accuracy. The effects of AM methods, building direction, and post-processing techniques on the fatigue parameters are considered, and various case studies are conducted to validate the predicted results.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Ilaria Roveda, Itziar Serrano-Munoz, Jan Haubrich, Guillermo Requena, Mauro Madia
Summary: The microstructure of metallic materials greatly affects the growth of short fatigue cracks. Laser-based Powder Bed Fusion AlSi10Mg alloys have a fine fibrous Si structure and a supersaturated solid solution of Si in the α-Al matrix in the as-built condition, which is significantly changed by heat treatments below 260°C. This study focuses on the influence of post-process heat treatments on the microstructural evolution and the resulting fatigue crack growth resistance. Compared to the as-built condition, two heat treatments at 265°C/1 h and at 300°C/2 h are found to be beneficial to the fatigue crack growth resistance of the investigated material.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Yabo Hu, Jizheng Yao, Min Ao, Chaofang Dong
Summary: A low carbon CoCrMoW alloy was manufactured through laser beam powder bed fusion technique, with nanoscale intermetallic Co-3(Mo,W)(2)Si precipitates dispersed uniformly and showing improved corrosion resistance compared to the wrought alloy.
Article
Chemistry, Multidisciplinary
Muthu Vignesh Vellayappan, Francisco Duarte, Cyrille Sollogoub, Justin Dirrenberger, Alain Guinault, Jessica E. Frith, Helena C. Parkington, Andrey Molotnikov, Neil R. Cameron
Summary: Tissue engineering benefits from advances in 3D printing and multi-material assembly to attain certain functional benefits over existing man-made materials. In this study, a facile process is reported to manufacture biomaterials with an engineered multilayer architecture, which can significantly improve the morphology and functionality of cardiomyocytes compared to single phase materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sungcheol Park, Yuya Tanaka, Saburo Okazaki, Yusuke Funakoshi, Hideto Kawashima, Hisao Matsunaga
Summary: Torsional fatigue testing on AM Alloy 718 revealed that microstructural features, including twist angle and tilt angle, played a significant role in crack growth behavior. The impact of precipitates on crack growth rate was found to be insignificant.
Article
Engineering, Biomedical
Linzhi Jing, Jie Sun, Hang Liu, Xiang Wang, Dejian Huang
Summary: Blending plant proteins with synthetic biopolymers can significantly improve the tensile properties of scaffolds and promote cell adhesion and proliferation. The gradual release of plant protein nanoparticles into the culture medium facilitates cellular attachment, migration, and proliferation on scaffold fiber surfaces.
INTERNATIONAL JOURNAL OF BIOPRINTING
(2021)
Article
Engineering, Mechanical
Anirban Bhattacharya, Surajit Kumar Paul, Abhay Sharma
Summary: The present study utilizes a two-camera digital image correlation (DIC)-based technique to simultaneously measure strain on two mutually orthogonal surfaces, capturing the strain accumulation and subsequent failure behavior of WAAM deposited low carbon steel samples. Multiple delaminations and strain accumulation sites are observed due to weak interlayer consolidation, and delamination propagation contributes to failure. Dimples and intergranular fractures are observed on failure surfaces. High cycle fatigue tests result in premature failure near internal defects, and fatigue crack initiation and propagation are distinct on fracture surfaces.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Biomedical
Pedro J. Diaz-Payno, Maria Kalogeropoulou, Iain Muntz, Esther Kingma, Nicole Kops, Matteo D'Este, Gijsje H. Koenderink, Lidy E. Fratila-Apachitei, Gerjo J. V. M. van Osch, Amir A. Zadpoor
Summary: A 4D biofabrication method for cartilage engineering is reported, which uses a smart multi-material system to create shape-changing constructs. By printing two different ink formulations with differential swelling, the scaffold self-bends to achieve the desired shape. High cell viability is demonstrated in a bioprinted formulation with human bone marrow cells.
