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学者姓名:卢秉恒

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< Page ,Total 69 >
Microstructure Evolution and Mechanical Behavior of 2219 Aluminum Alloys Additively Fabricated by the Cold Metal Transfer Process SCIE PubMed Scopus
期刊论文 | 2018 , 11 (5) | MATERIALS
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

In this research, four different welding arc modes including conventional cold metal transfer (CMT), CMT-Pulse (CMT-P), CMT-Advanced (CMT-ADV), and CMT pulse advanced (CMT-PADV) were used to deposit 2219-Al wire. The effects of different arc modes on porosity, pore size distribution, microstructure evolution, and mechanical properties were thoroughly investigated. The statistical analysis of the porosity and its size distribution indicated that the CMT-PADV process gave the smallest pore area percentage and pore aspect ratio, and had almost no larger pores. The results from optical microscopy, scanning electron microscopy, and fractographic morphology proved that uniform and fine equiaxed grains, evenly distributed Al2Cu second phase particles were formed during the CMT-PADV process. Furthermore, the X-ray diffraction test ascertained that the CMT-PADV sample had the smallest lattice parameter and the highest solute Cu content. Besides, the tensile strength could reach 283 MPa, the data scattering was the smallest, and the strength scattering of the sample in the horizontal direction was the shortest. In addition, the strength properties were nearly isotropic, with only 5 MPa difference in the vertical and horizontal directions. The above mentioned results indicated that the mechanical properties of 2219 aluminum alloy was improved using the CMT-PADV arc mode.

Keyword :

porosity additive manufacturing microstructure cold metal transfer 2219-Aluminum mechanical property

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GB/T 7714 Fang, Xuewei , Zhang, Lijuan , Li, Hui et al. Microstructure Evolution and Mechanical Behavior of 2219 Aluminum Alloys Additively Fabricated by the Cold Metal Transfer Process [J]. | MATERIALS , 2018 , 11 (5) .
MLA Fang, Xuewei et al. "Microstructure Evolution and Mechanical Behavior of 2219 Aluminum Alloys Additively Fabricated by the Cold Metal Transfer Process" . | MATERIALS 11 . 5 (2018) .
APA Fang, Xuewei , Zhang, Lijuan , Li, Hui , Li, Chaolong , Huang, Ke , Lu, Bingheng . Microstructure Evolution and Mechanical Behavior of 2219 Aluminum Alloys Additively Fabricated by the Cold Metal Transfer Process . | MATERIALS , 2018 , 11 (5) .
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FUNDAMENTAL STUDY OF FUSED-COATING BASED METAL ADDITIVE MANUFACTURING EI CPCI-S Scopus
会议论文 | 2017 | 12th ASME International Manufacturing Science and Engineering Conference
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Abstract :

Fused-coating based metal additive manufacturing (FCAM) is a newly established direct metal forming process. This method is characterized by deposition metal materials in a crucible and under the driving pressure the molten metal is extruded out from a special designed nozzle. Hence, dense metal parts with different kind of materials can be built on the moving substrate layer by layer. It provides a method to fabricate metal components with lower costs, clean and cheap materials compared with other AM processes. To study the feasibility of this new AM methodology, an experimental system with a molten metal stream generator, a fused-coating nozzle, a process monitor unit, an inert atmosphere protection unit and a temperature measurement unit has been established. In order to determine the proper parameters in the building process, a metal fused-coating heat transfer model analysis and experimental study is performed by using Sn63-37Pb alloy in building three-dimensional components. The process parameters that may affect fabrication are molten and substrate temperature, layer thickness, the substrate-speed, the temperature of substrate, the distance between the nozzle and substrate and the pressure. Microscopy images were used to investigate the metallurgical bonding between layers. The influence of different parameters on the layer thickness and width was studied quantitatively. At last, the optimal parameter was used to fabricate complex metal parts to demonstrate the feasibility of this new technology compared with other AM methods.

