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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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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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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 :

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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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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Abstract :

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 :

Joint movements Mechanical stimuli Shearing Tissue engineered cartilage

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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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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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Investigation into factors affecting the mechanical behaviours of a patient-specific vertebral body replacement EI SCIE PubMed Scopus
期刊论文 | 2018 , 232 (4) , 378-387 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
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Abstract :

Most vertebral body implants that are currently designed and produced in batches have difficulty meeting the patient-specific demands. Moreover, several complications, including a low fusion rate, subsidence occurrence, and rod displacement, are associated with these implants. This study aims to investigate the effects of patient-specific geometric and clinical parameters on the biomechanics of a vertebral body replacement. A three-dimensional patient-specific vertebral body replacement model was established as the basic model for parametric studies, including the anatomic design of the endplates, tilting angle, thickness, and dislocation of the vertebral body implant. A finite element analysis was applied to determine the stress distribution of the vertebral body implant when under various loading conditions. The model with an anatomical interfacing design generates 75% less stress concentration compared to a flat design; the peak stress of the model with a tilted angle closely matching the replaced vertebra segment is decreased by 30%; and the thickness close to the cortical bone can offer better bone growth capability and long-term stability. Patient-specific geometrical parameters were found to significantly affect the biomechanics of a vertebral body replacement, and therefore, a design customized especially for the endplates is necessary for better stability and long-term longevity of the prostheses. Regardless of such progress, how to balance the stability of a vertebral body implant and the safety of the peripheral nervous system remains a clinical challenge.

Keyword :

bone graft fusion finite element analysis patient-specific design subsidence Vertebral body replacement

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GB/T 7714 Wang, Ling , Kang, Jianfeng , Shi, Lei et al. Investigation into factors affecting the mechanical behaviours of a patient-specific vertebral body replacement [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE , 2018 , 232 (4) : 378-387 .
MLA Wang, Ling et al. "Investigation into factors affecting the mechanical behaviours of a patient-specific vertebral body replacement" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE 232 . 4 (2018) : 378-387 .
APA Wang, Ling , Kang, Jianfeng , Shi, Lei , Fu, Jun , Li, Dichen , Guo, Zheng et al. Investigation into factors affecting the mechanical behaviours of a patient-specific vertebral body replacement . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE , 2018 , 232 (4) , 378-387 .
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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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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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Modeling nonlinear dynamic properties of dielectric elastomers with various crosslinks, entanglements, and finite deformations EI SCIE Scopus
期刊论文 | 2018 , 123 (8) | JOURNAL OF APPLIED PHYSICS
WoS CC Cited Count: 1
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Abstract :

Subject to an AC voltage, dielectric elastomers (DEs) behave as a nonlinear vibration, implying potential applications as soft dynamical actuators and robots. In this article, by utilizing the Lagrange's equation, a theoretical model is deduced to investigate the dynamic performances of DEs by considering three internal properties, including crosslinks, entanglements, and finite deformations of polymer chains. Numerical calculations are employed to describe the dynamic response, stability, periodicity, and resonance properties of DEs. It is observed that the frequency and nonlinearity of dynamic response are tuned by the internal properties of DEs. Phase paths and Poincare maps are utilized to detect the stability and periodicity of the nonlinear vibrations of DEs, which demonstrate that transitions between aperiodic and quasi-periodic vibrations may occur when the three internal properties vary. The resonance of DEs involving the three internal properties of polymer chains is also investigated. Published by AIP Publishing.

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GB/T 7714 Zhang, Junshi , Chen, Hualing , Li, Dichen . Modeling nonlinear dynamic properties of dielectric elastomers with various crosslinks, entanglements, and finite deformations [J]. | JOURNAL OF APPLIED PHYSICS , 2018 , 123 (8) .
MLA Zhang, Junshi et al. "Modeling nonlinear dynamic properties of dielectric elastomers with various crosslinks, entanglements, and finite deformations" . | JOURNAL OF APPLIED PHYSICS 123 . 8 (2018) .
APA Zhang, Junshi , Chen, Hualing , Li, Dichen . Modeling nonlinear dynamic properties of dielectric elastomers with various crosslinks, entanglements, and finite deformations . | JOURNAL OF APPLIED PHYSICS , 2018 , 123 (8) .
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Tunable actuation behavior of ionic polymer metal composite utilizing carboxylated carbon nanotube-doped Nafion matrix EI SCIE Scopus
期刊论文 | 2018 , 8 (6) , 3090-3094 | RSC ADVANCES
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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In this study, we propose to neutralize the relaxation deformation of Nafion-ionic polymer metal composite (IPMC) by slow anode deformation of Flemion-IPMC caused by carboxyl groups (-COOH). Carboxylated carbon nanotubes (CCNT) as -COOH carriers were doped into a Nafion matrix. By adjusting the doping content from 0 wt% to 10 wt%, an IPMC with constant steady-state deformation has been achieved at a critical CCNT content of 2 wt%. Moreover, the increasing rate of the slow anode deformation with the CCNT content is tunable, which is found to be 2.26 mm s(-1) %(-1).

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GB/T 7714 Ru, Jie , Zhu, Zicai , Wang, Yanjie et al. Tunable actuation behavior of ionic polymer metal composite utilizing carboxylated carbon nanotube-doped Nafion matrix [J]. | RSC ADVANCES , 2018 , 8 (6) : 3090-3094 .
MLA Ru, Jie et al. "Tunable actuation behavior of ionic polymer metal composite utilizing carboxylated carbon nanotube-doped Nafion matrix" . | RSC ADVANCES 8 . 6 (2018) : 3090-3094 .
APA Ru, Jie , Zhu, Zicai , Wang, Yanjie , Chen, Hualing , Li, Dichen . Tunable actuation behavior of ionic polymer metal composite utilizing carboxylated carbon nanotube-doped Nafion matrix . | RSC ADVANCES , 2018 , 8 (6) , 3090-3094 .
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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
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

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 :

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

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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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