检索结果-内蒙古大学图书馆

Review ® research and Development of Titanium-Containing Biomedical High Entropy Alloys (BioHEAs) Utilizing Rapid Solidification via Laser-Powder Bed Fusion+1

引用

Materials Transactions 2023年第1期64卷 31-36页

作者： Ozasa, Ryosuke Matsugaki, Aira Ishimoto, Takuya Nakano, Takayoshi Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Suita565-0871 Japan Anisotropic Design and Additive Manufacturing Research Center Osaka University Suita565-0871 Japan Aluminium Research Center University of Toyama Toyama930-8555 Japan

High entropy alloys (HEAs) have been developed as a new class of structural materials that consist of multicomponent elements with an approximately equiatomic ratio for increasing the mixing entropy to stabilize the solid solution phase. HEA for biomedical applications (BioHEA) was first developed in Japan;HEA comprising nonbiotoxic elements was specifically designed, demonstrating excellent mechanical properties and biocompatibility. However, elemental segregation, often observed in BioHEAs, hinders the inherent functions derived from high entropy effects and solid solution hardening. In this review article, elemental homogenization and functionalization of BioHEAs utilized by ultra-rapid cooling via laser-powder bed fusion and the characteristics of these BioHEAs, especially focusing on their excellent properties for biomedical applications, are introduced. [doi:10.2320/***-MLA2022011] ©2022 The Japan Institute of Light Metals.

关键词： Rapid solidification

来源：评论

学校读者我要写书评

暂无评论

Collaborative optimization design of process parameter and structural topology for laser additive manufacturing

引用

Chinese Journal of Aeronautics 2023年第1期36卷 456-467页

作者： Shaoying LI Hongkai WEI Shangqin YUAN Jihong ZHU Jiang LI Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China MIIT Lab of Metal Additive Manufacturing and Innovative Design Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

High-resolution laser additive manufacturing(LAM)significantly releases design free-dom,promoting the development of topology optimization(TO)and advancing structural design *** order to fully take advantage of voxelated forming methods and establish the quantitative relationship between the mechanical properties of printing components and multiple process factors(laser-and process-parameters),the concurrent optimization design method based on LAM should cover the process-performance *** study proposes a novel artificial intelligence-facilitated TO method for LAM to concurrently design microscale material property and macroscale structural topology of 3D components by adopting heuristic and gradient-based *** process–structure–property relationship of selective laser sintering is established by the back propagation neural network,and it is integrated into the TO algorithm for providing a systematic design scheme of structural topology and process *** with the classical optimization method,numerical examples show that this method is able to improve the mechanical performance of the macrostructure *** addition,the collaborative design method is able to be widely applied for complex functional part design and optimization,as well as case studies on artificial intelligence-facilitated product evaluation.

关键词： Back propagation neural network Gradient algorithm Laser additive manufactur-ing Process–structure–property Topology optimization

来源：评论

学校读者我要写书评

暂无评论

Raking process for Powder Bed Fusion of Ti-6Al-4V alloy Powder Analyzed by Discrete Element Method

引用

Keikinzoku/Journal of Japan Institute of Light Metals 2022年第6期72卷 291-297页

作者： Okugawa, Masayuki Isono, Yusuke Koizumi, Yuichiro Nakano, Takayoshi Anisotropic Design & Additive Manufacturing Research Center Osaka University Osaka Suita-shi Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka Suita-shi Japan

In order to avoid the formation of defects in additive manufacturing (AM) by powder bed fusion (PBF) process, it is crucial to understand the relationship between the quality of powder bed and a powder spreading process. In this study, the influences of conditions of powder raking process on the densities and homogeneity of powder bed have been examined by computer simulation using Discrete Element Method (DEM) and experiment of powder bed formation using a blade-type spreader for Ti-6Al-4V powder by way of example. The results were analyzed with a special focus on the effects of the relative size of powder particles with respect to the gap between the blade and the build platform. It has been clearly shown that the gap needs to be larger than the upper bound of the distribution of powder particles diameter to obtain a high-density powder bed. The DEM simulation indicated that the blade can sweep even powder particles that are not in direct contact with the blade when the powder particles are in a close-packed tetragonal configuration. This is the probable reason for the experimental fact that powder particles smaller than half of the gap are suitable for PBF. © 2022 The Japan Institute of Light Metals.