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GB/T 7714 Fang, Xuewei , Du, Jun , Wei, Zhengying et al. FUNDAMENTAL STUDY OF FUSED-COATING BASED METAL ADDITIVE MANUFACTURING [C] . 2017 .
MLA Fang, Xuewei et al. "FUNDAMENTAL STUDY OF FUSED-COATING BASED METAL ADDITIVE MANUFACTURING" . (2017) .
APA Fang, Xuewei , Du, Jun , Wei, Zhengying , Wang, Xin , He, Pengfei , Wang, Bowen et al. FUNDAMENTAL STUDY OF FUSED-COATING BASED METAL ADDITIVE MANUFACTURING . (2017) .
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Optimized design of sandwich panels for integral thermal protection systems EI SCIE Scopus
期刊论文 | 2017 , 55 (1) , 13-23 | STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION | IF: 2.876
WoS CC Cited Count: 1
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Abstract :

This paper proposes a new ITPS panel with special corrugated-core webs which are designed with cutouts for weight saving. The structural design problem was formulated with mass per unit area of the ITPS as the objective function and some functional requirements as constraints. We developed the optimizer fulfilling both thermal and structural functions for minimal areal density. The optimization problem was solved by interpolating the residual error of response surface approximation (RSA) with Radial Basis Function (RBF) to establish the improved RSA (IRSA). The 400 preliminary design points were obtained using Latin Hypercube Sampling method. The quadratic polynomial RSA of the ITPS sandwich panel performance was generated by the least squares method (LSM) based on finite element results and IRSA was used to optimize the constraints. Transient heat transfer, stress and buckling analyses were conducted using finite element method (FEM). Finally, a new ITPS panel with optimal dimensions was obtained. The optimization results show that the areal density of the new ITPS panel decreases by 26.27 % compared with the previous research, which proves the potential of this new design optimization method for the future spacecraft vehicles.

Keyword :

Corrugated-core sandwich structure Optimized design Finite element method (FEM) Integral thermal protection system (ITPS) Improved response surface approximation (IRSA)

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GB/T 7714 Fang, Xuewei , Chen, Jian , Lu, Bingheng et al. Optimized design of sandwich panels for integral thermal protection systems [J]. | STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION , 2017 , 55 (1) : 13-23 .
MLA Fang, Xuewei et al. "Optimized design of sandwich panels for integral thermal protection systems" . | STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION 55 . 1 (2017) : 13-23 .
APA Fang, Xuewei , Chen, Jian , Lu, Bingheng , Wang, Yiqing , Guo, Shanguang , Feng, Zhengyi et al. Optimized design of sandwich panels for integral thermal protection systems . | STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION , 2017 , 55 (1) , 13-23 .
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Improvement and Experimental Research on the Recovery Stress-Temperature Model of NiTi Shape Memory Alloys EI SCIE Scopus CSCD PKU
期刊论文 | 2017 , 46 (1) , 117-121 | RARE METAL MATERIALS AND ENGINEERING | IF: 0.29
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Abstract :

To eliminate the prediction errors of the recovery stress model of NiTi SMAs caused by the incomplete reverse martensitic transformation, an improved prediction model of recovery stress was developed based on the one-dimensional constitutive behavior model proposed by Brinson for shape memory alloys (SMAs). This model regarded the martensitic recovery factor as an internal variable and took the stress and temperature into account as influencing factors to martensitic content of SMAs. The curve of recovery stress of NiTi SMAs with different initial strains versus temperature was measured by experiments. Compared with the experimental results, the computation result shows that the model has certain accuracy in calculating the recovery stress-temperature curve.

Keyword :

recovery stress martensitic recovery factor model improvement shape memory alloys

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GB/T 7714 Wang Yiqing , Zhang Teng , Guo Shanguang et al. Improvement and Experimental Research on the Recovery Stress-Temperature Model of NiTi Shape Memory Alloys [J]. | RARE METAL MATERIALS AND ENGINEERING , 2017 , 46 (1) : 117-121 .
MLA Wang Yiqing et al. "Improvement and Experimental Research on the Recovery Stress-Temperature Model of NiTi Shape Memory Alloys" . | RARE METAL MATERIALS AND ENGINEERING 46 . 1 (2017) : 117-121 .
APA Wang Yiqing , Zhang Teng , Guo Shanguang , Chen Jian , Liu Hongzhong , Lu Bingheng et al. Improvement and Experimental Research on the Recovery Stress-Temperature Model of NiTi Shape Memory Alloys . | RARE METAL MATERIALS AND ENGINEERING , 2017 , 46 (1) , 117-121 .
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Improved triboelectrification effect by bendable and slidable fish-scale-like microstructures EI SCIE Scopus
期刊论文 | 2017 , 40 , 646-654 | NANO ENERGY | IF: 13.12
WoS CC Cited Count: 2
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Abstract :

