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学者姓名:卢天健

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< Page ,Total 52 >
Dual-level stress plateaus in honeycombs subjected to impact loading: perspectives from bucklewaves, buckling and cell-wall progressive folding EI Scopus CSCD SCIE
期刊论文 | 2019 , 35 (1) , 70-77 | Acta Mechanica Sinica/Lixue Xuebao
SCOPUS Cited Count: 1
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Abstract :

Dual-level stress plateaus (i.e., relatively short peak stress plateaus, followed by prolonged crushing stress plateaus) in metallic hexagonal honeycombs subjected to out-of-plane impact loading are characterized using a combined numerical and analytical study, with the influence of the strain-rate sensitivity of the honeycomb parent material accounted for. The predictions are validated against existing experimental measurements, and good agreement is achieved. It is demonstrated that honeycombs exhibit dual-level stress plateaus when bucklewaves are initiated and propagate in cell walls, followed by buckling and progressive folding of the cell walls. The abrupt stress drop from peak to crushing plateau in the compressive stress versus strain curve can be explained in a way similar to the quasi-static buckling of a clamped plate. The duration of the peak stress plateau is more evident for strain-rate insensitive honeycombs. © 2018, The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag GmbH Germany, part of Springer Nature.

Keyword :

Analytical studies Clamped plates Hexagonal honeycomb Honeycomb Impact loadings Parent materials Quasi-static buckling Strain rate sensitivity

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GB/T 7714 Li, Lang , Zhao, Zhenyu , Zhang, Rui et al. Dual-level stress plateaus in honeycombs subjected to impact loading: perspectives from bucklewaves, buckling and cell-wall progressive folding [J]. | Acta Mechanica Sinica/Lixue Xuebao , 2019 , 35 (1) : 70-77 .
MLA Li, Lang et al. "Dual-level stress plateaus in honeycombs subjected to impact loading: perspectives from bucklewaves, buckling and cell-wall progressive folding" . | Acta Mechanica Sinica/Lixue Xuebao 35 . 1 (2019) : 70-77 .
APA Li, Lang , Zhao, Zhenyu , Zhang, Rui , Han, Bin , Zhang, Qiancheng , Lu, Tian Jian . Dual-level stress plateaus in honeycombs subjected to impact loading: perspectives from bucklewaves, buckling and cell-wall progressive folding . | Acta Mechanica Sinica/Lixue Xuebao , 2019 , 35 (1) , 70-77 .
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Improvement of the sound absorption of flexible micro-perforated panels by local resonances EI SCIE Scopus
期刊论文 | 2019 , 117 , 138-156 | MECHANICAL SYSTEMS AND SIGNAL PROCESSING
WoS CC Cited Count: 2 SCOPUS Cited Count: 1
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Abstract :

To further improve the sound absorption enhancement of flexible micro-perforated panels (FMPPs), a new sort of perforated sound absorbers - metamaterial-based micro-perforated panels (MMPPs) - is proposed by combining a micro-perforated host panel and local resonators (LRs) attached on a sub-wavelength scale, targeting the flexural waves. Theoretical and numerical models show that MMPPs are able to further enhance sound absorption in a wide frequency range. The theoretical model is developed based on the effective medium method as the structural wavelength in the host panel is much larger than the distance between the LRs, and the full simulation model, including viscothermal effects, is conducted by utilizing multi-physical coupling integrated in COMSOL. Besides, a structural finite element unit cell method is used to evaluate the stop band behavior of the MMPP. Good agreement is achieved between the theoretically predicted acoustical properties and the simulation results for both conventional FMPPs and the proposed MMPPs, validating the numerical and theoretical models. Both models reveal that the sound absorption enhancement of the MMPP stems from the resulting acoustic surface impedance improvement, caused by the sub-wavelength attached local resonances. The effect of key properties of the LRs (i.e. mass, damping and multiple resonances) on the sound absorption performance of MMPPs is then analyzed by applying the theoretical model and effective frequency-adjustability of the absorption enhancement performance is found. The proposed MMPP shows great potential for the noise reduction industry. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Stop band Micro-perforated panel Metamaterial Absorption improvement Effective medium method

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GB/T 7714 Ren, S. W. , Van Belle, L. , Claeys, C. et al. Improvement of the sound absorption of flexible micro-perforated panels by local resonances [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2019 , 117 : 138-156 .
MLA Ren, S. W. et al. "Improvement of the sound absorption of flexible micro-perforated panels by local resonances" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 117 (2019) : 138-156 .
APA Ren, S. W. , Van Belle, L. , Claeys, C. , Xin, F. X. , Lu, T. J. , Deckers, E. et al. Improvement of the sound absorption of flexible micro-perforated panels by local resonances . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2019 , 117 , 138-156 .
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Droplet based vitrification for cell aggregates: Numerical analysis EI SCIE PubMed Scopus
期刊论文 | 2018 , 82 , 383-393 | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
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Abstract :

