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Vibration characteristics and machining performance of a novel perforated ultrasonic vibration platform in the grinding of particulate-reinforced titanium matrix composites

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0730-2

Abstract: A modified apparent elasticity method (AEM) was proposed to reveal the influence of holes on the vibration

Keywords： ultrasonic vibration-assisted grinding perforated ultrasonic vibration platform vibration characteristics apparentelasticity method grinding force surface integrity

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Empirical models and design codes in prediction of modulus of elasticity of concrete

Behnam VAKHSHOURI, Shami NEJADI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1, Pages 38-48 doi: 10.1007/s11709-018-0479-1

Abstract: Modulus of Elasticity (MOE) is a key parameter in reinforced concrete design.

Keywords： modulus of elasticity normal strength normal weight concrete empirical models design codes compressive

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Yue’s solution of classical elasticity in

Zhong-qi Quentin YUE

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 3, Pages 215-249 doi: 10.1007/s11709-015-0298-6

Abstract: The mathematical theory of linear elasticity is one of the most classical field theories in mechanicsFor more than 150 years from 1838 to present, one of the remaining key tasks in classical elasticityThe boundary-value problems of classical elasticity in -layered and graded solids are also one of theIn particular, he has derived the exact and complete fundamental singular solutions for elasticity ofverification of the solutions and further applications for exact and complete solutions of other problems in elasticity

Keywords： elasticity solution layered solid graded material

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Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators

Hamid M. SEDIGHI, Hassen M. OUAKAD

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6, Pages 1520-1530 doi: 10.1007/s11709-020-0672-x

Abstract: In this study, for the first time, we investigate the nonlocality superimposed to the size effects on the nonlinear dynamics of an electrically actuated single-walled carbon-nanotube-based resonator. We undertake two models to capture the nanostructure nonlocal size effects: the strain and the velocity gradient theories. We use a reduced-order model based on the differential quadrature method (DQM) to discretize the governing nonlinear equation of motion and acquire a discretized-parameter nonlinear model of the system. The structural nonlinear behavior of the system assuming both strain and velocity gradient theories is investigated using the discretized model. The results suggest that nonlocal and size effects should not be neglected because they improve the prediction of corresponding dynamic amplitudes and, most importantly, the critical resonant frequencies of such nanoresonators. Neglecting these effects may impose a considerable source of error, which can be amended using more accurate modeling techniques.

Keywords： velocity gradient elasticity theory nanotube resonators differential-quadrature method nonlinear vibration

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Real time monitoring for analysis of dam stability: Potential of nonlinear elasticity and nonlinear dynamics

T. CHELIDZE, T. MATCHARASHVILI, V. ABASHIDZE, M. KALABEGISHVILI, N. ZHUKOVA

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2, Pages 188-205 doi: 10.1007/s11709-013-0199-5

Abstract: Large dams are complex structures with nonlinear dynamic behavior. Engineers often are forced to assess dam safety based on the available incomplete data, which is extremely difficult. This important problem can be solved with the modern theory of complex systems. It is possible to derive characteristics of the whole unknown dynamics of a structure using few data sets of certain carefully selected representative parameter(s). By means of high quality continuous records of some geotechnical characteristic(s) of a dam and modern methods of time series linear/nonlinear analysis the main dynamical features of the entire, unknown process (here—dam deformation) can be analyzed. ?We created the cost-effective Monitoring Telemetric System for Dam Diagnostics (DAMWATCH), which consists of sensors (tiltmeters), terminal and central controllers connected by the GSM/GPRS Modem to the diagnostic center. The tilt data recorded for varying reservoir level are compared with static design model of dam deformations computed by a finite element method (FEM) for the dam-reservoir-foundation system. Besides, recently developed linear/nonlinear data analysis and prediction schemes may help to quantify fine dynamical features of the dam behavior. The software package DAMTOOL has been developed for this purpose. ?The differences between measured and theoretically predicted response parameters of the dam may signal abnormal behavior of the object. The data obtained already by testing of the DAMWATCH/DAMTOOL system during operation of the high Enguri arc dam and reservoir (Georgia) show interesting long-term and short-term patterns of tilts in the dam body, which can be used for dam diagnostics. The proposed real-time telemetric monitoring (DAMWATCH) complex and linear/nonlinear dynamical analysis system (DAMTOOL) are unique.

Keywords： real time monitoring telemetry dam tilts diagnostic tools hysteresis nonlinear dynamics

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Axisymmetric loading on nanoscale multilayered media

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1, Pages 152-164 doi: 10.1007/s11709-022-0895-0

Abstract: A Gurtin–Murdoch continuum model of surface elasticity is implemented to establish a computational scheme

Keywords： functionally graded layer Gurtin–Murdoch surface elasticity multilayered medium size dependency stiffness

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Determination of the Apparent Gas Permeability in a Macrocracked Concrete Article

Pierre Rossi

Engineering 2022, Volume 17, Issue 10, Pages 93-98 doi: 10.1016/j.eng.2020.11.008

Abstract:

This paper reports on analysis of an experimental study that aimed to determine the apparent gas permeabilityAnalytical functions between the evolution of the apparent crack permeability and the apparent crack

Keywords： Concrete Macrocrack Gas transfer Permeability

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Expressions for Differential and Apparent Coefficients of Static Friction