Improving the triboelectrification effect between tribo-materials is fundamentally important for advancing the booming community of triboelectric nanogenerators (TENGs) and self-powered sensors. Microstructures played key roles in improving the triboelectrification effect, however, the uprightness of commonly used microstructures always limited the triboelectrification to interfaces between the tops of microstructures and opposite tribo-films during vertical contact/separation processes. In this study, bendable and slidable fish-scale-like microstructures were developed to surpass the limitations by extending the triboelectric interfaces from their tops to their sidewalls, taking the advantages of bending and sliding movements. Based on the fish-scale-like microstructures, the as-prepared TENGs delivered open-circuit voltages reaching up to 470 V and a short-circuit current density of 45 mu A/cm(2). These values were two-fold higher than those obtained with vertical microstructures under the same testing conditions. The as-assembled self-powered pressure sensors based on fish-scale-like microstructures delivered linear measurement ranges reaching up to 42 kPa, low detection limit of 10 mPa, high sensitivity of 1.03 mV/Pa, and ultrafast response of 0.1 ms. These features were significantly enhanced when compared to those of vertical microstructures. More importantly, we also developed a straightforward and low-cost duplication method for fabricating the fish-scale-like microstructures, which are easily achievable for fabricating the high-performance TENGs or self-powered pressure sensors.

Keyword :

Fish-scale-like microstructures Self-powered sensors Triboelectric nanogenerator Bendable and slidable

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GB/T 7714 Li, Xiangming , Xu, Chuan , Wang, Chao et al. Improved triboelectrification effect by bendable and slidable fish-scale-like microstructures [J]. | NANO ENERGY , 2017 , 40 : 646-654 .
MLA Li, Xiangming et al. "Improved triboelectrification effect by bendable and slidable fish-scale-like microstructures" . | NANO ENERGY 40 (2017) : 646-654 .
APA Li, Xiangming , Xu, Chuan , Wang, Chao , Shao, Jinyou , Chen, Xiaoliang , Wang, Chunhui et al. Improved triboelectrification effect by bendable and slidable fish-scale-like microstructures . | NANO ENERGY , 2017 , 40 , 646-654 .
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Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives SCIE Scopus
期刊论文 | 2017 , 4 (9) | ADVANCED MATERIALS INTERFACES | IF: 4.834
WoS CC Cited Count: 1
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Abstract :

Bioinspired mushroom-shaped micropillar recently has attracted considerable interest from researchers on adhesion-functionalized artificial surface due to its prominent dry adhesive property. Understanding the interface behavior and further exploring the physical mechanism are of significance for properly designing the structure dimension with enhanced performance. However, the friction contribution to such type of adhesive structures is mostly overlooked in previous investigations. In this paper, by revisiting the detachment behavior associated with the calculation of the critical dynamic crack size making the contact interface destabilized, it is demonstrated that the friction force does work in the detachment process of mushroom-shaped micropillars. The calculated maximum pull-off forces are in good agreement with experimental results and the friction force contribution can reach up to about 41% of the total adhesive force when the tip diameter is 2.6 times the diameter of the supporting pillar. The present model provides a deeper insight into the mushroom-shaped dry adhesives and may be helpful in future bioinspired dry adhesives designs.