Cell aggregates represent the main format of cells existing in vivo and have been widely used as tissue and disease models in vitro. Nevertheless, the preservation of cell aggregates while maintaining their functionalities for off the -shelf applications is still challenging. Among various preservation methods, droplet-based vitrification exhibits superior advantages for the cryopreservation of cell aggregates; however, the physical mechanisms underlying droplet-based vitrification of cell aggregate using this method remain elusive. To address this issue, we proposed a voronoi model to construct two-dimensional geometric morphologies of cell aggregates and established a coupled physical model to describe the diffusion, heat transfer and crystallization processes during vitrification. Based on these models, we performed a numerical study on the variation and distribution of cryoprotectant (CPA) concentration, temperature and crystallization in cell aggregates during droplet-based vitrification. The results show that although cell membrane is not an obvious barrier in heat transfer, it affects the diffusion of CPA remarkably as a biologic film and thus the following crystallization in cell aggregates. The effective protection of CPA during vitrification occurs during the initial stage of CPA diffusion, thus a longer CPA loading time does not necessarily lead to significant decrease in crystallization, but rather may induce more toxicity to cells.

Keyword :

Cell aggregates Cell membrane Simulation Vitrification

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GB/T 7714 Shi, Meng , Feng, Shangsheng , Zhang, Xiaohui et al. Droplet based vitrification for cell aggregates: Numerical analysis [J]. | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2018 , 82 : 383-393 .
MLA Shi, Meng et al. "Droplet based vitrification for cell aggregates: Numerical analysis" . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 82 (2018) : 383-393 .
APA Shi, Meng , Feng, Shangsheng , Zhang, Xiaohui , Ji, Changchun , Xu, Feng , Lu, Tian Jian . Droplet based vitrification for cell aggregates: Numerical analysis . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2018 , 82 , 383-393 .
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Modulation of acoustomechanical instability and bifurcation behavior of soft materials SCIE PubMed Scopus
期刊论文 | 2018 , 8 | Scientific Reports
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Abstract :

© 2018, The Author(s). We demonstrate acoustically triggered giant deformation of soft materials, and reveal the snap-through instability and bifurcation behavior of soft materials in nonlinear deformation regime in response to combined loading of mechanical and acoustic radiation forces. Our theoretical results suggest that acoustomechanical instability and bifurcation can be readily modulated by varying either the mechanical or acoustic force. This modulation functionality arises from the sensitivity of acoustic wave propagation to nonlinear deformation of soft material, particularly to ratio of initial geometrical size of soft material to acoustic wavelength in the material. The tunable acoustomechanical instability and bifurcation behavior of soft materials enables innovative design of programmable mechanical metamaterials. PACS numbers: 43.35.+d, 43.25.+y, 46.70.De, 61.41.+e.

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GB/T 7714 Xin, Fengxian , Lu, Tian Jian . Modulation of acoustomechanical instability and bifurcation behavior of soft materials [J]. | Scientific Reports , 2018 , 8 .
MLA Xin, Fengxian et al. "Modulation of acoustomechanical instability and bifurcation behavior of soft materials" . | Scientific Reports 8 (2018) .
APA Xin, Fengxian , Lu, Tian Jian . Modulation of acoustomechanical instability and bifurcation behavior of soft materials . | Scientific Reports , 2018 , 8 .
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Natural convection in a cross-fin heat sink EI SCIE Scopus
期刊论文 | 2018 , 132 , 30-37 | APPLIED THERMAL ENGINEERING
WoS CC Cited Count: 11 SCOPUS Cited Count: 14
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Abstract :

A novel cross-fin heat sink consisting of a series of long fins and a series of perpendicularly arranged short fins was proposed to enhance natural convective heat transfer. The design principle of the cross-fin heat sink was based on overcoming internal thermal fluid-flow defects in a conventional plate-fin heat sink. The thermal performance of the proposed heat sink was compared with a reference plate-fin heat sink in horizontal orientation. A numerical model considering both natural convection and radiation heat transfer was developed to obtain thermal fluid-flow distributions and heat transfer coefficients of both the cross- and plate-fin heat sinks. Corresponding experiments were performed to validate the model predictions. It was demonstrated that, compared to the reference plate-fin heat sink, the cross-fin heat sink enhanced the overall (including natural convection and radiation) and convective (excluding radiation) heat transfer coefficients by 11% and 15%, respectively. Importantly, the enhancement was achieved without increasing the overall volume, material consumption, and too much extra cost. The proposed cross-fin heat sink provides a practical alternative to the widely adopted plate-fin heat sinks. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Cross-fin heat sink Heat transfer enhancement Natural convection Plate-fin heat sink

