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学者姓名:卢秉恒

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< Page ,Total 74 >
Iso-parametric path-planning method of twin-tool milling for turbine blades EI SCIE Scopus
期刊论文 | 2018 , 98 (9-12) , 3179-3189 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
WoS CC Cited Count: 1
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Abstract :

Twin-tool milling is a new method for turbine blade machining. The dorsal and basin surfaces are machined simultaneously, which can improve the machining efficiency obviously. However, its tool path planning becomes a major challenge due to the asymmetry of the blade surfaces and the structural constraints of the twin-tool machine. In this paper, an iso-parametric path-planning method is proposed for turbine blades milling with twin tools. Considering the structural constraints, the twin-tool orientations are characterized uniformly. In order to guarantee the smoothness of the tool paths, the calculating and equally parameterized fitting algorithm for the cutter contact (CC) points in each path is proposed. Furthermore, the opposite tool paths are matched with a self-defined ratio to realize the simultaneous milling for both blade surfaces. Finally, the tool paths are planned for a typical turbine blade based on the method. The results of simulation and verification experiments show that both blade surfaces are entirely machined. The contour errors can meet the tolerance requirements. In addition, the efficiency increases by about 45% compared with the single-tool milling of the equivalent cutting parameters.

Keyword :

Iso-parametric Path-planning method Twin-tool milling Turbine blade

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GB/T 7714 Song, Dongdong , Xue, Fei , Wu, Diaodiao et al. Iso-parametric path-planning method of twin-tool milling for turbine blades [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 98 (9-12) : 3179-3189 .
MLA Song, Dongdong et al. "Iso-parametric path-planning method of twin-tool milling for turbine blades" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 98 . 9-12 (2018) : 3179-3189 .
APA Song, Dongdong , Xue, Fei , Wu, Diaodiao , Zhang, Jun , Zhang, Xing , Zhao, Wanhua et al. Iso-parametric path-planning method of twin-tool milling for turbine blades . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 98 (9-12) , 3179-3189 .
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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: 4 SCOPUS Cited Count: 7
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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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Tube enhanced foam: A novel way for aluminum foam enhancement EI SCIE Scopus
期刊论文 | 2018 , 227 , 70-73 | MATERIALS LETTERS
WoS CC Cited Count: 4 SCOPUS Cited Count: 3
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Abstract :

Aluminum foam was limited when applied as load carrying structures for its lower strength. Therefore, an effective enhancement method of aluminum foam was reported in the present study by filling of 304 stainless steel tube into a pre-perforated hole and fixed by epoxy glue. The experimental results indicate that the novel tube enhanced foam (with equivalent density of foam) can doubled the specific compressive strength and energy absorption of that of aluminum foam, and even larger than that of the sum of tube and foam which were tested separately. The coupling strengthening mechanisms are suggested to be the instability limitation of steel tube due to the lateral supports (external and internal) supplied by aluminum foam. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Compressive strength Energy absorption Porous materials Structural Tube enhanced foam

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GB/T 7714 Yan, L. L. , Zhao, Z. Y. , Han, B. et al. Tube enhanced foam: A novel way for aluminum foam enhancement [J]. | MATERIALS LETTERS , 2018 , 227 : 70-73 .
MLA Yan, L. L. et al. "Tube enhanced foam: A novel way for aluminum foam enhancement" . | MATERIALS LETTERS 227 (2018) : 70-73 .
APA Yan, L. L. , Zhao, Z. Y. , Han, B. , Lu, T. J. , Lu, B. H. . Tube enhanced foam: A novel way for aluminum foam enhancement . | MATERIALS LETTERS , 2018 , 227 , 70-73 .
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Creep of closed-cell aluminum foams: Effects of imperfections and predictive modeling EI SCIE Scopus
期刊论文 | 2018 , 156 , 229-241 | MATERIALS & DESIGN
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

The influence of five different types of morphological imperfection - curved cell wall, corrugation, cell shape irregularity, missing cell walls and non-uniform distribution of cell wall thickness - on steady state creep of closed-cell aluminum foams is systematically studied under uniaxial compressive loading. A refined theoretical model is developed to predict the steady state creep rate of idealized tetrakaidecahedral (TKD) closed-cell foams. Based upon the TKD model, finite element modeling is also carried out. The presence of imperfections usually leads to significant increase in steady state creep rate. The creep rate increases linearly with the degree of cell shape irregularity and the curvature of curved cell walls, while increases as a power law function of the area fraction of missing cell walls and the dispersion degree of non-uniform distributed cell wall thickness. The combined effect of three different random defects-cell shape irregularity, missing cell walls and non-uniform distribution of cell wall thickness-causes more drastic increase in creep rate than any single or dual imperfections. Interactions among the three are small and can be neglected. Finally, an empirical formula of steady state creep rate is proposed to give a good prediction for closed-cell foams with random imperfections. (C) 2018 Published by Elsevier Ltd.

