Article
Polymer Science
Riccardo Tonello, Knut Conradsen, David Bue Pedersen, Jeppe Revall Frisvad
Summary: Selective laser sintering (SLS) is a well-established additive manufacturing technology. Efforts have been made to improve SLS by optimizing powder deposition, laser parameters, and temperature settings. This study evaluated the surface roughness and grain size differences of curved objects manufactured using a new SLS technology featuring two CO laser sources. Significant differences were found in some surface roughness and grain size measurements when varying build setup, presence of thin walls, and sample position on the powder bed.
Article
Materials Science, Multidisciplinary
Caterina Iantaffi, Eral Bele, David Mcarthur, Peter D. Lee, Chu Lun Alex Leung
Summary: This study investigates the compressive performance of auxetic cubic chiral structures, finding that energy absorption and auxeticity are dependent on the relative density of the constitutive struts. The research also reveals that in the plastic regime, the auxeticity decreases with relative density.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Burcin Ozbay Kisasoz, I. Ersin Serhatli, M. Enes Bulduk
Summary: This study compares the physical and mechanical properties of sintered components by adding different amounts of hollow glass microspheres to polyamide 12. The results show the best composite structures and density reduction method.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Ceramics
Marco Pelanconi, Giovanni Bianchi, Paolo Colombo, Alberto Ortona
Summary: This study reported the fabrication of Silicon infiltrated Silicon Carbide (SiSiC) components using a hybrid additive manufacturing process, combining 3D printing of polymeric preforms with controlled relative density and preceramic polymer infiltration followed by pyrolysis. The final densification was achieved via liquid silicon infiltration, resulting in a nearly fully dense material of beta-SiC and Si in specific volume fractions. This approach eliminates the need for adding ceramic powder to the infiltrating solution, offering an alternative AM method for producing SiSiC ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Marco Pelanconi, Paolo Colombo, Alberto Ortona
Summary: The study introduces a novel hybrid additive manufacturing technique that combines selective laser sintering (SLS) of polyamide powders with preceramic polymer infiltration and pyrolysis to create Silicon Carbide components. The mechanical strength of the resulting ceramic increased up to 24 MPa with more reinfiltration cycles, while the residual porosity decreased to 10%. The microstructure exhibited phases of SiOC and SiC, with SiC derived from the pyrolysis of the preceramic precursor.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Automation & Control Systems
Hong-Tzong Yau, Che-Wei Hsu
Summary: This paper proposes a 3D nesting algorithm that combines FPA and OBB collision detection for packing irregular shaped objects in powder-based additive manufacturing. The method finds near-optimal solutions by reducing the computation time of collision detection.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Pawel Turek, Anna Bazan, Andrzej Zakrecki
Summary: Additive techniques are becoming more popular due to advancements in 3D printing and innovative materials. This article presents the results of surface roughness tests on polyamide PA12 samples made using different printing methods, and recommends the best manufacturing method and finishing process based on the findings.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Engineering, Chemical
Moritz Ruether, S. Helge Klippstein, SathishKumar Ponusamy, Torben Ruether, Hans-Joachim Schmid
Summary: By analyzing the polymer powders at different temperatures, the flowability and spreadability of the powders for selective laser sintering were investigated. The Revolution Powder Analyzer and the modified Schulze Ring Shear Tester were used for the measurements. Results of both tests showed that the powders' flowability decreases with increasing temperature, especially near the materials' melting point. Recoating tests on an EOS P395 machine revealed that the number and severity of defects increase with temperature, but they greatly decrease when approaching the sintering window, resulting in a stronger and more defect-resistant powder bed.