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GB/T 7714 Hu, Hong , Tian, Hongmiao , Shao, Jinyou et al. Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives [J]. | ADVANCED MATERIALS INTERFACES , 2017 , 4 (9) .
MLA Hu, Hong et al. "Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives" . | ADVANCED MATERIALS INTERFACES 4 . 9 (2017) .
APA Hu, Hong , Tian, Hongmiao , Shao, Jinyou , Wang, Yue , Li, Xiangming , Tian, Yu et al. Friction Contribution to Bioinspired Mushroom-Shaped Dry Adhesives . | ADVANCED MATERIALS INTERFACES , 2017 , 4 (9) .
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A Numerical Analysis on the Metal Droplets Impacting and Spreading out on the Substrate EI SCIE Scopus CSCD PKU
期刊论文 | 2017 , 46 (4) , 893-898 | RARE METAL MATERIALS AND ENGINEERING | IF: 0.29
WoS CC Cited Count: 1
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Abstract :

The quality of 3D printing parts obtained by droplets deposition depends strongly on the mechanism of the interaction between the molten metal droplets and the substrate to be covered. The effects of various parameters such as impact velocity, substrate temperature, droplet diameters, specific heat, and thermal conductivity on the maximum spread factor during impacting and spreading with solidification of a molten droplet onto an aluminum surface under different parameters were studied. The free surface of the droplet was tracked by the volume-of-fluid (VOF) method. The simulation model was based on the N-S equations and the energy equations which included convection and phase change. These equations were coupled with the Level Set function to track the interface between molten particles and surrounding air. The maximum spread factors are obtained and agreement with the experimental data available in the literature.

Keyword :

metal droplets impact velocity substrate temperature impacting and spreading

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GB/T 7714 Li Suli , Wei Zhengying , Du Jun et al. A Numerical Analysis on the Metal Droplets Impacting and Spreading out on the Substrate [J]. | RARE METAL MATERIALS AND ENGINEERING , 2017 , 46 (4) : 893-898 .
MLA Li Suli et al. "A Numerical Analysis on the Metal Droplets Impacting and Spreading out on the Substrate" . | RARE METAL MATERIALS AND ENGINEERING 46 . 4 (2017) : 893-898 .
APA Li Suli , Wei Zhengying , Du Jun , Wei Pei , Lu Bingheng . A Numerical Analysis on the Metal Droplets Impacting and Spreading out on the Substrate . | RARE METAL MATERIALS AND ENGINEERING , 2017 , 46 (4) , 893-898 .
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Boundary conditions optimization of spindle thermal error analysis and thermal key points selection based on inverse heat conduction EI SCIE Scopus
期刊论文 | 2017 , 90 (9-12) , 2803-2812 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | IF: 2.601
WoS CC Cited Count: 2
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Abstract :

Thermal error of the spindle is one of the primary contributors of the inaccuracy of the precision machine tools. In order to study the thermal characteristics of the spindle, finite element analysis has been widely used. However, the accuracy of numerical simulation is highly dependent on the boundary conditions especially the coefficients of convection heat transfer. In this paper, the inverse heat conduction theory is introduced and used for optimizing the coefficients of convection heat transfer. Then, the temperature field and thermal error of the spindle are simulated in ANSYS. Based on the simulation results, a new method called mean impact value is proposed to select the thermal key points in the spindle system. Finally, the verification experiments are conducted on a precision horizontal machining center. By comparing the simulation results with the experimental data, the correctness and effectiveness of the heat convection coefficient optimization are verified. In addition, the results of thermal error modeling based on multiple variables including the temperatures of the thermal key points show that the result of the thermal key point selection is satisfying.

Keyword :

Mean impact value Coefficients of convection heat transfer Inverse heat transfer Thermal error Thermal key point

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GB/T 7714 Li, Yang , Zhao, Wanhua , Wu, Wenwu et al. Boundary conditions optimization of spindle thermal error analysis and thermal key points selection based on inverse heat conduction [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2017 , 90 (9-12) : 2803-2812 .
MLA Li, Yang et al. "Boundary conditions optimization of spindle thermal error analysis and thermal key points selection based on inverse heat conduction" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 90 . 9-12 (2017) : 2803-2812 .
APA Li, Yang , Zhao, Wanhua , Wu, Wenwu , Lu, Bingheng . Boundary conditions optimization of spindle thermal error analysis and thermal key points selection based on inverse heat conduction . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2017 , 90 (9-12) , 2803-2812 .
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Manufacturing of mushroom-shaped structures and its hydrophobic robustness analysis based on energy minimization approach EI SCIE Scopus
期刊论文 | 2017 , 7 (7) | AIP ADVANCES | IF: 1.653
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Abstract :

