ORCID Profile
0000-0002-0064-9796
Current Organisation
Tianjin University
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Publisher: Elsevier BV
Date: 07-2016
Publisher: Informa UK Limited
Date: 17-09-2015
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 02-2004
Publisher: MDPI AG
Date: 15-11-2019
DOI: 10.3390/MA12223761
Abstract: Interaction between dislocations and grain boundaries (GBs) in the forms of dislocation absorption, emission, and slip transmission at GBs significantly affects size-dependent plasticity in fine-grained polycrystals. Thus, it is vital to consider those GB mechanisms in continuum plasticity theories. In the present paper, a new GB model is proposed by considering slip transmission at GBs within the framework of gradient polycrystal plasticity. The GB model consists of the GB kinematic relations and governing equations for slip transmission, by which the influence of geometric factors including the misorientation between the incoming and outgoing slip systems and GB orientation, GB defects, and stress state at GBs are captured. The model is numerically implemented to study a benchmark problem of a bicrystal thin film under plane constrained shear. It is found that GB parameters, grain size, grain misorientation, and GB orientation significantly affect slip transmission and plastic behaviors in fine-grained polycrystals. Model prediction qualitatively agrees with experimental observations and results of discrete dislocation dynamics simulations.
Publisher: Springer Science and Business Media LLC
Date: 08-2017
Publisher: SAGE Publications
Date: 16-03-2009
Abstract: An impermeable interfacial crack problem in two dissimilar magnetoelectroelastic half planes has been solved in a compact form by Stroh formulism. The expression for energy release rate has been derived. By using the expression, the overall average properties of the composite have been established in relation to the interface crack density. Results indicate that the presence of interface cracks, as a whole, would deteriorate the coupling effects in the magnetoelectroelastic composites.
Publisher: Trans Tech Publications, Ltd.
Date: 05-2003
Publisher: Elsevier BV
Date: 2002
Publisher: Informa UK Limited
Date: 06-2004
Publisher: Informa UK Limited
Date: 05-2006
Publisher: Springer Science and Business Media LLC
Date: 12-04-2017
Publisher: ASME International
Date: 09-2003
DOI: 10.1115/1.1598476
Abstract: An analytical model is developed for a functionally graded interfacial zone between two dissimilar elastic solids. Based on the fact that an arbitrary curve can be approached by a continuous broken line, the interfacial zone with material properties varying continuously in an arbitrary manner is modeled as a multilayered medium with the elastic modulus varying linearly in each sublayer and continuous on the interfaces between sublayers. With this new multilayered model, we analyze the problem of a Griffith crack in the interfacial zone. The transfer matrix method and Fourier integral transform technique are used to reduce the mixed boundary-value problem to a Cauchy singular integral equation. The stress intensity factors are calculated. The paper compares the new model to other models and discusses its advantages.
Publisher: Springer Science and Business Media LLC
Date: 16-07-2010
Publisher: Springer Science and Business Media LLC
Date: 25-08-2005
Publisher: Wiley
Date: 08-02-2023
Abstract: Sliding onset is critical to interface failure or earthquake prediction, yet the physical mechanism is still unclear. In the present work, a model for the slender slider‐substrate system has been proposed. To account for sliding, nucleation of an interfacial dislocation and its subsequent mobility have been analyzed which may help clarify the sliding onset. The solution of this model can be simplified to that of Cauchy singular integral equations. Before the interfacial dislocation nucleation, numerical results thus obtained for interfacial tractions have been demonstrated to be in good consistency with experiments. By introducing a critical criterion for static dislocation nucleation, it has been found that the calculated critical force agrees well with that for sliding precursors and the mobility of the dislocation capture some essential features for the experimentally observed behaviours for sliding precursors. These results may cast new light to the occurrence and understanding of sliding onset.
Publisher: IOP Publishing
Date: 04-2011
DOI: 10.1088/0957-4484/22/22/225704
Abstract: Deformation mechanisms of carbon nanotube (CNT) fibres under tensile loading are studied by means of in situ Raman spectroscopy to detect the CNT deformation and stress distributions in the fibres. The G' band in the Raman spectrum responds distinctly to the tensile stress in Raman shift, width and intensity. The G' band changes with the tensile deformation of the fibre at different stages, namely elastic deformation, strengthening and damage-fracture. It is deduced that the in idual CNTs only deform elastically without obvious damage or bond breaking. The yield and fracture of fibres can be due to the slippage among the CNTs.
Publisher: IOP Publishing
Date: 05-2012
Publisher: Trans Tech Publications, Ltd.
