Article
Engineering, Multidisciplinary
Che Wang, Weihong Zhang, Lu Zhou, Tong Gao, Jihong Zhu
Summary: This paper presents a B-spline based topology optimization method to design self-supporting structures for additive manufacturing, which effectively controls overhang using B-spline parameterization and Heaviside function. The proposed method is demonstrated to be independent of the FE mesh and works well with free-form design domains.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Manufacturing
Sven Mueller, Peer Woizeschke
Summary: This study investigates the thermal joining of aluminum and titanium sheets using a laser powder bed fusion machine. Despite the melting of materials, there is great potential for high interfacial tensile strength in laser fusion of titanium powder on aluminum substrates.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
P. Ashwath, M. Anthony Xavior, Andre Batako, P. Jeyapandiarajan, J. Joel
Summary: Additive Manufacturing (AM) and Selective Laser Melting (SLM) are advanced manufacturing methods widely used in the aerospace industry. Current research focuses on using SLM to fabricate Al-Si-10Mg aluminum alloy and study the effects of scanning speed and build orientation on the mechanical strength and surface finish of the components. This research is of importance for dynamic applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Multidisciplinary
Mingdong Zhou, Yufan Lu, Yichang Liu, Zhongqin Lin
Summary: This paper presents a systematic design optimization approach for shells with self-supporting infills for Additive Manufacturing (AM). The design workflow involves concurrent Topology Optimization (TO) of the shells and infills, with a focus on overhang control and manufacturability requirements. By utilizing a density based TO approach and a two-field based formulation, the optimized infills can support the shells and meet mechanical properties regardless of voxel granularity.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Chemistry, Physical
Filip Vele, Michal Ackermann, Vaclav Bittner, Jiri Safka
Summary: The study investigates the impact of SLM technology on the porosity and hardness of AISI H13 tool steel, identifying the minimum energy density required for a satisfactory density and hardness level, and proposing phenomenological models based on experimental data analysis.
Article
Multidisciplinary Sciences
Arif Balci, Furkan Kucukaltun, M. Fatih Aycan, Yusuf Usta, Teyfik Demir
Summary: The study produced trabecular bone models with a designable microstructure using selective laser melting, scanned them with Micro-CT, and aligned 3D models to determine deviations. It was observed that deviations decreased with angles above 60 degrees, while increasing significantly with sizes below 150 microns.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
D. Palmeri, G. Buffa, G. Pollara, L. Fratini
Summary: Recent research has focused on new production technologies to optimize production and reduce costs, including additive manufacturing processes like Selective Laser Melting (SLM). However, literature analysis shows conflicting results in determining the optimal building orientation for maximizing mechanical properties and minimizing porosity. A study evaluated the building orientation effect and identified three geometrical parameters to understand the causes of decreased mechanical properties due to incorrect orientation angle choices.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Qimin Shi, Yi Sun, Shoufeng Yang, Jeroen Van Dessel, Heinz-Theo Luebbers, Shengping Zhong, Yifei Gu, Michel Bila, Titiaan Dormaar, Joseph Schoenaers, Constantinus Politis
Summary: A multidimensional and comprehensive analysis of the in-vivo fatigue failure mechanism of an SLM-fabricated Ti6Al4V mandible reconstruction plate reveals that surface defects and maximal stress caused by implant design are the main factors for crack initiation and propagation, showing a combined brittle/ductile fracture mode. The process is influenced by Ca/P/O deposits and hydrogen embrittlement under the biological environment.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Hua Yan, Guangyu Zhu, Haichuan Shi, Peilei Zhang, Haichao Li, Qinghua Lu, Zhiyuan Li
Summary: This study compared the microstructure and mechanical properties of K438 nickel-based high-temperature alloy samples prepared and heat-treated via selective laser melting (SLM). The findings suggest the significant impact of SLM process parameters and heat treatment on the material properties, highlighting the importance of these factors in material preparation.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Hua Yan, Guangyu Zhu, Haichuan Shi, Peilei Zhang, Haichao Li, Qinghua Lu, Zhiyuan Li
Summary: The K438 nickel-based high-temperature alloy prepared by selective laser melting (SLM) underwent heat treatment resulting in a transition in grain boundaries and refinement of grain size, leading to an increase in ultimate tensile strength (UTS).
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Mechanical
Liping Ding, Shujie Tan, Wenliang Chen, Yaming Jin, Yicha Zhang
Summary: This study investigates the manufacturability of extremely fine porous structures in the SLM process, revealing the importance of process parameters and printing planning on the results. It proposes a method for manufacturability analysis and printing parameter control of fine porous structures.