ADVANCED HEALTHCARE MATERIALS
(2023)
Review
Computer Science, Interdisciplinary Applications
Llion Marc Evans, Emrah Sozumert, Bethany E. Keenan, Charles E. Wood, Anton du Plessis
Summary: Image-Based Simulation (IBSim) is the process of generating a digital representation of a real geometry from image data for more accurate simulations than idealised CAD-based simulations. The adoption of imaging for non-destructive testing and evaluation in the High-Value Manufacturing (HVM) sector has expanded the use of IBSim in recent years. IBSim is invaluable for scenarios with significant variations between designed and manufactured parts, as well as for complex geometries that cannot be accurately drawn with CAD. The simulations are specific to the imaged geometry, enabling part-specific virtual testing within manufactured batches.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Biomedical
Jonne T. H. Prins, Suzanne F. M. Van Wijck, Sander A. Leeflang, Gert-Jan Kleinrensink, Lawrence Lottenberg, Pablo Moreno de la Santa Barajas, Pieter J. Van Huijstee, Jefrey Vermeulen, Michael H. J. Verhofstad, Amir A. Zadpoor, Mathieu M. E. Wijffels, Esther M. M. Van Lieshout
Summary: The study aimed to compare the biomechanical properties of fractured or intact ribs after implant fixation. The results showed that the relative difference in stiffness for fixated intact ribs ranged from -0.14 to 0.53, while for fixated fractured ribs it ranged from -0.88 to 0.17. The most common failure mode was a new fracture at the most anterior drill hole for plate and screw systems, and a new fracture within the anterior portion of the implant for clamping systems. These findings provide guidance for more specific implant selection and increase awareness of hardware complaints or failure for surgeons.
CLINICAL BIOMECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Livia Angeloni, Bogdan Popa, Mahdiyeh Nouri-Goushki, Michelle Minneboo, Amir A. Zadpoor, Murali K. Ghatkesar, Lidy E. Fratila-Apachitei
Summary: This study investigates the interaction between preosteoblasts and 3D-printed patterns using fluidic force microscopy and atomic force microscopy. The study reveals that taller pillar surfaces exhibit stronger cell adhesion strength and resistance to shear forces, which is crucial for the rational design of osteogenic patterns.
Article
Dentistry, Oral Surgery & Medicine
Frederick E. Grine, Carrie S. Mongle, William Kollmer, Georgios Romanos, Anton du Plessis, Bruno Maureille, Jose Braga
Summary: The study examined Homo sapiens fossils from the Late Pleistocene site of Klasies River Main Site in South Africa for evidence of hypercementosis. Two of the fossils displayed marked hypercementosis, providing the earliest manifestation of this condition in Homo sapiens. Another fossil showed dento-alveolar ankylosis, causing fusion of root and alveolar bone.
ARCHIVES OF ORAL BIOLOGY
(2023)
Article
Geosciences, Multidisciplinary
S. H. Buttner, A. van Huyssteen, E. Marima, A. du Plessis, M. Tshibalanganda, C. Schmidt, G. H. Howarth
Summary: Ilmenite and olivine megacrysts from the Monastery kimberlite in South Africa contain abundant and large melt inclusions, indicating primary crystal growth near the base of the subcontinental lithospheric mantle. Melt inclusions in olivine were captured in skeletal voids and commonly decrepitated during magma ascent. In ilmenite, the melt inclusions remained intact during the kimberlite ascent. Both olivine and ilmenite-hosted melt inclusions show systematic major element compositional variations.
