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学者姓名:李涤尘

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< Page ,Total 66 >
A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds EI
期刊论文 | 2019 , 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 : 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 (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 , 1-10 .
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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: 3
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Abstract :

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 :

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

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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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Fractions design of irregular particles in suspensions for the fabrication of multiscale ceramic components by gelcasting EI SCIE Scopus
期刊论文 | 2018 , 38 (2) , 671-678 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

A new approach for the preparation of suspensions with a high solid loading and low viscosity by using irregular particles was proposed. These suspensions were prepared for the fabrication of multiscale ceramic components by gelcasting. Based on the Funk-Dinger function and fractal theory, the closest packing theory was applied to optimize the volume fractions of different particles. The maximum solid loading of slurries prepared for gel casting was 62 vol%, and the viscosity at a shear rate of 100 s(-1) was only 0.29 Pa s. By as-prepared suspensions, a decimeter-scale ceramic part with submillimeter features was fabricated successfully by gelcasting, which verify the feasibility of the proposed method.

Keyword :

Rheological properties Irregular particles Solid loadings Gelcasting

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GB/T 7714 Lu, Zhongliang , Miao, Kai , Zhu, Weijun et al. Fractions design of irregular particles in suspensions for the fabrication of multiscale ceramic components by gelcasting [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (2) : 671-678 .
MLA Lu, Zhongliang et al. "Fractions design of irregular particles in suspensions for the fabrication of multiscale ceramic components by gelcasting" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 38 . 2 (2018) : 671-678 .
APA Lu, Zhongliang , Miao, Kai , Zhu, Weijun , Chen, Yi , Xia, Yuanlin , Li, Dichen . Fractions design of irregular particles in suspensions for the fabrication of multiscale ceramic components by gelcasting . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (2) , 671-678 .
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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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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: 1
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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 :

PEEK mechanical strength medical application FTIR FDM cytotoxicity test

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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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The thermal-mechanical behavior of WTaMoNb high-entropy alloy via selective laser melting (SLM): experiment and simulation EI SCIE Scopus
期刊论文 | 2018 , 96 (1-4) , 461-474 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
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The refractory high-entropy alloy (HEA) has excellent heat tolerance and high strength-to-weight ratio. In this study, the thermal-mechanical behavior was examined with the selective laser melting (SLM) process to fabricate a WTaMoNb refractory HEA. The corresponding experiment was conducted to investigate the formation of HEA parts. A heat transfer model and a stress and strain model of the SLM process were built. The finite difference (FD) coupled with the finite element (FE) approach was utilized to simulate the 3D temperature distribution and thermal stress, during a continuous SLM process. The HEA samples with several layers could be deposited at a power p = 400 W and a scanning velocity v = 250 mm s(-1). Warping and cracking deformation occurred over 12 layers due to thermal stress. The thermal-mechanical analysis through simulation demonstrated that the uneven temperature distribution in the entire part caused warping and cracking defects. Subsequently, the process was improved based on the thermal-mechanical analysis and simulated trials. The experiment with the improved process was conducted and verified to be effective for the production of alloys of unlimited layer numbers without cracking defects. The thermal and mechanical models coupled with the FD-FE method could be successfully utilized to simulate and improve the entire SLM process.

Keyword :

Thermal-mechanical behavior High-entropy alloy (HEA) Numerical simulation Selective laser melting(SLM)

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GB/T 7714 Zhang, Hang , Xu, Wang , Xu, Yunjing et al. The thermal-mechanical behavior of WTaMoNb high-entropy alloy via selective laser melting (SLM): experiment and simulation [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 96 (1-4) : 461-474 .
MLA Zhang, Hang et al. "The thermal-mechanical behavior of WTaMoNb high-entropy alloy via selective laser melting (SLM): experiment and simulation" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 96 . 1-4 (2018) : 461-474 .
APA Zhang, Hang , Xu, Wang , Xu, Yunjing , Lu, Zhongliang , Li, Dichen . The thermal-mechanical behavior of WTaMoNb high-entropy alloy via selective laser melting (SLM): experiment and simulation . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 96 (1-4) , 461-474 .
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Biomechanical Optimization of Elastic Modulus Distribution in Porous Femoral Stem for Artificial Hip Joints EI SCIE Scopus CSCD
期刊论文 | 2018 , 15 (4) , 693-702 | JOURNAL OF BIONIC ENGINEERING
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Abstract :