Keyword :

Closed-cell foam Finite element modeling Imperfections Steady state creep Theoretical modeling

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GB/T 7714 Han, Bin , Yu, Run-Pei , Zhang, Qian-Cheng et al. Creep of closed-cell aluminum foams: Effects of imperfections and predictive modeling [J]. | MATERIALS & DESIGN , 2018 , 156 : 229-241 .
MLA Han, Bin et al. "Creep of closed-cell aluminum foams: Effects of imperfections and predictive modeling" . | MATERIALS & DESIGN 156 (2018) : 229-241 .
APA Han, Bin , Yu, Run-Pei , Zhang, Qian-Cheng , Gao, Hua-Jian , Zhang, Qi , Lu, Tian Jian et al. Creep of closed-cell aluminum foams: Effects of imperfections and predictive modeling . | MATERIALS & DESIGN , 2018 , 156 , 229-241 .
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Effects of aluminum foam filling on the low-velocity impact response of sandwich panels with corrugated cores EI Scopus
期刊论文 | 2018 | Journal of Sandwich Structures and Materials
SCOPUS Cited Count: 3
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Abstract :

In this study, a closed-cell aluminum foam was filled into the interspaces of a sandwich panel with corrugated cores to form a composite structure. The novel structure is expected to have enhanced foam-filled cores with high specific strength and energy absorption capacity. An out-of-plane compressive load under low-velocity impact was experimentally and numerically carried out on both the empty and foam-filled sandwich panels as well as on the aluminum foam. It is found that the empty corrugated sandwich panel has poor energy absorption capacity due to the core member buckling compared to that of the aluminum foam. However, by the filling of the aluminum foam, the impact load resistance of the corrugated panel was increased dramatically. The loading-time response of the foam-filled panel performs a plateau region like the aluminum foam, which has been proved to be an excellent energy absorption material. Numerical results demonstrated that the aluminum foam filling can decrease the corrugated core member defects sensitivity and increase its stability dramatically. The plastic energy dissipation of the core member for the foam-filled panel is much higher than that of the empty one due to the reduced buckling wavelength caused by the aluminum foam filling. © 2018, The Author(s) 2018.

Keyword :

Closed-cell aluminum foam Corrugated core Energy absorption capacity Energy absorption materials Foam filled Low velocity impact Plastic energy dissipation Sandwich panel

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GB/T 7714 Yan, L.L. , Yu, B. , Han, B. et al. Effects of aluminum foam filling on the low-velocity impact response of sandwich panels with corrugated cores [J]. | Journal of Sandwich Structures and Materials , 2018 .
MLA Yan, L.L. et al. "Effects of aluminum foam filling on the low-velocity impact response of sandwich panels with corrugated cores" . | Journal of Sandwich Structures and Materials (2018) .
APA Yan, L.L. , Yu, B. , Han, B. , Zhang, Q.C. , Lu, T.J. , Lu, B.H. . Effects of aluminum foam filling on the low-velocity impact response of sandwich panels with corrugated cores . | Journal of Sandwich Structures and Materials , 2018 .
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Closed-loop control of variable width deposition in laser metal deposition EI SCIE Scopus
期刊论文 | 2018 , 97 (9-12) , 4167-4178 | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
WoS CC Cited Count: 2 SCOPUS Cited Count: 4
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Abstract :

In laser metal deposition (LMD) technology, multi-track overlapping is usually used for the deposition of the unequal width thin-walled part. In the present study, a single-track deposition with the variable width method was proposed to improve deposition accuracy and efficiency, and reduce repeated heating. The hollow laser beam internal powder feeding nozzle was applied to realize variable laser spot deposition. Based on the developed deposition height sensor, a closed-loop control system and PI controller were developed and tested. A segmented deposition height control method was developed. The unequal width thin-walled part was divided into several segments along the scanning direction, and each segment was matched with different laser spot sizes. The segments were controlled to have unequal widths, but with an equal height. A thin-walled part with a width range of 5.08-2.14 mm and a "blade-shaped" part with a width range of 6.18-2.64 mm were deposited. The control curves of most segments were stable and convergent. The microstructure and properties of the formed part varied with wall width. All width areas achieved the compact and small size of the grains, as well as high microhardness.

