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学者姓名：卢天健
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Abstract ：
The displacement of relatively rigid beads within a relatively compliant, elastic matrix can be used to measure the mechanical properties of the matrix. For example, in mechanobiological studies, magnetic or reflective beads can be displaced with a known external force to estimate the matrix modulus. Although such beads are generally rigid compared to the matrix, the material surrounding the beads typically differs from the matrix in one or two ways. The first case, as is common in mechanobiological experimentation, is the situation in which the bead must be coated with materials such as protein ligands that enable adhesion to the matrix. These layers typically differ in stiffness relative to the matrix material. The second case, common for uncoated beads, is the situation in which the beads disrupt the structure of the hydrogel or polymer, leading to a region of enhanced or reduced stiffness in the neighborhood of the bead. To address both cases, we developed the first analytical solution of the problem of translation of a coated, rigid spherical inclusion displaced within an isotropic elastic matrix by a remotely applied force. The solution is applicable to cases of arbitrary coating stiffness and size of the coating. We conclude by discussing applications of the solution to mechanobiology.
Keyword ：
coated inclusion force-displacement relationship magnetic bead rheometry translation of an inclusion
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| GB/T 7714 | Chen, X , Li, MX , Liu, SB et al. Translation of a Coated Rigid Spherical Inclusion in an Elastic Matrix: Exact Solution, and Implications for Mechanobiology [J]. | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2019 , 86 (5) : 051002 . |
| MLA | Chen, X et al. "Translation of a Coated Rigid Spherical Inclusion in an Elastic Matrix: Exact Solution, and Implications for Mechanobiology" . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 86 . 5 (2019) : 051002 . |
| APA | Chen, X , Li, MX , Liu, SB , Liu, FS , Genin, GM , Xu, F et al. Translation of a Coated Rigid Spherical Inclusion in an Elastic Matrix: Exact Solution, and Implications for Mechanobiology . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2019 , 86 (5) , 051002 . |
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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 ：
Absorption improvement Effective medium method Metamaterial Micro-perforated panel Stop band
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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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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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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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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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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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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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Abstract ：
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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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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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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