RAPID PROTOTYPING JOURNAL
(2021)
Article
Engineering, Industrial
Adam Clare, Alex Gullane, Christopher Hyde, James W. Murray, Simon Sankare, Wessel W. Wits
Summary: This study demonstrates a method for varying layer thickness within single components to locally manipulate material and structural properties. This creates a new design freedom for laser powder bed fusion technology, allowing for customizable geometries and functional grading.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Industrial
Wessel W. Wits, Emiel Amsterdam
Summary: In laser powder bed fusion, multi-material mixing and elemental diffusion were studied for the fabrication of functionally graded structures. An adapted recoater was used to deposit powder from multiple sources, creating a more gradual material transition. Homogenization heat treatment enhanced elemental diffusion, resulting in a gradual material transition without a distinct interface.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
J. Karimi, C. Suryanarayana, I Okulov, K. G. Prashanth
Summary: This study investigated the effect of remelting on the microstructure and mechanical properties of Ti6Al4V materials fabricated using selective laser melting. The results showed that the number of remeltings significantly influenced the homogenization of the microstructure and mechanical properties of the materials, with an increase in hardness and ultimate tensile strength but a decrease in ductility observed with a higher number of melting steps.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Shuohong Gao, Xingchen Yan, Cheng Chang, Eric Aubry, Pengjiang He, Min Liu, Hanlin Liao, Nouredine Fenineche
Summary: The study prepared FeSiBCrC bulk soft magnetic alloy using selective laser melting technology, with high microhardness and good soft magnetic properties. The alloy is mainly composed of several crystalline phases, demonstrating the potential of fabricating bulk Fe-Si based amorphous soft magnetic alloys.
Article
Engineering, Multidisciplinary
Jie Gao, Hao Li, Zhen Luo, Liang Gao, Peigen Li
INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS
(2020)
Article
Engineering, Multidisciplinary
Jie Gao, Zhen Luo, Mi Xiao, Liang Gao, Peigen Li
APPLIED MATHEMATICAL MODELLING
(2020)
Article
Acoustics
Xianfeng Man, Baizhan Xia, Zhen Luo, Jian Liu, Kun Li, Yonghong Nie
Summary: Acoustic metamaterials with fractal structures, such as LFAMs, are engineered to regulate sound propagation behavior on subwavelength scales, showcasing multi-band blocking and absorption capabilities. The dispersion relations, effective properties, and sound suppression abilities of LFAMs are systematically analyzed to explore their potential applications for low-frequency sound control.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Engineering, Multidisciplinary
Shuhao Wu, Zhen Luo, Zuyu Li, Shutian Liu, Lai-Chang Zhang
Summary: PMMs are a new class of three-dimensional mechanical metamaterials with vanishing shear modulus, designed based on structural architecture rather than composition, achieved through topology optimization for pentamode properties.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Zuyu Li, Zhen Luo, Lai-Chang Zhang, Chun-Hui Wang
Summary: This paper presents an efficient topology optimization method for discovering novel pentamode lattice microarchitectures with certain elastic symmetries, and demonstrates the effectiveness of the proposed method by using a genetic algorithm to solve the topology optimization problem.
MATERIALS & DESIGN
(2021)
Article
Biophysics
Ramtin Gharleghi, Heidi Wright, Vanessa Luvio, Nigel Jepson, Zhen Luo, Anushan Senthurnathan, Behzad Babaei, B. Gangadhara Prusty, Tapabrata Ray, Susann Beier
Summary: The study focused on optimizing stent designs for hemodynamic performance by identifying ideal combinations of design variables. The usage of multi-objective optimization algorithms helped predict ideal designs that could reduce adverse events risk and enhance mechanical performance of the stents. Three best designs for each objective and two overall best designs were identified out of 50 designs.
JOURNAL OF BIOMECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Jie Gao, Lin Wang, Zhen Luo, Liang Gao
Summary: This paper presents a compact and efficient MATLAB code for isogeometric topology optimization (ITO), showcasing the development and functions of various components, and demonstrating the effectiveness of the code through numerical examples.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Materials Science, Multidisciplinary
Yongfeng Zheng, Yingjun Wang, Zhen Luo, Xiang Lu, Jinping Qu
Summary: This study introduces a novel method for the robust design of structures and material microstructures, utilizing orthogonal decomposition, uniform sampling, and polynomial chaos expansion to handle uncertainties. An evolutionary method is employed to find the optimal topology, and a dimensionless index is defined to evaluate the robustness of deterministic and robust designs.
