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学者姓名:卢秉恒

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< Page ,Total 74 >
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: 2
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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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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: 2 SCOPUS Cited Count: 5
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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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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: 1 SCOPUS Cited Count: 2
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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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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
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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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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: 1
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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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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
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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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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: 1 SCOPUS Cited Count: 1
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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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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 SCOPUS Cited Count: 2
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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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Forming metal components through a novel fused-coating based additive manufacturing EI SCIE Scopus
期刊论文 | 2017 , 23 (5) , 893-903 | RAPID PROTOTYPING JOURNAL | IF: 2.346
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Abstract :

Purpose - This paper aimed to propose a novel fused-coating-based additive manufacturing (FCAM); the study of key process parameters and mechanical tests are performed to determine the proper parameters when building metal components. Design/methodology/approach - Sn63Pb37 alloy is deposited in an induction heating furnace with a fused-coating nozzle to build metal parts on a copper-clad substrate. The process parameters including nozzle pressure, nozzle and substrate temperature and nozzle gap between substrate are analyzed and found to have great influence on parts quality. The mechanical property tests between the fused-coating and casting parts are performed in horizontal and vertical directions. Also, the optical microscopy images are used to ascertain under which conditions good bonding can be achieved. Findings - A FCAM method is proposed, and the exploration study about the manufacturing process is carried out. The critical parameters are analyzed, and microscopy images prove the suitable temperature range that requires to fabricate metal parts. The mechanical tests confirm that tensile strength of printing parts is improved by 20.4 and 11.9 per cent in horizontal and vertical direction than casting parts. The experimental results indicate that there is a close relationship between process parameters and mechanical properties. Originality/value - This paper proves that FCAM provides an alternative way to quickly make functional metal parts with good quality and flexibility compared with other additive manufacturing methods. Moreover, good mechanical property is achieved than conventional casting parts.

Keyword :

Fused-coating Mechanical properties Additive manufacturing Sn63Pb37 alloy Process parameters

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GB/T 7714 Fang, Xuewei , Wei, Zhengying , Du, Jun et al. Forming metal components through a novel fused-coating based additive manufacturing [J]. | RAPID PROTOTYPING JOURNAL , 2017 , 23 (5) : 893-903 .
MLA Fang, Xuewei et al. "Forming metal components through a novel fused-coating based additive manufacturing" . | RAPID PROTOTYPING JOURNAL 23 . 5 (2017) : 893-903 .
APA Fang, Xuewei , Wei, Zhengying , Du, Jun , Lu Bingheng , He, Pengfei , Wang, Bowen et al. Forming metal components through a novel fused-coating based additive manufacturing . | RAPID PROTOTYPING JOURNAL , 2017 , 23 (5) , 893-903 .
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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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