Article
Automation & Control Systems
Maedeh Amirpour, Mark Battley
Summary: This study investigates the static compression behavior of polyamide 12 body-centred cube lattices manufactured using the SLS method through theoretical, numerical, and experimental studies. Results show good agreements among analytical, numerical, and experimental results, highlighting the importance of considering filament defects for accurate responses in analytical modeling and FE simulation.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Andrew T. Polonsky, Narendran Raghavan, McLean P. Echlin, Michael M. Kirka, Ryan R. Dehoff, Tresa M. Pollock
Summary: Three-dimensional characterization is used to understand the processing-structure relationships in additively manufactured materials. In this study, electron beam melting is used to fabricate bulk samples of Inconel 718, and TriBeam tomography and thermal simulation software are used to analyze the microstructural development and predict grain morphologies. The research provides insight into controlling the as-printed microstructure and understanding the competing processes of grain nucleation and epitaxial growth.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Manufacturing
Paul Victor Osswald, Philip Obst, Gerardo A. Mazzei Capote, Martin Friedrich, Dominik Rietzel, Gerd Witt
Summary: Additive manufacturing techniques are attractive to various industries for producing complex geometries in compressed product development cycles, however, the stratified build approach used by these technologies leads to subpar mechanical properties at the junction of adjacent layers, making it difficult to assess the structural integrity of parts under complex loads. In the industrialization of series production of AM parts, understanding and predicting failure mechanisms under complex stress states become crucial.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Multidisciplinary
Demetris Photiou, Stelios Avraam, Francesco Sillani, Fabrizio Verga, Olivier Jay, Loucas Papadakis
Summary: Auxetic structures with negative Poisson ratio exhibit enhanced mechanical properties and can be produced with complex shapes using additive manufacturing. By controlling geometry and material composition, different aspects of auxetic structures can be explored with various materials.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Michal Karoluk, Gustaw Koenig, Tomasz Kurzynowski
Summary: This paper presents a method for addressing medical equipment shortages during the COVID-19 pandemic by testing and evaluating materials to manufacture adapters connecting masks with filters, thus increasing the number of available masks for medical personnel and ensuring the continuity of their work.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Kadir Gunaydin, Halit Sueleyman Tuerkmen, Alessandro Airoldi, Marco Grasso, Giuseppe Sala, Antonio Mattia Grande
Summary: In this study, the cyclic compression and crush behavior of chiral auxetic lattice structures produced from titanium alloy using electron beam melting additive manufacturing technology were investigated. The research found that the constitutive equation of as-built parts could be accurately extracted considering the build orientation and surface roughness profile. Furthermore, the cyclic compressive and crush behavior of chiral units were examined, identifying regions prone to premature failure and investigating deformation modes to enhance energy absorption abilities.
Article
Materials Science, Composites
Nikolas Matkovic, Katja Hoeger, Marco Friedmann, Florian Stamer, Juergen Fleischer, Gisela Lanza
Summary: Additive manufacturing processes like fused filament fabrication (FFF) allow for highly customized production and lightweight structures. However, the mechanical properties of FFF are lower, so the use of continuous fibers and consolidation steps are investigated to improve the properties. Four strategies for hybridization of pre-impregnated carbon fiber tapes with FFF-printed parts are studied and evaluated.
COMPOSITES COMMUNICATIONS
(2023)
Article
Electrochemistry
Yikun Wu, Shengxin Zhu, Zenghui Wang, Peijun Zhou, Fuguo Xie, Jiang Zhou, Hao-Sen Chen, Wei-Li Song, Daining Fang
Summary: This study focuses on the strain of the steel case during operation of 18650 Li-ion battery cells, revealing an inhomogeneous strain distribution issue after long-term cycling. It is identified that the gap between the jelly roll and steel case is the root cause of different strain distribution on the steel case. It is suggested to pay attention to the gap in the engineering design of cylindrical Li-ion battery cells with next-generation silicon composite electrode.
ELECTROCHIMICA ACTA
(2021)
Article
Engineering, Mechanical
Zhiwen Ren, Longtao Ji, Ran Tao, Mingji Chen, Zhishuai Wan, Zeang Zhao, Daining Fang
Summary: This work proposes a method of creating geometrically reconfigurable and mechanically tunable multi-stable metamaterials to realize a kind of tunable elastic metamaterial with a stable state during the active regulation without continuous-consuming energy based on 4D printing technology. The tunable elastic metamaterial can adjust the starting/ending frequencies, broaden the frequency ranges of bandgaps and control the elastic wave propagation. The method can be used in vibration-isolated steady-state adjustable equipment and smart wave device, and a bi-stable logic-gate elastic metamaterial is implemented to correctly execute simple wave logic operations.
EXTREME MECHANICS LETTERS
(2021)
Article
Materials Science, Ceramics
Bowen Lv, Zhaoliang Qu, Baosheng Xu, Yiguang Wang, Daining Fang
Summary: A numerical model has been developed to study the surface crack propagation in brittle ceramic coatings under combustion conditions in advanced gas turbines, specifically focusing on the failure of rare-earth silicate environmental barrier coating systems. The study reveals that rapid crack propagation during extended thermal cycling is the dominant mechanism leading to catastrophic failure of the coating.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Le Yang, Na Li, Likun Hu, Shaoqi Wang, Lin Wang, Jiang Zhou, Wei-Li Song, Lei Sun, Tai-Song Pan, Hao-Sen Chen, Daining Fang
Summary: A novel in-situ temperature sensing framework is proposed in this study, incorporating temperature sensors with a signal transmission solution to transmit internal measurements outside batteries without interfering their normal state. Extensive experimental results validate the effectiveness of this framework, showing promising potential for in-situ battery health monitoring and promoting the development of smart batteries.
ACTA MECHANICA SINICA
(2021)
Article
Chemistry, Physical
Yixing Huang, Dong Wu, Mingji Chen, Kai Zhang, Daining Fang
Summary: A glass fiber/carbon fiber reinforced honeycomb metastructure with wide absorption bandwidth and high mechanical strength was designed and fabricated, successfully integrating electromagnetic absorption and mechanical resistance.