Wang Weiyuan

Strategic Study of CAE 2001, Volume 3, Issue 8, Pages 29-32

Abstract: On macro scale, the friction force is proportional to load, the apparent coefficients of static frictionthe definition of differential coefficients of static friction, the expressions for differential and apparent

Keywords： differential coefficients of static friction coefficients of static friction on micro or nano scale apparent

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Effect of denitrifying bacteria on the electrochemical reaction of activated carbon fiber in electrochemical biofilm system

YING Diwen, JIA Jinping, ZHANG Lehua

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 3, Pages 305-310 doi: 10.1007/s11783-007-0051-z

Abstract: Additionally, a parameter of apparent exchange current density was deprived from the cathodal polarization

Keywords： ACF apparent exchange hydrogen molecule activated biological process

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Thermo-elastic extended meshfree method for fracture without crack tip enrichment

A. ASADPOUR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4, Pages 441-447 doi: 10.1007/s11709-015-0319-5

Abstract: This is the first manuscript presenting an extended meshfree method for thermo- elastic fracture which does not exploit a crack tip enrichment. The crack is modeled by partition of unity enrichment of the displacement and temperature field. Only a step function is employed that facilitates the implementation. To ensure that crack tip is at the correct position, a Lagrange multiplier field ahead of the crack tip is introduced along a line. The Lagrange multiplier nodal parameters are discretised with the available meshfree functions. Two benchmark examples illustrate the efficiency of the method.

Keywords： meshfree method thermo-elasticity

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Synthesis of TiO2 nano-particles and their photocatalytic activity for formaldehyde and methyl orange degradation

XIAO Xinyan, ZHANG Huiping, CHEN Huanqin, LIAO Dongliang

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 2, Pages 178-183 doi: 10.1007/s11705-007-0033-5

Abstract: A simplified model was developed to evaluate the apparent quantum efficiency (Φapp) of this photocatalytic

Keywords： prepared photocatalytic activity apparent photocatalytic orthogonal

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Strength reduction factors for structural rubbercrete

Bashar S. MOHAMMED,N. J. AZMI

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 3, Pages 270-281 doi: 10.1007/s11709-014-0265-7

Abstract: content, unit weight, compressive strength, flexural strength, splitting tensile strength and modulus of elasticityfactors (RFs) for compressive strength, flexural strength, splitting tensile strength and modulus of elasticity

Keywords： crumb rubber recycled tire mix design reduction factor strength modulus elasticity

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Fabrication of titania thin film with composite nanostructure and its ability to photodegrade rhodamine B in water

ZHANG Gaojie, WU Jinming, LIU Shaoguang, YAN Mi

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1, Pages 44-48 doi: 10.1007/s11705-008-0001-8

Abstract: The apparent photodegradation rate constant, fitting a pseudo-first-order, was 3 times of that obtained

Keywords： constant weight apparent photodegradation hydrogen nanorod

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Impact of inter-fuel substitution on energy intensity in Ghana

Boqiang LIN, Hermas ABUDU

Frontiers in Energy 2020, Volume 14, Issue 1, Pages 27-41 doi: 10.1007/s11708-019-0656-5

Abstract: Energy intensity and elasticity, together with inter-fuel substitution are key issues in the currentcurrent energy dynamics reveal the expected inverse relationship: higher energy intensity and lower elasticity

Keywords： energy intensity energy elasticity inter-fuel substitution prospects energy contribution Translog production

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Linear and nonlinear elastic analysis of closely spaced strip foundations using Pasternak model

Priyanka GHOSH, S. RAJESH, J. SAI CHAND

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2, Pages 228-243 doi: 10.1007/s11709-016-0370-x

Abstract: In this study, an attempt is made to determine the interaction effect of two closely spaced strip footings using Pasternak model. The study considers small strain problem and has been performed using linear as well as nonlinear elastic analysis to determine the interaction effect of two nearby strip footings. The hyperbolic stress-strain relationship has been considered for the nonlinear elastic analysis. The linear elastic analysis has been carried out by deriving the equations for the interference effect of the footings in the framework of Pasternak model equation; whereas, the nonlinear elastic analysis has been performed using the finite difference method to solve the second order nonlinear differential equation evolved from Pasternak model with proper boundary conditions. Results obtained from the linear and the nonlinear elastic analysis are presented in terms of non-dimensional interaction factors by varying different parameters like width of the foundation, load on the foundation and the depth of the rigid base. Results are suitably compared with the existing values in the literature.

Keywords： bearing capacity linear and non-linear elasticity foundation interaction effect numerical modeling Pasternak

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Title Author Date Type Operation

Vibration characteristics and machining performance of a novel perforated ultrasonic vibration platform in the grinding of particulate-reinforced titanium matrix composites

Journal Article

Empirical models and design codes in prediction of modulus of elasticity of concrete

Behnam VAKHSHOURI, Shami NEJADI

Journal Article

Yue’s solution of classical elasticity in

Zhong-qi Quentin YUE

Journal Article

Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators

Hamid M. SEDIGHI, Hassen M. OUAKAD

Journal Article

Real time monitoring for analysis of dam stability: Potential of nonlinear elasticity and nonlinear dynamics

T. CHELIDZE, T. MATCHARASHVILI, V. ABASHIDZE, M. KALABEGISHVILI, N. ZHUKOVA