Date: 04-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.503-504.455
Abstract: An energy-based model is presented to predict the deflection and resonance frequency shift of a microcantilever induced by chemisorption. The chemisorption of oxygen on Si(100) surface is taken as a representative ex le. The connection between the continuum-level cantilever responses (e.g. static deflection, resonance frequency) and the molecular-level interactions (covalent bond interactions) are established. The mechanical behavior of the cantilever on the density of adsorbed atoms/molecules and the property of the substrate is investigated. This study is helpful for designing microcantilever-based sensors which have many technologically important applications
Publisher: Elsevier BV
Date: 08-2003
Publisher: Springer Science and Business Media LLC
Date: 26-07-2013
Publisher: ASME International
Date: 16-04-2007
DOI: 10.1115/1.2424473
Abstract: By taking into account the effect of surface elasticity, the problem of a half plane under concentrated normal or shear loads is first considered. The solutions for the displacements or alternatively named surface Green’s functions can be obtained by using the Fourier integral transform technique. Based on such solutions, the elastic interaction between two surface steps that are modeled as force dipoles is further investigated. The results show that the effect of surface elasticity on the interaction energy is significant when the distance between the two steps is in the range of several times the intrinsic length scale of the system. Further, surface elasticity seems to influence the interaction between steps with force components parallel to the surface more strongly than that when the steps exhibit force components only normal to the surface.
Publisher: Springer Science and Business Media LLC
Date: 08-01-2013
Publisher: Elsevier BV
Date: 08-2005
Publisher: Elsevier BV
Date: 11-2013
Publisher: Springer Science and Business Media LLC
Date: 07-03-2006
Publisher: Elsevier BV
Date: 09-2004
Publisher: AIP Publishing
Date: 24-07-2006
DOI: 10.1063/1.2236102
Abstract: A model, where the interaction between adsorbates and the cantilever and that between the adsorbates themselves have been explicitly taken into account through Lennard-Jones potential, is developed to explain the adsorption-induced fundamental resonance frequency change of a cantilever. With the model, one can obtain results comparable to some experimental observations and predict results with implications for certain applications of resonant behavior of small-dimensioned cantilevers.
Publisher: Elsevier BV
Date: 12-2013
Publisher: Elsevier BV
Date: 04-2005
Publisher: AIP Publishing
Date: 07-2017
DOI: 10.1063/1.4992106
Abstract: (111) silicon is widely used in current microstructures. In this study, theoretical analysis shows that different states of elastic stress may result in different eigenvalues and their respective eigenvectors of the lattice dynamics secular equation. The key point in determining the spectral character is to obtain the Raman tensor corresponding to each eigenvector whose eigenvalue can be represented by a function of the stress tensor components. As ex les, the wavenumber–stress factors under some specific states of stress at typical polarization configurations were determined. Finally, a calibration experiment was performed to validate the theoretical prediction.
Publisher: Elsevier BV
Date: 10-2015
Publisher: AIP Publishing
Date: 15-07-2011
DOI: 10.1063/1.3610498
Abstract: In this work, the acoustic vibrations of a circular nanowire have been studied on the basis of surface elasticity model, where both the surface elastic property and surface inertia effect are captured. The phonon dispersion and the resonant frequencies for specific vibration modes have been calculated. It has been found from the numerical results that both the surface elastic property and the surface inertia have much effect on the vibration behavior of the nanowire, though depending on the vibration modes. The low-frequency Raman shift has also been considered. The results reveal the surface effect is significant in nanowires, which may make it possible to use Raman scattering to determine the surface properties.
Publisher: IOP Publishing
Date: 20-02-2008
DOI: 10.1088/0957-4484/19/12/125101
Abstract: Microtubules are hollow cylindrical filaments of a eukaryotic cytoskeleton which are sensitive to externally applied radial forces due to their low circumferential elastic modulus. In this work, an orthotropic elastic shell model for microtubules is used to study the surface radial deflection of a microtubule loaded by a concentrated radial force generated by either a single molecular motor or a radial indentation tip. Our results show that the maximum surface radial deflection of a microtubule generated by a concentrated radial force of a few pN can be as large as a few nanometers (a significant fraction of the radius of microtubules), which could cause significant surface morphological non-uniformity of the microtubule. In contrast, radial indentation under a much larger compressive force, which can be as large as a few hundreds of pN, will cause hardening of the circumferential elastic modulus almost equal to the longitudinal modulus of microtubules. In this case, our results show that a microtubule can withstand a concentrated radial compressive force as large as a few hundreds of pN, with a maximum radial deflection not more than a few nanometers, in good agreement with recent experiments on radial indentation of microtubules. These results offer useful data and new insights into the basic understanding of elastic interaction between microtubules and molecular motors and radial indentation of microtubules.
