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学者姓名:李涤尘

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< Page ,Total 68 >
A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds EI SCIE
期刊论文 | 2019 , 132 , 1-10 | International Journal of Heat and Mass Transfer
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Abstract :

The effective thermal conductivity (ETC) of metal powder is a basic physical property that has an important role in industrial design for metallurgical, energy, chemical, and other types of application. To obtain this information, a numerical model based on the coupled discrete element-finite difference (DE-FD) method is proposed to precisely and efficiently predict the ETC of metal powders. A random packaged aluminum powder unit influenced by the effects of gravity is piled up concerning the particle size distribution of the real powder. Moreover, a sandwich structure model is proposed to simulate the thermal dynamic behavior during directional heat transfer. Based on the amount of heat passing through the system, the effective thermal conductivity was precisely calculated in an indirect way and the results of the simulation were consistent with corresponding experimental results. Relative error was within ±5%. Thus, the proposed numerical model may be useful in predicting the ETC of the different powder beds filed using various types of interstitial gas media within a wide range of temperatures. © 2018 Elsevier Ltd

Keyword :

Aluminum powders Coupling modeling Effective thermal conductivity Powder bed Relative errors Thermal dynamics

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GB/T 7714 Zhang, Hang , Zhao, Yizhen , Wang, Fu et al. A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds [J]. | International Journal of Heat and Mass Transfer , 2019 , 132 : 1-10 .
MLA Zhang, Hang et al. "A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds" . | International Journal of Heat and Mass Transfer 132 (2019) : 1-10 .
APA Zhang, Hang , Zhao, Yizhen , Wang, Fu , Li, Dichen . A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds . | International Journal of Heat and Mass Transfer , 2019 , 132 , 1-10 .
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Biphasic osteochondral scaffold fabrication using multi-material mask projection stereolithography EI Scopus SCIE
期刊论文 | 2019 , 25 (2) , 277-288 | Rapid Prototyping Journal
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Abstract :

Purpose: This study aims to develop a multi-material stereolithography (MMSL) technique to directly fabricate a biphasic osteochondral scaffold. Design/methodology/approach: A bespoke prototype MMSL system was developed based on a bottom-up mask projection approach. The system was controlled by a multi-material fabrication algorithm with minimum number of switching cycles during fabrication. A variable-power light source was used to fabricate materials with significantly different curing characteristics. The light-curable poly(ethylene glycol) diacrylate (PEGDA) hydrogel and beta-tricalcium phosphate (β-TCP) ceramic suspension were used for fabricating the biphasic osteochondral scaffold. Findings: The bonding strength of the multi-material interface is shown to be mainly affected by the type of photopolymer, rather than the switching of the materials in MMSL. Lighting power densities of 2.64 and 14.98 mW/cm2 were used for curing the PEGDA hydrogel and the ß-TCP ceramic suspension, respectively. A biphasic osteochondral scaffold with complex interface was successfully fabricated. Originality/value: This study proposes a potential technical method (MMSL) for manufacturing a complex biphasic osteochondral scaffold composing a PEGDA hydrogel/ß-TCP ceramic composite in a time-efficient and precise manner. The designed bone-cartilage scaffold interface and the surface of the cartilage scaffold can be precisely manufactured. © 2018, Emerald Publishing Limited.

Keyword :

Ceramic suspensions Mask projection Multi materials Osteochondral Variable power

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GB/T 7714 Wu, Xiangquan , Lian, Qin , Li, Dichen et al. Biphasic osteochondral scaffold fabrication using multi-material mask projection stereolithography [J]. | Rapid Prototyping Journal , 2019 , 25 (2) : 277-288 .
MLA Wu, Xiangquan et al. "Biphasic osteochondral scaffold fabrication using multi-material mask projection stereolithography" . | Rapid Prototyping Journal 25 . 2 (2019) : 277-288 .
APA Wu, Xiangquan , Lian, Qin , Li, Dichen , Jin, Zhongmin . Biphasic osteochondral scaffold fabrication using multi-material mask projection stereolithography . | Rapid Prototyping Journal , 2019 , 25 (2) , 277-288 .
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The Development Frontier of 3D Printing - the Brain-like Tissue Printing EI CSCD Scopus PKU
期刊论文 | 2018 , 54 (1) , 197-204 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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Abstract :

Lacking knowledge of the complex structure of brain tissue has limited the progress of the brain disease study. Due to the difficulty of reserving human brain tissue in-vitro and the related ethical issues, the functional and pharmacological research on brain disease are majorly dependent on animal tests. However, the species difference can lead to failure of the pharmacological application in medical clinic. Therefore, brain-like tissue constructed via tissue engineering methodology in-vitro might be a good way out. The complex macro-/micr-structure of natural brain tissue has been reviewed, and the significance on construction of brain-like tissue by using 3D printing technology and the associated challenges are emphasized. Moreover, based on a thorough review of current status of brain-like tissue reconstruction in-vitro including the methodology and limitation, a new concept and methodology of manufacturing system by integrating the 3D printing process and culturing process has been developed. This integrated system can stimulate cell growth and tissue functionalization compared to the traditional methodologies. © 2018 Journal of Mechanical Engineering.