Article
Mechanics
Xiaofei Cao, Zhixin Huang, Chunwang He, Wenwang Wu, Li Xi, Ying Li, Daining Fang
Summary: This study investigates the mechanical behavior of micro Schwarz Primitive triply periodic minimal surfaces (P-TPMS) structures, and quantifies the effect of defects on their compression mechanical performances using various methods. Finite element models were developed to understand the impact of fabrication defects on mechanical behavior, showing that the statistical model was more accurate and efficient. Parametric study was also conducted to gain insight into the role of thickness imperfections on the mechanical performance of the shell.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
P. Wang, K. F. Wang, B. L. Wang, L. Xi, K. Sano, T. Shimada, H. Hirakata, D. N. Fang
Summary: This study aims to stably and accurately measure the interlaminar fracture toughness (IFT) of multilayered Bi2Te3 for evaluating the reliability of its thermoelectric devices. By developing a tapered cantilever bending (TCB) experiment, the measurement of IFT for Bi2Te3 was successfully achieved, providing a new method for assessing multilayered materials.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Composites
Qiubo Li, Yihui Chen, Yanfei Chen, Shigang Ai, Daining Fang
Summary: This study aims to investigate the effect of void defects on the failure behavior and strength of C/SiC composites. Micro-computed tomography and finite element models were used to study the influence of void volume fractions and geometry on the materials. This research is important for better understanding the impact of defects on the mechanical behavior of composite materials.
APPLIED COMPOSITE MATERIALS
(2022)
Article
Mechanics
Dong Wu, Zeang Zhao, Hongshuai Lei, Hao-Sen Chen, Qiang Zhang, Panding Wang, Daining Fang
Summary: Natural tissues can self-strengthen through biological growth, while synthetic materials are typically static. The concept of bio-inspired materials aims to develop materials with dynamically programmable performances. A solvent-free elastomer composite system is proposed in this study, which can be strengthened through tunable self-growth cycles and is compatible with Digital Light Processing (DLP) 3D printing for fast manufacturing of high-precision structures.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Huimin Li, Baosheng Liu, Lei Ge, Yi Chen, Huayong Zheng, Daining Fang
Summary: This study investigates the mechanical performance of continuous carbon fiber reinforced PLA composites printed in vacuum. Special 3D printing equipment and raw material production devices are utilized to improve impregnation effect, reduce porosity, and increase flexural strength and modulus. Research shows that printing temperature positively influences mechanical properties, while printing speed and layer thickness have negative effects.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Composites
Chunwang He, Jingran Ge, Xiaofei Cao, Yanfei Chen, Haosen Chen, Daining Fang
Summary: Manufacturing uncertainties in composites, such as carbon fiber deviations and voids, can impact mechanical properties. Although experiments have been conducted, quantitative characterization of fiber radius and shape deviations, and matrix void content, remain a challenge. A computational micromechanics study was conducted to understand the effects of manufacturing uncertainties on the mechanical behavior of UD composites under different loading conditions. The methodology involved establishing constitutive laws for constituents, modeling RVEs with deviations based on observations, and predicting stress-strain curves and failure modes.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yanfei Chen, Shigang Ai, Pan Wang, Daining Fang
Summary: A physically based constitutive model for braided silicon carbide ceramic matrix composites (CMCs-SiC) at ultra-high temperature is developed, considering material orthotropy, temperature effect, tension-compression asymmetry, and crack closure effect. The model, implemented using a return mapping algorithm, shows good agreement with experimental data in predicting stress-strain relationships at different stress states and temperatures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Jixiang Qi, Zihao Chen, Peng Jiang, Wenxia Hu, Yonghuan Wang, Zeang Zhao, Xiaofei Cao, Shushan Zhang, Ran Tao, Ying Li, Daining Fang
Summary: Active mechanical metamaterials combine mechanical metamaterials with smart materials for superior performance, with structures designed based on principles such as phase transition and strain mismatch. External stimuli like temperature, chemicals, and light are used for control and efficiency.
Article
Chemistry, Multidisciplinary
Handong Jiao, Zhaoliang Qu, Shuqiang Jiao, Yang Gao, Shijie Li, Wei-Li Song, Mingyong Wang, Haosen Chen, Daining Fang
Summary: Electrodeposition is a fundamental technology in modern society, and X-ray tomography allows for non-destructive and non-contact in situ visualization of the electrochemical processes and three-dimensional evolution of morphology, aiding in the precise optimization of electrodeposition conditions.
Article
Multidisciplinary Sciences
Handong Jiao, Zhaoliang Qu, Shuqiang Jiao, Yang Gao, Shijie Li, Wei-Li Song, Haosen Chen, Hongmin Zhu, Rongqi Zhu, Daining Fang
Summary: High-temperature electrochemistry is widely used but real-time observations and in-depth understanding of its evolution are limited. In this study, a high-temperature electrolysis facility with in situ x-ray computer microtomography was developed to probe the dynamic evolution of electrodes. The results provide insights into the efficiency and mechanisms of the process, as well as real-time optimization.