Long-term loosening is the major cause of failure of arthroplasty. One of the major causes is stress shielding, initiated by the large stiffness difference between prosthesis and bone tissue. Therefore, prosthesis with reduced stiffness properties to match those of the bone tissue may be able to minimize such a problem. Design with porous structure is believed to reduce the stiffness of the prosthesis, however at the cost of decreased strength. In this study, a patient-specific bone-implant finite element model was developed for contact mechanics study of hip joint, and algorithms were developed to adjust the elastic modulus of elements in certain regions of the femoral stem, until optimal properties were achieved according to the pre-defined criterions of the strength and stability of the system. The global safety factor of the optimized femoral stem was 11.3, and 26.4% of elements were designed as solid. The bone volume with density loss was reduced by 40% compared to the solid stem. The methodology developed in this study provides a universal method to design a patient-specific prosthesis with a gradient modulus distribution for the purposes of minimizing the stress shielding effect and extending the lifespan of the implant.

Keyword :

stress shielding porous prosthesis elastic modulus distribution finite element analysis femoral stem

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GB/T 7714 Sun, Changning , Wang, Ling , Kang, Jianfeng et al. Biomechanical Optimization of Elastic Modulus Distribution in Porous Femoral Stem for Artificial Hip Joints [J]. | JOURNAL OF BIONIC ENGINEERING , 2018 , 15 (4) : 693-702 .
MLA Sun, Changning et al. "Biomechanical Optimization of Elastic Modulus Distribution in Porous Femoral Stem for Artificial Hip Joints" . | JOURNAL OF BIONIC ENGINEERING 15 . 4 (2018) : 693-702 .
APA Sun, Changning , Wang, Ling , Kang, Jianfeng , Li, Dichen , Jin, Zhongmin . Biomechanical Optimization of Elastic Modulus Distribution in Porous Femoral Stem for Artificial Hip Joints . | JOURNAL OF BIONIC ENGINEERING , 2018 , 15 (4) , 693-702 .
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Functional testing on engineered cartilage to identify the role played by shearing EI SCIE PubMed Scopus
期刊论文 | 2018 , 51 , 17-23 | MEDICAL ENGINEERING & PHYSICS
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Compressive loading is crucial for tissue regeneration in cartilage: however, the role played by shearing induced from translational or rotational motion of the knee joint has yet to be identified. This study aims at investigating the effects of in vivo like dynamic load-compression integrated with shearing on tissue regeneration, particularly to identify the role played by shearing induced from rotational motion. Tissue samples fabricated from a calcium alginate hydrogel embedded with chondrocytes were subjected to a dynamic tissue culture. Three culturing regimes were included: a static culture control (CON), compression combined with shearing induced from translational motion (CS), and compression combined with shearing induced from both translational and rotational motion (CSR). The results indicate that the CS group has a significantly larger chondrocyte proliferation rate (p <.01), and that the CSR group has no advantages over the CS group. However, the CSR group was found to have a marked influence on the matrix synthesis compared to that of the CS group (p <.01). It can be concluded that shearing from individual joint motions offers a different contribution to the chondrocyte proliferation, matrix synthesis, and phenotype maintenance, and better insight into these individual roles will be necessary for determining the efficacy of in vivo/vitro cartilageous tissue functionalization. (C) 2017 Published by Elsevier Ltd on behalf of IPEM.

Keyword :

Tissue engineered cartilage Joint movements Mechanical stimuli Shearing

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GB/T 7714 Wang, Ling , Shen, Hao , Nie, Jichang et al. Functional testing on engineered cartilage to identify the role played by shearing [J]. | MEDICAL ENGINEERING & PHYSICS , 2018 , 51 : 17-23 .
MLA Wang, Ling et al. "Functional testing on engineered cartilage to identify the role played by shearing" . | MEDICAL ENGINEERING & PHYSICS 51 (2018) : 17-23 .
APA Wang, Ling , Shen, Hao , Nie, Jichang , Li, Dichen , Fan, Hongbin , Jin, Zhongmin et al. Functional testing on engineered cartilage to identify the role played by shearing . | MEDICAL ENGINEERING & PHYSICS , 2018 , 51 , 17-23 .
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Can the sheep model fully represent the human model for the functional evaluation of cervical interbody fusion cages? EI
期刊论文 | 2018 | Biomechanics and Modeling in Mechanobiology
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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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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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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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