Article
Automation & Control Systems
Thomas Feldhausen, Bharat Yelamanchi, Alexander Gomez, Anton Du Plessis, Lauren Heinrich, Kyle Saleeby, Kenton Fillingim, Brian Post, Lonnie Love, Pedro Cortes, Eric MacDonald
Summary: The combination of additive and subtractive manufacturing in hybrid directed energy deposition allows for the creation of complex geometries with smooth surfaces and high dimensional accuracy. Ceramic inserts are used for various purposes, such as creating composite materials or integrating sensors within a metal structure. Different strategies were tested to successfully embed ceramic components within a 3D-printed stainless steel structure, including the use of wet powder as a thermal barrier and oblique angle laser cladding to redirect thermal energy.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Mechanical
L. Barricelli, L. Patriarca, A. du Plessis, S. Beretta
Summary: The fatigue behavior of Laser-Powder Bed Fusion (L-PBF) produced parts is influenced by the surface morphology, which depends on the relative orientation between the surface and the build direction. This study focuses on investigating the factors that correlate with the fatigue performance of L-PBF Ti6Al4V specimens in different orientations. A Fracture Mechanics-based model, using measurable roughness parameters, is employed to predict the fatigue properties. The results show that the predicted stress-life curves are accurate when considering the maximum profile depth and the shielding factor, taking into account the effect of surface orientation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Multidisciplinary Sciences
Sebastien J. P. Callens, Daniel Fan, Ingmar A. J. van Hengel, Michelle Minneboo, Pedro J. Diaz-Payno, Molly M. Stevens, Lidy E. Fratila-Apachitei, Amir A. Zadpoor
Summary: The organization of bone cells in landscapes with varying curvatures was studied, revealing a preference for local concavities, multicellular bridging, and collective stress fiber orientation.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Nanoscience & Nanotechnology
Amir A. A. Zadpoor, Mohammad J. J. Mirzaali, Lorenzo Valdevit, Jonathan B. B. Hopkins
Summary: This article introduces a special type of engineered material called metamaterials, which have unusual and unique properties due to their microarchitecture. In the past decade, new categories of metamaterials have emerged, with applications in various fields such as optics, electromagnetism, acoustics, mechanics, biomaterials, and thermal engineering. The article reviews important developments in the design and fabrication of metamaterials, with a focus on recent categories, and suggests directions for future research.
Review
Nanoscience & Nanotechnology
Ebrahim Yarali, Amir A. Zadpoor, Urs Staufer, Angelo Accardo, Mohammad J. Mirzaali
Summary: Mechanical and morphological design parameters are important in orthopedic implants and bone substitutes, but the role of microarchitecture in porous scaffolds for bone regeneration is not well understood. Meta-biomaterials with unique properties, such as negative Poisson's ratios, are used to engineer porous scaffolds and investigate their interactions with living cells. This review summarizes recent studies on the effects of Poisson's ratio on meta-biomaterial performance and highlights additive manufacturing techniques for creating meta-biomaterials at the micrometer scale. Future perspectives on designing next-generation meta-biomaterials with dynamic properties, such as those made through 4D printing, are also discussed.
ACS APPLIED BIO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Pier H. de Jong, Y. Salvatori, F. Libonati, Mohammad J. Mirzaali, Amir A. Zadpoor
Summary: Shape morphing is the ability of objects to adapt to different shapes, and it has various applications in fields such as soft robotics and orthopedic implants. This paper presents a magnetic locking mechanism for kinematically deformable metamaterial structures, which can maintain shape and support loads. The viability of the locking concept is demonstrated through prototypes and mechanical tests, providing design considerations for future applications.
MATERIALS & DESIGN
(2023)
Article
Engineering, Mechanical
Mahdi Karimi, Mohammad Javad Khoshgoftar, Mohammad Karimi, Mohammad Javad Mirzaali, Zia Javanbakht
Summary: This paper presents an analytical model to investigate the static behaviour of sandwich plates comprised of two isotropic face sheets and a honeycomb core. The model considers through-thickness transverse shear stresses using various plate theories. The results show that the auxeticity of the core strongly affects the mechanical response, and parameters such as cell wall angle and cell aspect ratio have significant impacts on anisotropy, deflection, and shear stress distribution.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Mauricio Cruz Saldivar, Shima Salehi, Robin Petrus Elias Veeger, Edwin Tay, Michele Fenu, Astrid Cantamessa, Maria Klimopoulou, Giuseppe Talo, Matteo Moretti, Silvia Lopa, Davide Ruffoni, Gerjo J. V. M. van Osch, Lidy Elena Fratila-Apachitei, Zjenja Doubrovski, Mohammad Javad Mirzaali, Amir Abbas Zadpoor
Summary: This study examines the relationship between different materials' hardness through the use of functional gradients. By utilizing 3D-printed voxels, a power law model is established to guide the creation of biomimetic constructs with superior mechanical properties. Additionally, the study explores how functional gradients influence cell morphology and protein expression, providing insights for the design of soft-hard interfaces in biomedical applications.
CELL REPORTS PHYSICAL SCIENCE
(2023)