The construction of stable hydrophobic surfaces has increasingly gained attention owing to its wide range of potential applications. However, these surfaces may become wet and lose their slip effect owing to insufficient hydrophobic stability. Pillars with a mushroom-shaped tip are believed to enhance hydrophobicity stability. This work presents a facile method of manufacturing mushroom-shaped structures, where, compared with the previously used method, the modulation of the cap thickness, cap diameter, and stem height of the structures is more convenient. The effects of the development time on the cap diameter and overhanging angle are investigated and well-defined mushroom-shaped structures are demonstrated. The effect of the microstructure geometry on the contact state of a droplet is predicted by taking an energy minimization approach and is experimentally validated with nonvolatile ultraviolet-curable polymer with a low surface tension by inspecting the profiles of liquid-vapor interface deformation and tracking the trace of the receding contact line after exposure to ultraviolet light. Theoretical and experimental results show that, compared with regular pillar arrays having a vertical sidewall, the mushroom-like structures can effectively enhance hydrophobic stability. The proposed manufacturing method will be useful for fabricating robust hydrophobic surfaces in a cost-effective and convenient manner. (C) 2017 Author(s).

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GB/T 7714 Wang, Li , Yang, Xiaonan , Wang, Quandai et al. Manufacturing of mushroom-shaped structures and its hydrophobic robustness analysis based on energy minimization approach [J]. | AIP ADVANCES , 2017 , 7 (7) .
MLA Wang, Li et al. "Manufacturing of mushroom-shaped structures and its hydrophobic robustness analysis based on energy minimization approach" . | AIP ADVANCES 7 . 7 (2017) .
APA Wang, Li , Yang, Xiaonan , Wang, Quandai , Yang, Zhiqiang , Duan, Hui , Lu, Bingheng . Manufacturing of mushroom-shaped structures and its hydrophobic robustness analysis based on energy minimization approach . | AIP ADVANCES , 2017 , 7 (7) .
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Free vibration and buckling of foam-filled composite corrugated sandwich plates under thermal loading EI SCIE Scopus
期刊论文 | 2017 , 172 , 173-189 | COMPOSITE STRUCTURES | IF: 4.101
WoS CC Cited Count: 6
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Abstract :

The free vibration and buckling behaviors of foam-filled composite corrugated sandwich plates under thermal loading are investigated theoretically. A refined shear deformation theory is extended incorporating two different combinations of hyperbolic and parabolic shear shape functions. Equivalent thermoelastic properties of the foam-filled corrugation are obtained using the method of homogenization based on the Gibbs free energy. Based on hyperbolic-polynomial variation of all displacements across the thickness of both face sheets and sandwich core, the shear plate theory accounts for both transverse shear and thickness stretching effects. The theoretical predictions are validated against existing results as well as finite element simulations. The effects of geometric and material parameters on natural frequency and critical temperature change for buckling are systematically investigated. The proposed theory is not only accurate but also simple in predicting the free vibration and thermal buckling responses of composite sandwich plates with foam-filled corrugated cores. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Foam-filled corrugated core Thermal loading Composite sandwich plate Refined shear theory

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GB/T 7714 Han, Bin , Qin, Ke-Ke , Zhang, Qian-Cheng et al. Free vibration and buckling of foam-filled composite corrugated sandwich plates under thermal loading [J]. | COMPOSITE STRUCTURES , 2017 , 172 : 173-189 .
MLA Han, Bin et al. "Free vibration and buckling of foam-filled composite corrugated sandwich plates under thermal loading" . | COMPOSITE STRUCTURES 172 (2017) : 173-189 .
APA Han, Bin , Qin, Ke-Ke , Zhang, Qian-Cheng , Zhang, Qi , Lu, Tian Jian , Lu, Bing-Heng . Free vibration and buckling of foam-filled composite corrugated sandwich plates under thermal loading . | COMPOSITE STRUCTURES , 2017 , 172 , 173-189 .
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