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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
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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
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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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Non-contact tensile viscoelastic characterization of microscale biological materials EI SCIE CSCD Scopus
期刊论文 | 2018 , 34 (3) , 589-599 | ACTA MECHANICA SINICA
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

Many structures and materials in nature and physiology have important "meso-scale" structures at the micron length-scale whose tensile responses have proven difficult to characterize mechanically. Although techniques such as atomic force microscopy and micro- and nano-identation are mature for compression and indentation testing at the nano-scale, and standard uniaxial and shear rheometry techniques exist for the macroscale, few techniques are applicable for tensile-testing at the micrometre-scale, leaving a gap in our understanding of hierarchical biomaterials. Here, we present a novel magnetic mechanical testing (MMT) system that enables viscoelastic tensile testing at this critical length scale. The MMT system applies non-contact loading, avoiding gripping and surface interaction effects. We demonstrate application of the MMT system to the first analyses of the pure tensile responses of several native and engineered tissue systems at the mesoscale, showing the broad potential of the system for exploring micro- and meso-scale analysis of structured and hierarchical biological systems.

Keyword :

Hierarchical biomaterials Mechanical testing Microscale analysis Non-contact actuation

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GB/T 7714 Li, Yuhui , Hong, Yuan , Xu, Guang-Kui et al. Non-contact tensile viscoelastic characterization of microscale biological materials [J]. | ACTA MECHANICA SINICA , 2018 , 34 (3) : 589-599 .
MLA Li, Yuhui et al. "Non-contact tensile viscoelastic characterization of microscale biological materials" . | ACTA MECHANICA SINICA 34 . 3 (2018) : 589-599 .
APA Li, Yuhui , Hong, Yuan , Xu, Guang-Kui , Liu, Shaobao , Shi, Qiang , Tang, Deding et al. Non-contact tensile viscoelastic characterization of microscale biological materials . | ACTA MECHANICA SINICA , 2018 , 34 (3) , 589-599 .
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Out-of-plane compression of Ti-6Al-4V sandwich panels with corrugated channel cores EI SCIE Scopus
期刊论文 | 2018 , 137 , 463-472 | MATERIALS & DESIGN
WoS CC Cited Count: 2 SCOPUS Cited Count: 4
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Abstract :

A novel sandwich core topology - corrugated channels (periodic fluid-through wavy passages) - was proposed for simultaneous load-bearing and active cooling applications. Relative to a sandwich panel with parallel plate channels, the sandwich with corrugated channel core exhibits not only significantly enhanced convective heat transfer rate but also superior mechanical performance. To explore the underlying deformation and failure mech-anisms, corrugated-channel-cored sandwich panels (3CSPs) with low relative densities (<1.5%) were manufactured, with Ti-6Al-4V alloy used as the constituent material for both the core and the face sheets. The quasi-static, out-of-plane compressive behaviors of Ti-6Al-4V sandwich panels were systematically studied using a combined experimental, analytical and numerical approach. The compressive strength of the proposed 3CSP was also compared with competing core topologies on the material selection map. With superior structural and thermal efficiency, the corrugated channel core is promising for a wide variety of multifunctional lightweight sandwich constructions. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Buckling Compressive response Corrugations Sandwich panel Titanium alloy

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GB/T 7714 Zhao, Zhen-yu , Han, Bin , Wang, Xin et al. Out-of-plane compression of Ti-6Al-4V sandwich panels with corrugated channel cores [J]. | MATERIALS & DESIGN , 2018 , 137 : 463-472 .
MLA Zhao, Zhen-yu et al. "Out-of-plane compression of Ti-6Al-4V sandwich panels with corrugated channel cores" . | MATERIALS & DESIGN 137 (2018) : 463-472 .
APA Zhao, Zhen-yu , Han, Bin , Wang, Xin , Zhang, Qian-cheng , Lu, Tian Jian . Out-of-plane compression of Ti-6Al-4V sandwich panels with corrugated channel cores . | MATERIALS & DESIGN , 2018 , 137 , 463-472 .
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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: 3 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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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: 2 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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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: 2 SCOPUS Cited Count: 5
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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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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
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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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Influence of hole shape on sound absorption of underwater anechoic layers EI SCIE Scopus
期刊论文 | 2018 , 426 , 54-74 | JOURNAL OF SOUND AND VIBRATION
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A theoretical model is established to evaluate the sound absorption performance of underwater anechoic layers containing periodically distributed axial holes. Based on the concept for homogenized equivalent layer and on the theory of wave propagation in viscoelastic cylindrical tubes, the transfer function method is used to obtain the absorption coefficient of the anechoic layer adhered on the rigid plate. Three different types of axial holes are considered, the cylindrical, the conical and the horn shaped one. Results obtained with full finite element simulations are used to validate the model predictions. For each hole type, the vibration characteristics of the anechoic layer as well as the propagation of longitudinal and transverse waves in the layer are analyzed in detail to explore the physical mechanisms underlying its absorption performance. Furthermore, a three-dimensional finite element model for oblique incidence is developed to study the effect of hole shape at different incidence angles. The results show that two new absorption peaks appear since the oblique incidence excites two horizontal modes. Among the three hole types, the horn one achieves the best absorption performance at relatively low frequencies both in normal incidence and in oblique incidence. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Analytical modeling Hole shape Sound absorption Underwater anechoic layer

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GB/T 7714 Ye, Changzheng , Liu, Xuewei , Xin, Fengxian et al. Influence of hole shape on sound absorption of underwater anechoic layers [J]. | JOURNAL OF SOUND AND VIBRATION , 2018 , 426 : 54-74 .
MLA Ye, Changzheng et al. "Influence of hole shape on sound absorption of underwater anechoic layers" . | JOURNAL OF SOUND AND VIBRATION 426 (2018) : 54-74 .
APA Ye, Changzheng , Liu, Xuewei , Xin, Fengxian , Lu, Tian Jian . Influence of hole shape on sound absorption of underwater anechoic layers . | JOURNAL OF SOUND AND VIBRATION , 2018 , 426 , 54-74 .
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