关键词： Finite difference method

来源：评论

学校读者我要写书评

暂无评论

Applying the Infrared Self-heating Method to a Comprehensive Fatigue Analysis of NiTi Shape Memory Alloys

引用

Acta Mechanica Solida Sinica 2024年第6期37卷 873-880页

作者： Yongdan Zhou Zihong Liu Yahui Zhang Xiaojun Gu Jihong Zhu Weihong Zhang State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an710072China

This paper aims to seek expedited fatigue analysis methods using the infrared self-heating *** fatigue analysis of NiTi shape memory alloys is obtained through a hybrid approach:fatigue tests to failure yield relatively shorter fatigue lives,while determining the fatigue limit,normally involving extremely high cycles approaching 107 cycles,is directly achieved via self-heating *** methodology significantly reduces testing cycles,costing only a fraction of the several-thousand-cycle tests typically *** validity of this approach is successfully demonstrated through fatigue testing of 18Ni steel:the entire S–N curve is examined using the traditional fatigue test until a life of up to 10^(7) cycles,and the indicated fatigue limit agrees well with the one directly determined through the self-heating ***,this developed approach is applied to the fatigue analysis of shape memory alloys under complex loading,enabling the concurrent estimation of the limits of phase transformation-dominated low-cycle fatigue and high-cycle fatigue in the elastic regime on a single *** results obtained align well with other supporting evidence.

关键词： Shape memory alloys Self-heating method Fatigue Fatigue limit S–N curve

来源：评论

学校读者我要写书评

暂无评论

Review―Importance of Atmospheric Gas Selection in Metal additive manufacturing: Effects on Spatter, Microstructure, and Mechanical Properties

引用

Materials Transactions 2023年第1期64卷 2-9页

作者： Amano, Hiroki Ishimoto, Takuya Nakano, Takayoshi TAIYO NIPPON SANSO Corporation Tokyo142-8558 Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Suita565-0871 Japan Anisotropic Design & Additive Manufacturing Research Center Osaka University Suita565-0871 Japan Aluminium Research Center University of Toyama Toyama930-8555 Japan

In metal additive manufacturing, it is possible to control the microstructure and the associated mechanical and chemical properties of metal products over a wide range. For example, in laser powder bed fusion (L-PBF), the laser process parameters are considered critical for the fabrication of functional parts. However, the effect of atmospheric gas on L-PBF has not yet been comprehensively documented. In L-PBF, gas flow is used to remove spatter and fumes, preventing degradation of quality due to laser attenuation and spatter contamination of the fabricated product. Thus, the use of atmospheric gas is inevitable in fabrication via L-PBF. In this review, we focus on the use of atmospheric gas in L-PBF, explain the effects of atmospheric gas on the microstructure and mechanical properties of fabricated products, and describe the importance of selecting the right atmospheric gas. ©2022 The Japan Institute of Light Metals.

关键词： Gases

来源：评论

学校读者我要写书评

暂无评论

Bi-direction and flexible multi-mode morphing wing based on antagonistic SMA wire actuators

引用

Chinese Journal of Aeronautics 2024年第12期37卷 373-387页

作者： Jiannan YANG Yahui ZHANG Xiaojun GU Jinjian LI Pingchu FANG Xinru YANG Jun WANG Jihong ZHU Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China MIIT Lab of Metal Additive Manufacturing and Innovative Design Northwestern Polytechnical UniversityXi’an 710072China National Key Laboratory of Unmanned Aerial Vehicle Technology Northwestern Polytechnical UniversityXi’an 710072China Integrated Research and Development Platform of Unmanned Aerial Vehicle Technology Northwestern Polytechnical UniversityXi’an 710072China