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GB/T 7714 Feng, Shangsheng , Shi, Meng , Yan, Hongbin et al. Natural convection in a cross-fin heat sink [J]. | APPLIED THERMAL ENGINEERING , 2018 , 132 : 30-37 .
MLA Feng, Shangsheng et al. "Natural convection in a cross-fin heat sink" . | APPLIED THERMAL ENGINEERING 132 (2018) : 30-37 .
APA Feng, Shangsheng , Shi, Meng , Yan, Hongbin , Sun, Shanyouming , Li, Feichen , Lu, Tian Jian . Natural convection in a cross-fin heat sink . | APPLIED THERMAL ENGINEERING , 2018 , 132 , 30-37 .
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Buckling of a standing corrugated sandwich plate subjected to body force and terminal load EI SCIE Scopus
期刊论文 | 2018 , 127 , 688-699 | THIN-WALLED STRUCTURES
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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Abstract :

The global buckling behavior of a vertically standing corrugated sandwich plate subjected to body force and terminal load is analyzed through an improved first order zig-zag shear deformation theory, with the transverse shear effect of face sheets taken into account. When the face sheets are relatively thick and/or the sandwich plate has relatively large thickness to height ratios, the transverse shear effect of the face sheets affects significantly the critical buckling load. The effect becomes more obvious when body force rather than terminal load is applied on the clamped plates. The influence of geometric parameters on critical buckling parameters is also explored.

Keyword :

Body force Corrugated sandwich Shear effect Stability analysis Zig-zag

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GB/T 7714 Li, Fei-Hao , Han, Bin , Zhang, Qian-Cheng et al. Buckling of a standing corrugated sandwich plate subjected to body force and terminal load [J]. | THIN-WALLED STRUCTURES , 2018 , 127 : 688-699 .
MLA Li, Fei-Hao et al. "Buckling of a standing corrugated sandwich plate subjected to body force and terminal load" . | THIN-WALLED STRUCTURES 127 (2018) : 688-699 .
APA Li, Fei-Hao , Han, Bin , Zhang, Qian-Cheng , Jin, Feng , Lu, Tian Jian . Buckling of a standing corrugated sandwich plate subjected to body force and terminal load . | THIN-WALLED STRUCTURES , 2018 , 127 , 688-699 .
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Magnetic-responsive Fe3O4 nanoparticle-impregnated cellulose paper actuators EI SCIE Scopus
期刊论文 | 2018 , 25 , 53-59 | Extreme Mechanics Letters
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

© 2018 Elsevier Ltd Fe3O4 nanoparticle-infiltrated chromatography paper is prepared using a low-cost blending method. Upon characterizing the basic material properties of the Fe3O4/paper nanocomposite, beam-, accordion- and star-shaped actuators are constructed using the nanocomposite and the corresponding actuation performance is investigated experimentally. The beam-shaped actuator exhibits a reversible flexural deformation due to low magnetic hysteresis loop of the Fe3O4/paper nanocomposite, maintaining a stable response after 100 cycles. The accordion-shaped actuator can reach a maximum strain of 100% while the star-shaped actuator can capture a spitball twice heavier than itself.

Keyword :

Actuator Cellulose paper Fe3O4 nanoparticles Magnetic hysteresis Microstructure Nanocomposites

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GB/T 7714 Wang, Xin , Han, Bin , Yu, Run-Pei et al. Magnetic-responsive Fe3O4 nanoparticle-impregnated cellulose paper actuators [J]. | Extreme Mechanics Letters , 2018 , 25 : 53-59 .
MLA Wang, Xin et al. "Magnetic-responsive Fe3O4 nanoparticle-impregnated cellulose paper actuators" . | Extreme Mechanics Letters 25 (2018) : 53-59 .
APA Wang, Xin , Han, Bin , Yu, Run-Pei , Li, Fei-Chen , Zhao, Zhen-Yu , Zhang, Qian-Cheng et al. Magnetic-responsive Fe3O4 nanoparticle-impregnated cellulose paper actuators . | Extreme Mechanics Letters , 2018 , 25 , 53-59 .
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Three-point bending of honeycomb sandwich beams with facesheet perforations EI SCIE CSCD Scopus
期刊论文 | 2018 , 34 (4) , 667-675 | ACTA MECHANICA SINICA
SCOPUS Cited Count: 1
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Abstract :