Keyword :

Variable laser spot Closed-loop control Hollow laser beam Variable width deposition Laser metal deposition

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GB/T 7714 Shi, Tuo , Lu, Bingheng , Shen, Ting et al. Closed-loop control of variable width deposition in laser metal deposition [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 97 (9-12) : 4167-4178 .
MLA Shi, Tuo et al. "Closed-loop control of variable width deposition in laser metal deposition" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 97 . 9-12 (2018) : 4167-4178 .
APA Shi, Tuo , Lu, Bingheng , Shen, Ting , Zhang, Rui , Shi, Shihong , Fu, Geyan . Closed-loop control of variable width deposition in laser metal deposition . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2018 , 97 (9-12) , 4167-4178 .
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A refined quasi-3D zigzag beam theory for free vibration and stability analysis of multilayered composite beams subjected to thermomechanical loading EI Scopus SCIE
期刊论文 | 2018 , 204 , 620-633 | Composite Structures
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

A refined four-unknown quasi-3D zigzag beam theory is developed to model the free vibration and buckling behaviors of multilayered composite beams subjected to axial mechanical loading (e.g., distributed load and terminal force) and uniform temperature variation. Types of the composite beams considered include laminated composite beams, sandwich beams with composite face sheets, and fiber metal laminates. The proposed theory accounts for not only thickness stretching but also interlaminar continuity of transverse shear stresses and displacements. Associated eigenvalue problems for various boundary conditions are derived using the Ritz method. Accuracy and effectiveness of the theoretical predictions are verified by comparison with existing results and present finite element simulations. The theory is employed to quantify the effects of axial distributed load/terminal force and temperature variation on free vibration and buckling for different boundary conditions, geometric parameters and material properties. The present theory could produce sufficiently accurate predictions of natural frequencies and buckling capacities of multilayered beams at a very low computational cost. © 2018

Keyword :

Beam theories Different boundary condition Finite element simulations Laminated composite beam Layered Structures Thermo-mechanical loading Various boundary conditions Vibration

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GB/T 7714 Han, Bin , Hui, Wei-Wei , Zhang, Qian-Cheng et al. A refined quasi-3D zigzag beam theory for free vibration and stability analysis of multilayered composite beams subjected to thermomechanical loading [J]. | Composite Structures , 2018 , 204 : 620-633 .
MLA Han, Bin et al. "A refined quasi-3D zigzag beam theory for free vibration and stability analysis of multilayered composite beams subjected to thermomechanical loading" . | Composite Structures 204 (2018) : 620-633 .
APA Han, Bin , Hui, Wei-Wei , Zhang, Qian-Cheng , Zhao, Zhen-Yu , Jin, Feng , Zhang, Qi et al. A refined quasi-3D zigzag beam theory for free vibration and stability analysis of multilayered composite beams subjected to thermomechanical loading . | Composite Structures , 2018 , 204 , 620-633 .
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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
WoS CC Cited Count: 1
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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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面向高端装备制造业的高端制造装备需求趋势分析 CSCD PKU
期刊论文 | 2017 , (3) , 136-141 | 中国工程科学
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Abstract :

高端制造装备是高端装备制造业快速发展的基础,本文针对航空装备、航天装备、轨道<em>交通</em>装备、海洋工程装备、智能制造装备等高端装备制造业的“十三五”发展趋势,分析了各领域对高端机床和高端基础制造装备提出的新需求和未来的发展重点,并结合我国制造装备行业的现状,提出了几点建议,以促进我国高端装备制造业的良性发展.

Keyword :

高端制造装备 机床 基础制造装备 高端装备制造业

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GB/T 7714 张俊 , 卢秉恒 . 面向高端装备制造业的高端制造装备需求趋势分析 [J]. | 中国工程科学 , 2017 , (3) : 136-141 .
MLA 张俊 et al. "面向高端装备制造业的高端制造装备需求趋势分析" . | 中国工程科学 3 (2017) : 136-141 .
APA 张俊 , 卢秉恒 . 面向高端装备制造业的高端制造装备需求趋势分析 . | 中国工程科学 , 2017 , (3) , 136-141 .
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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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