This work evaluates the viability of a cutting-edge flexible wing prototype actuated by Shape Memory Alloy(SMA)wire *** flexible wings have garnered significant interest for their potential to enhance aerodynamic efficiency by mitigating noise and delaying flow *** actuators are particularly advantageous due to their superior power-to-weight ratio and adaptive response,making them increasingly favored in morphing aircraft *** methodology begins with a detailed delineation of the fishbone camber morphing wing rib structure,followed by the construction of a multi-mode morphing wing segment through 3D-printed rib *** testing of the SMA wire actuators’actuation capacity and efficiency was conducted to establish their operational *** experimental analyses focused on the bi-directional and reciprocating morphing performance of the fishbone wing rib,which incorporates SMA wires on the upper and lower *** experiments confirmed the segment’s multi-mode morphing *** assessments have demonstrated that our design substantially improves the Lift-to-Drag ratio(L/D)when compared to conventional rigid ***,two phases of flight tests demonstrated the feasibility of SMA as an aircraft actuator and the validity of flexible wing structures to adjust the aircraft attitude,respectively.

关键词： Morphing aircraft Smart materials Flexible structures 3D-printing Multi-mode morphing

来源：评论

学校读者我要写书评

暂无评论

Development of lunar regolith-based composite for in-situ 3D printing via high-pressure extrusion system

引用

Frontiers of Mechanical Engineering 2023年第2期18卷 253-266页

作者： Hua ZHAO Jihong ZHU Shangqin YUAN Shaoying LI Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

To fully utilize the in-situ resources on the moon to facilitate the establishment of a lunar habitat is significant to realize the long-term residence of mankind on the moon and the deep space exploration in the ***,intensive research works have been conducted to develop types of 3D printing approach to adapt to the extreme environment and utilize the lunar regolith for in-situ ***,the in-situ 3D printing using raw lunar regolith consumes extremely high energy and *** this work,we proposed a cost-effective melting extrusion system for lunar regolith-based composite printing,and engineering thermoplastic powders are employed as a bonding agent for lunar regolith *** high-performance nylon and lunar regolith are uniformly pre-mixed in powder form with different weight *** high-pressure extrusion system is helpful to enhance the interface affinity of polymer binders with lunar regolith as well as maximize the loading ratio of in-situ resources of lunar *** properties such as tensile strength,elastic modulus,and Poisson’s ratio of the printed specimens were evaluated ***,the impact performance was emphasized to improve the resistance of the meteorite impact on the *** maximum tensile strength and impact toughness reach 36.2 MPa and 5.15 kJ/m2,*** melt extrusion for lunar regolith composite can increase the effective loading fraction up to 80 wt.% and relatively easily adapt to extreme conditions for in-situ manufacturing.

关键词： in-situ resource utilization melt extrusion molding lunar regolith-based composites mechanical properties additive manufacturing

来源：评论

学校读者我要写书评

暂无评论

Microstructural control and functional enhancement of light metal materials via metal additive manufacturing

引用

Keikinzoku/Journal of Japan Institute of Light Metals 2022年第6期72卷 327-333页

作者： Ishimoto, Takuya Nakano, Takayoshi Division of Materials & Manufacturing Science Graduate School of Engineering Osaka University Osaka Suita-shi Japan Anisotropic Design & Additive Manufacturing Center Graduate School of Engineering Osaka University Osaka Suita-shi Japan Aluminium Research Center School of Sustainable Design University of Toyama Toyama Toyama-shi Japan

来源：评论

学校读者我要写书评

暂无评论

Variable stiffness design optimization of fiber-reinforced composite laminates with regular and irregular holes considering fiber continuity for additive manufacturing