MATERIALS & DESIGN
(2021)
Review
Biotechnology & Applied Microbiology
Huipeng Xue, Suvash C. Saha, Susann Beier, Nigel Jepson, Zhen Luo
Summary: This paper designs a new type of auxetic metamaterial-inspired structural architectures to innovate coronary stents under hemodynamics, aiming to reduce the occurrence of stent thrombosis and in-stent restenosis. A multiscale level-set approach with numerical homogenization method and computational fluid dynamics is applied, proposing a homogenized effective modified fluid permeability to efficiently connect design variables with blood flow motions around the stent.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Yuan Feng, Qihan Wang, Di Wu, Zhen Luo, Xiaojun Chen, Tianyu Zhang, Wei Gao
Summary: This paper presents a machine learning aided non-deterministic damage prediction framework for both 2D and 3D fracture problems. By introducing extended support vector regression (X-SVR) with generalized Dirichlet feature mapping into the phase field crack growth model, a method for crack diagnosis and prognosis is designed. The framework can establish a continuous damage assessment loop for evaluating the latest working condition of the structure and predicting potential crack propagation.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Chemistry, Analytical
Jinqing Zhan, Yifeng Li, Zhen Luo, Min Liu
Summary: This paper presents a method for the topological design of multi-material compliant mechanisms with global stress constraints. The approach maximizes the output displacement of multi-material compliant mechanisms while meeting the stress constraints for each material. The method involves element stacking and separable stress interpolation, as well as the use of modified P-norm method and adjoint method for calculating stress constraints.
Article
Materials Science, Multidisciplinary
Xing Zhang, Hongling Ye, Nan Wei, Ran Tao, Zhen Luo
Summary: This study successfully designed three-dimensional metamaterials with negative thermal expansion and phononic bandgap properties using the independent continuous mapping (ICM) topology optimization method and a surrogate model-based optimization method.
MATERIALS & DESIGN
(2021)
Article
Engineering, Multidisciplinary
Mahmoud Alfouneh, Van-Nam Hoang, Zhen Luo, Quantian Luo
Summary: This article investigates the topology optimization of multi-layer multi-material composite structures under static loading. The moving iso-surface threshold optimization method, previously defined for single or cellular materials, is extended to multi-layer multi-material structures using a physical response function discrepancy scheme. It is also integrated with an alternating active-phase algorithm as an alternative procedure. The proposed methods are applied to three types of objective functions, namely, minimizing compliance, maximizing mutual strain energy, and minimizing full-stress designs. Examples are presented and compared with existing literature to verify the derived formulations for topology optimization of multi-layer multi-material structures.
ENGINEERING OPTIMIZATION
(2023)
Article
Materials Science, Multidisciplinary
Zuyu Li, Wei Gao, Michael Yu Wang, Zhen Luo
Summary: Auxetic metamaterials are mechanically unique materials with negative Poisson's ratios and counter-intuitive deformation behavior. This paper presents a systematic method for designing novel three-dimensional auxetic microlattices. The optimized microlattices exhibit desired properties such as elastic isotropy, negative Poisson's ratio, and zero thermal expansion. The study demonstrates the potential of these materials for various applications.
MATERIALS & DESIGN
(2022)
Article
Multidisciplinary Sciences
Sheikh Hossain, Zhen Luo, Evelyne Deplazes, Suvash C. Saha
Summary: This study investigates the effects of different shaped AuNPs on model LSM through molecular dynamics simulations, finding that AuNPs have a greater impact on the compressed state of the monolayer, preventing it from reaching the surface tension required for normal exhalation and thinning the monolayer. Insights from this study may aid future research on how AuNP shapes affect the LSM during inhalation or exhalation.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2021)
Article
Engineering, Manufacturing
Przemyslaw Golebiewski, Pawel Wienclaw, Jaroslaw Cimek, Pawel Socha, Dariusz Pysz, Adam Filipkowski, Grzegorz Stepniewski, Olga Czerwinska, Ireneusz Kujawa, Ryszard Stepien, Rafal Kasztelanic, Andrzej Burgs, Ryszard Buczynski
Summary: We report the development of a 3D printing process for producing soft glass optical fibers. The process involves direct printing using a miniaturized crucible and depositing straight horizontally-oriented lines to replace traditional assembly techniques. Experimental results demonstrate good performance of the printed photonic crystal fiber preform.
ADDITIVE MANUFACTURING
(2024)