Keyword :

3-D printing 3D printing process Complex structure Engineering methodology Functionalizations Integrated systems Pharmacological research Tissue reconstruction

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GB/T 7714 Wang, Ling , Fang, Ao , Shen, Hao et al. The Development Frontier of 3D Printing - the Brain-like Tissue Printing [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (1) : 197-204 .
MLA Wang, Ling et al. "The Development Frontier of 3D Printing - the Brain-like Tissue Printing" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 54 . 1 (2018) : 197-204 .
APA Wang, Ling , Fang, Ao , Shen, Hao , Li, Dichen , Zhang, Kun , Hao, Zhiyan et al. The Development Frontier of 3D Printing - the Brain-like Tissue Printing . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (1) , 197-204 .
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多材料面曝光增材制造方法与加工工艺研究
期刊论文 | 2018 , (1) , 47-50,60 | 电加工与模具
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Abstract :

零件的多材料组成可改变其机械性能,并增加其他附属功能.通过搭建一种分区旋转槽多材料面曝光增材制造系统,验证了多材料光固化成形工艺,完成了含有两种树脂材料的复杂结构零件的加工.分析了零件的加工质量和加工精度,并进行了多材料界面结合的抗拉和抗剪性能测试.结果表明:所加工的多材料界面在拉应力和剪应力的作用下结合良好.

Keyword :

面曝光 多材料 旋转槽 增材制造

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GB/T 7714 武向权 , 连芩 , 何晓宁 et al. 多材料面曝光增材制造方法与加工工艺研究 [J]. | 电加工与模具 , 2018 , (1) : 47-50,60 .
MLA 武向权 et al. "多材料面曝光增材制造方法与加工工艺研究" . | 电加工与模具 1 (2018) : 47-50,60 .
APA 武向权 , 连芩 , 何晓宁 , 孟佳丽 , 李涤尘 , 靳忠民 . 多材料面曝光增材制造方法与加工工艺研究 . | 电加工与模具 , 2018 , (1) , 47-50,60 .
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Design, Fabrication and Performance of a Flexible Minimally Invasive Surgery Manipulator Integrated with Soft Actuation and Variable Stiffness EI
期刊论文 | 2018 , 54 (17) , 53-61 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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Abstract :

Conventional surgical manipulators are in straight-bar shape and made of rigid materials mostly, which fail to adapt to the minimally invasive surgical operation using natural orifices. Therefore, a flexible surgical manipulator, with multi-DOF deformation and variable stiffness abilities via pneumatic artificial muscle actuation and fiber jamming techniques, is presented. The integrated manufacturing process of the manipulator unit is developed. An experimental test system is set up to obtain the nonlinear relationships between the bending deformation, output force of the pneumatic artificial muscle actuator and the air pressure. The relationships between anti-bending ability of a single unit and negative pressure, fiber density and fiber arrangement are further studied. The optimized design scheme is obtained. Within a complex system, the multi-DOF deformation in obstacle-avoiding and the stiffness tunability of the manipulator are demonstrated. © 2018 Journal of Mechanical Engineering.

Keyword :

Integrated manufacturing Minimally invasive surgery Minimally invasive surgical Negative pressures Non-linear relationships Pneumatic artificial muscle Surgical manipulators Variable stiffness

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GB/T 7714 Chen, Yuyu , Liu, Lei , Li, Bo et al. Design, Fabrication and Performance of a Flexible Minimally Invasive Surgery Manipulator Integrated with Soft Actuation and Variable Stiffness [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) : 53-61 .
MLA Chen, Yuyu et al. "Design, Fabrication and Performance of a Flexible Minimally Invasive Surgery Manipulator Integrated with Soft Actuation and Variable Stiffness" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 54 . 17 (2018) : 53-61 .
APA Chen, Yuyu , Liu, Lei , Li, Bo , Wei, Chao , Wang, Shuxin , Li, Dichen . Design, Fabrication and Performance of a Flexible Minimally Invasive Surgery Manipulator Integrated with Soft Actuation and Variable Stiffness . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) , 53-61 .
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Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure EI
期刊论文 | 2018 , 54 (17) , 46-52 | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
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Abstract :