引用

Chinese Journal of Aeronautics 2025年第3期38卷 334-354页

作者： Yi LIU Zunyi DUAN Chunping ZHOU Yuan SI Chenxi GUAN Yi XIONG Bin XU Jun YAN Jihong ZHU School of Mechanics Civil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China Key Lab for Airborne Hi-performance Electro-magnetic Window RISACJinan 130012China School of System Design and Intelligent Manufacturing Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInternational Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China State IJR Center of Aerospace Design and Additive Manufacturing MIIT Lab of Metal Additive Manufacturing and Innovative DesignNorthwestern Polytechnical UniversityXi’an 710072China

Fiber-reinforced composites are an ideal material for the lightweight design of aerospace structures. Especially in recent years, with the rapid development of composite additive manufacturing technology, the design optimization of variable stiffness of fiber-reinforced composite laminates has attracted widespread attention from scholars and industry. In these aerospace composite structures, numerous cutout panels and shells serve as access points for maintaining electrical, fuel, and hydraulic systems. The traditional fiber-reinforced composite laminate subtractive drilling manufacturing inevitably faces the problems of interlayer delamination, fiber fracture, and burr of the laminate. Continuous fiber additive manufacturing technology offers the potential for integrated design optimization and manufacturing with high structural performance. Considering the integration of design and manufacturability in continuous fiber additive manufacturing, the paper proposes linear and nonlinear filtering strategies based on the Normal Distribution Fiber Optimization (NDFO) material interpolation scheme to overcome the challenge of discrete fiber optimization results, which are difficult to apply directly to continuous fiber additive manufacturing. With minimizing structural compliance as the objective function, the proposed approach provides a strategy to achieve continuity of discrete fiber paths in the variable stiffness design optimization of composite laminates with regular and irregular holes. In the variable stiffness design optimization model, the number of candidate fiber laying angles in the NDFO material interpolation scheme is considered as design variable. The sensitivity information of structural compliance with respect to the number of candidate fiber laying angles is obtained using the analytical sensitivity analysis method. Based on the proposed variable stiffness design optimization method for complex perforated composite laminates, the numerical examples cons

关键词： Variable stiffness composite laminates Discrete material interpolation scheme Normal distribution fiber optimization Discrete fiber continuous filtering strategy additive manufacturing of composite laminates

来源：评论

学校读者我要写书评

暂无评论

design and applications of morphing aircraft and their structures

引用

Frontiers of Mechanical Engineering 2023年第3期18卷 1-20页

作者： Jihong ZHU Jiannan YANG Weihong ZHANG Xiaojun GU Han ZHOU State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an710072China MIIT Laboratory of Metal Additive Manufacturing and Innovative Design NPU-QMUL Joint Research InstituteNorthwestern Polytechnical UniversityXi'an710072China Institute of Intelligence Material and Structure Unmanned System TechnologiesNorthwestern Polytechnical UniversityXi'an 710072China

Morphing aircraft can adaptively regulate their aerodynamic layout to meet the demands of varying flight conditions,improve their aerodynamic efficiency,and reduce their energy *** design and fabrication of high-performance,lightweight,and intelligent morphing structures have become a hot topic in advanced aircraft *** paper discusses morphing aircraft development history,structural characteristics,existing applications,and future ***,some conventional mechanical morphing aircraft are examined with focus on their morphing modes,mechanisms,advantages,and ***,the novel applications of several technologies for morphing unmanned aerial vehicles,including additive manufacturing for fabricating complex morphing structures,lattice technology for reducing structural weight,and multi-mode morphing combined with flexible skins and foldable structures,are summarized and ***,in consideration of the further development of active morphing aircraft,the paper reviews morphing structures driven by smart material actuators,such as shape memory alloy and macro-fiber composites,and analyzes their advantages and ***,the paper discusses multiple challenges,including flexible structures,flexible skins,and control systems,in the design of future morphing ***,the development and application of morphing structures in the aerospace field are discussed to provide a reference for future research and engineering applications.

关键词： morphing aircraft additive manufacturing lattice structure smart material flexible structure flexible skin

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：