Publisher: Informa UK Limited
Date: 04-2013
Publisher: IOP Publishing
Date: 11-2014
Publisher: Informa UK Limited
Date: 04-2013
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2016
DOI: 10.1142/S1758825116500460
Abstract: Different mechanisms such as glide of lattice dislocation and grain boundary mediated processes may be active during the plastic deformation of polycrystals with small grain size. A continuum model for polycrystal plasticity has been developed to capture such a feature. Specifically, the strain gradient effect due to dislocation pile-up, dislocation emission/absorption at surface and grain boundary sliding have been taken into account from the perspective of energy storage. As an application of the model, a bicrystal under plane constrained shear has been considered. The dependence of yield strength on the thickness of the bicrystal has been investigated. It has been demonstrated the present model predicts the yield strength of the bicrystal first increases and then decrease with decrease in the thickness, which is similar to the inverse Hall–Petch behavior but with a different scaling. Such behavior is attributed to the transition in different dominant deformation mechanisms at different values of the thickness.
Publisher: IOP Publishing
Date: 02-02-2006
DOI: 10.1088/0957-4484/17/4/045
Abstract: Mechanical behaviour analysis plays an important role in the design of micro/nano-electromechanical system (MEMS/NEMS) devices for reliability. In this paper, the size-dependent mechanical properties of nanostructures are numerically studied with the finite element method (FEM) by developing a kind of surface element to take into account the surface elastic effect. This method is then applied to the investigation of the interaction between two pressurized nanovoids and the effective moduli of two-dimensional nanoporous material. The numerical results indicate that surface elasticity can significantly alter the nature of interaction forms and the effective moduli by inducing a strong size dependence in conventional results.
Publisher: Wiley
Date: 27-03-2013
DOI: 10.1111/FFE.12043
Publisher: Springer Science and Business Media LLC
Date: 27-09-2013
Publisher: Wiley
Date: 07-02-2006
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 03-2018
Publisher: Oxford University Press (OUP)
Date: 27-06-2013
DOI: 10.1093/GJI/GGT201
Abstract: In this study, damage evolution and strain localization in sandstone have been experimentally investigated in uniaxial compression tests. A digital image correlation technique has been applied to obtain apparent strain fields which can visually display the deformation and damage evolution of rock. The experimental results show that regions with apparent strain concentration (RASC) develop at the initial loading stage and distribute diffusely on the s le surface which may correspond to the damaged areas. With incremental load, the RASCs localize spatially, probably via coalescence into a line-shaped area that behaves like a macroscopic crack leading to the eventual failure of the specimen. A factor DRASC representing the deviation of the average apparent strain in RASCs from the average on the whole s le surface and a localization factor Lf, are proposed to characterize the evolution of damage and localization. DRASC increases slowly in the initial phase of loading and rises rapidly after the onset of localization. Lf decreases during loading which indicate the localization of spatial distribution of damage. The two factors can be used to well reflect the damage evolution and strain localization of rock specimens under compression.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.528.229
Abstract: Atomic/molecular adsorption on a microcantilever surface can cause the cantilever to deflect as a result of the adsorption-induced surface stress. In this paper, based on atomic/molecular interactions, an energy-based model is proposed to calculate the chemisorption-induced surface stress. The connection between the chemisorption-induced surface stress and the covalent bond interactions is established. The results are consistent with relevant experimental observations. This study is helpful for characterizing and optimizing the mechanical response of cantilever-based sensors.
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 08-2008
DOI: 10.1016/J.JBIOMECH.2008.05.028
Abstract: A sticky chain model has been proposed to describe the unfolding of spectrin network under applied mechanical loads. With the model, the response of a red blood cell (RBC) under static and cyclic shear loading has been predicted, which agrees qualitatively with relevant experimental results.
Publisher: Elsevier BV
Date: 11-2021
Publisher: The Royal Society
Date: 2019
Abstract: A generalized double-Hertz (D-H) model has been proposed to consider the adhesive contact between an elastic cylinder and an elastic half space under inclined forces. The normal traction is exactly the same as that in the conventional D-H model. The shear traction of finite value is distributed into a slipping zone and a non-slipping zone. In the slipping zone, the shear traction is proportional to the compressive pressure. With the model, adhesive contact behaviour between cylinders has been numerically illustrated. The shear-induced peeling has been demonstrated. The value of the ratio for shear traction to normal traction larger than friction coefficient has been found in part of the non-slipping zone. Those altogether are consistent with experiments.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Springer Science and Business Media LLC
Date: 02-08-2015
Publisher: Elsevier BV
Date: 07-2009
Publisher: Springer Science and Business Media LLC
Date: 2004
Publisher: Springer Science and Business Media LLC
Date: 09-2002
Publisher: Elsevier BV
Date: 12-2012
Publisher: Springer Science and Business Media LLC
Date: 08-2001
No related grants have been discovered for Ganyun Huang.