In view of the future development requirements of the minimally invasive surgical arm, a method using the principle of negative pressure to enhance the interactions between discrete structures is proposed to adjust the stiffness of flexible surgical arms. A pneumatic multilayered fiber braid structure is specially designed and fabricated, cladded on the outer surface of the tube arm. For this structure, negative pressure can be obtained in the interlayer of the sealed fiber filaments by a vacuum pump, and the extrusion pressure and friction force between them increase consequently, leading to a stiffness enhancement of the arm. A semi-analytical method for quantitatively evaluate the flexural stiffness of the large-deformed arm is then studied. Finally, the experimental investigations are performed, focused on the influences of some key parameters on the stiffness adjustment effect of the arm, such as vacuum degree, the size of fiber filaments, the thickness of the packaging film, the cross section of the fiber layer, etc. © 2018 Journal of Mechanical Engineering.

Keyword :

Discrete structure Experimental investigations Flexible surgical arm Minimally invasive surgical Negative pressures Semi-analytical methods Stiffness adjustments Stiffness enhancement

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GB/T 7714 Xu, Xiaoliang , Wang, Yongquan , Wen, Kun et al. Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure [J]. | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) : 46-52 .
MLA Xu, Xiaoliang et al. "Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure" . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 54 . 17 (2018) : 46-52 .
APA Xu, Xiaoliang , Wang, Yongquan , Wen, Kun , Chen, Hualing , Wang, Shuxin , Li, Dichen . Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure . | Jixie Gongcheng Xuebao/Journal of Mechanical Engineering , 2018 , 54 (17) , 46-52 .
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Can the sheep model fully represent the human model for the functional evaluation of cervical interbody fusion cages? EI PubMed
期刊论文 | 2018 | Biomechanics and Modeling in Mechanobiology
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Abstract :

Sheep model is the most favourable choice for animal study for functional evaluation of the cervical fusion prostheses before clinical application; however, significantly large differences between sheep and human existed in terms of morphological characteristics and daily-activity motions. Questions should be raised as whether the differences between the two species have influence on the reliability of sheep model. Finite element models (FEM) of the cervical spinal system were built to characterize the differences between the two species with respect to the range of motion (ROM) and biomechanical behaviour, and experimental cadaver tests on both species were employed for validation purposes. Results indicate that sheep model represents the worst-case scenario of the human model with exaggerated stresses (up to 3 times more) and ROM (up to 10 times more). Moreover, sheep model is very sensitive to the variation of prostheses design, whilst human model does not, which denotes that the sheep model provides a rather amplified effect of a certain design for its biomechanical performance. Therefore, caution needs to be taken when sheep models were used as the animal model for functional evaluation over various design, and the FEM built in this study can be employed as an effective methodology for performance evaluation of cage prostheses of cervical spine. © 2018, The Author(s).

Keyword :

Animal studies Biomechanical performance Functional evaluation Interbody fusion cages Morphological characteristic Performance evaluations Range of motions Spinal disc

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GB/T 7714 Wang, Ling , Wang, Yingying , Shi, Lei et al. Can the sheep model fully represent the human model for the functional evaluation of cervical interbody fusion cages? [J]. | Biomechanics and Modeling in Mechanobiology , 2018 .
MLA Wang, Ling et al. "Can the sheep model fully represent the human model for the functional evaluation of cervical interbody fusion cages?" . | Biomechanics and Modeling in Mechanobiology (2018) .
APA Wang, Ling , Wang, Yingying , Shi, Lei , Liu, Peng , Kang, Jianfeng , He, Jiankang et al. Can the sheep model fully represent the human model for the functional evaluation of cervical interbody fusion cages? . | Biomechanics and Modeling in Mechanobiology , 2018 .
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Preliminary Investigation of Poly-Ether-Ether-Ketone Based on Fused Deposition Modeling for Medical Applications EI SCIE PubMed Scopus
期刊论文 | 2018 , 11 (2) | MATERIALS
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

Poly-ether-ether-ketone (PEEK) fabricated by fused deposition modeling for medical applications was evaluated in terms of mechanical strength and in vitro cytotoxicity in this study. Orthogonal experiments were firstly designed to investigate the significant factors on tensile strength. Nozzle temperature, platform temperature, and the filament diameter were tightly controlled for improved mechanical strength performance. These sensitive parameters affected the interlayer bonding and solid condition in the samples. Fourier transform infrared (FTIR) spectrometry analysis was secondly conducted to compare the functional groups in PEEK granules, filaments, and printed parts. In vitro cytotoxicity test was carried out at last, and no toxic substances were introduced during the printing process.