A novel square honeycomb-cored sandwich beam with perforated bottom facesheet is investigated under three-point bending, both analytically and numerically. Perforated square holes in the bottom facesheet are characterized by the area ratio of the hole to intact facesheet (perforation ratio). While for large-scale engineering applications like the decks of cargo vehicles and transportation ships, the perforations are needed to facilitate the fabrication process (e.g., laser welding) as well as service maintenance, it is demonstrated that these perforations, when properly designed, can also enhance the resistance of the sandwich to bending. For illustration, fair comparisons among competing sandwich designs having different perforation ratios but equal mass is achieved by systematically thickening the core webs. Further, the perforated sandwich beam is designed with a relatively thick facesheet to avoid local indention failure so that it mainly fails in two competing modes: (1) bending failure, i.e., yielding of beam cross-section and buckling of top facesheet caused by bending moment; (2) shear failure, i.e., yielding and buckling of core webs due to shear forcing. The sensitivity of the failure loads to the ratio of core height to beam span is also discussed for varying perforation ratios. As the perforation ratio is increased, the load of shear failure increases due to thickening core webs, while that of bending failure decreases due to the weakening bottom facesheet. Design of a sandwich beam with optimal perforation ratio is realized when the two failure loads are equal, leading to significantly enhanced failure load (up to 60% increase) relative to that of a non-perforated sandwich beam with equal mass.

Keyword :

Analytical model Facesheet perforation Honeycomb sandwich Three-point bending

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GB/T 7714 Su, Pengbo , Han, Bin , Zhao, Zhongnan et al. Three-point bending of honeycomb sandwich beams with facesheet perforations [J]. | ACTA MECHANICA SINICA , 2018 , 34 (4) : 667-675 .
MLA Su, Pengbo et al. "Three-point bending of honeycomb sandwich beams with facesheet perforations" . | ACTA MECHANICA SINICA 34 . 4 (2018) : 667-675 .
APA Su, Pengbo , Han, Bin , Zhao, Zhongnan , Zhang, Qiancheng , Lu, Tian Jian . Three-point bending of honeycomb sandwich beams with facesheet perforations . | ACTA MECHANICA SINICA , 2018 , 34 (4) , 667-675 .
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Natural convection in metal foam heat sinks with open slots EI SCIE Scopus
期刊论文 | 2018 , 91 , 354-362 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
WoS CC Cited Count: 5 SCOPUS Cited Count: 4
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Abstract :

Natural convection in metal foam heat sinks with open slots was investigated experimentally. The test sample was made in-house by attaching several foam strips having fixed width of 10 mm and length of 100 mm onto a substrate of 100 x 100 x 4 mm(3) in size. A total of 29 test samples with different slot widths (s = 0/2.86/5/8/12.5/20 mm) and foam heights (H = 10/20/40/60/80 mm) were tested under both horizontal and vertical orientations for each sample. The zero width of open slots corresponds to a heat sink with a single foam block as considered in open literature, while the non-zero open slot width 2.86/5/8/12.5/20 mm corresponds to 8/7/6/5/4 foam strips in a heat sink, respectively. Compared to a single foam block, the foam with open slots are more permeable for air penetrating through the heat sink. More foam strips means more heat transfer area available but less permeation of the heat sink. Experimental results revealed that there exists an optimum open slot width (5-8 mm) for maximum heat transfer coefficient at given heat sink volume. With optimum open slot width, the heat transfer coefficient is enhanced by 14.9%, 21.3%, 37.6%, and 38.2% relative to single foam block (s = 0 mm) at the foam height of 10 mm, 20 mm, 40 mm, and 80 mm, respectively. (C) 2017 Published by Elsevier Inc.

Keyword :

Heat sink Metal foam Natural convection Open slots Optimum slot width

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GB/T 7714 Feng, Shangsheng , Li, Feichen , Zhang, Fenghui et al. Natural convection in metal foam heat sinks with open slots [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 : 354-362 .
MLA Feng, Shangsheng et al. "Natural convection in metal foam heat sinks with open slots" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 91 (2018) : 354-362 .
APA Feng, Shangsheng , Li, Feichen , Zhang, Fenghui , Lu, Tian Jian . Natural convection in metal foam heat sinks with open slots . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 , 354-362 .
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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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