Keyword :

cytotoxicity test FDM FTIR mechanical strength medical application PEEK

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GB/T 7714 Zhao, Feng , Li, Dichen , Jin, Zhongmin . Preliminary Investigation of Poly-Ether-Ether-Ketone Based on Fused Deposition Modeling for Medical Applications [J]. | MATERIALS , 2018 , 11 (2) .
MLA Zhao, Feng et al. "Preliminary Investigation of Poly-Ether-Ether-Ketone Based on Fused Deposition Modeling for Medical Applications" . | MATERIALS 11 . 2 (2018) .
APA Zhao, Feng , Li, Dichen , Jin, Zhongmin . Preliminary Investigation of Poly-Ether-Ether-Ketone Based on Fused Deposition Modeling for Medical Applications . | MATERIALS , 2018 , 11 (2) .
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Advanced Material Strategies for Next-Generation Additive Manufacturing EI SCIE PubMed Scopus
期刊论文 | 2018 , 11 (1) | MATERIALS
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Additive manufacturing (AM) has drawn tremendous attention in various fields. In recent years, great efforts have been made to develop novel additive manufacturing processes such as micro-/nano-scale 3D printing, bioprinting, and 4D printing for the fabrication of complex 3D structures with high resolution, living components, and multimaterials. The development of advanced functional materials is important for the implementation of these novel additive manufacturing processes. Here, a state-of-the-art review on advanced material strategies for novel additive manufacturing processes is provided, mainly including conductive materials, biomaterials, and smart materials. The advantages, limitations, and future perspectives of these materials for additive manufacturing are discussed. It is believed that the innovations of material strategies in parallel with the evolution of additive manufacturing processes will provide numerous possibilities for the fabrication of complex smart constructs with multiple functions, which will significantly widen the application fields of next-generation additive manufacturing.

Keyword :

4D printing additive manufacturing biomaterials bioprinting conductive materials micro-/nano-scale 3D printing smart materials

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GB/T 7714 Chang, Jinke , He, Jiankang , Mao, Mao et al. Advanced Material Strategies for Next-Generation Additive Manufacturing [J]. | MATERIALS , 2018 , 11 (1) .
MLA Chang, Jinke et al. "Advanced Material Strategies for Next-Generation Additive Manufacturing" . | MATERIALS 11 . 1 (2018) .
APA Chang, Jinke , He, Jiankang , Mao, Mao , Zhou, Wenxing , Lei, Qi , Li, Xiao et al. Advanced Material Strategies for Next-Generation Additive Manufacturing . | MATERIALS , 2018 , 11 (1) .
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A moisture and electric coupling stimulated ionic polymer-metal composite actuator with controllable deformation behavior EI SCIE Scopus
期刊论文 | 2018 , 27 (2) | SMART MATERIALS AND STRUCTURES
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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Abstract :

Ionic polymer-metal composite (IPMC) actuator can generate large and rapid deformation based on ion migration under a relatively low driving voltage. Under full hydrated conditions, the deformation is always prone to relaxation. At room humidity conditions, the deformation increases substantially at the early stage of actuation, and then decreases gradually. Generally, most researchers considered that the change of water content or relative humidity mainly leads to the deformation instabilities, which severely limits the practical applications of IPMC. In this Letter, a novel actuation mode is proposed to control the deformation behavior of IPMC by employing moisture as an independent or collaborative incentive source together with the electric field. The deformation response is continuously measured under electric field, electric field-moisture coupling stimulus and moisture stimulus. The result shows that moisture can be a favorable driving factor for IPMC actuation. Such an electric field-moisture coupling stimulus can avoid the occurrence of deformation instabilities and guarantee a superior controllable deformation in IPMC actuation. This research provides a new method to obtain stable and large deformation of IPMC, which is of great significance for the guidance of material design and application for IPMC and IPMC-type iEAP materials.

Keyword :

electric field-moisture coupling stimulus moisture-responsive deformation moisture stimulus ionic electroactive polymer ionic polymer-metal composite coupling deformation

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GB/T 7714 Ru, Jie , Zhu, Zicai , Wang, Yanjie et al. A moisture and electric coupling stimulated ionic polymer-metal composite actuator with controllable deformation behavior [J]. | SMART MATERIALS AND STRUCTURES , 2018 , 27 (2) .
MLA Ru, Jie et al. "A moisture and electric coupling stimulated ionic polymer-metal composite actuator with controllable deformation behavior" . | SMART MATERIALS AND STRUCTURES 27 . 2 (2018) .
APA Ru, Jie , Zhu, Zicai , Wang, Yanjie , Chen, Hualing , Bian, Changsheng , Luo, Bin et al. A moisture and electric coupling stimulated ionic polymer-metal composite actuator with controllable deformation behavior . | SMART MATERIALS AND STRUCTURES , 2018 , 27 (2) .
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