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Fracture behavior of two non-symmetrical collinear cracks emanating from an elliptical hole in a piezoelectric material

Junhong GUO, Zixing LU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 296-300 doi: 10.1007/s11465-011-0236-9

Abstract: energy release rate are presented in closed-form, which includes the extreme cases for an impermeable crackand a permeable crack.Numerical results are then presented to reveal the effects of geometrical parameters, crack permeability

Keywords： piezoelectric materials elliptical hole semi-permeable crack energy release rate analytic solution

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Numerical modeling and performance evaluation of passive convergence-permeable reactive barrier (PC-PRB

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 11, doi: 10.1007/s11783-023-1731-z

Abstract:

● A 2D finite-element solute transport model, PRB-Trans, is developed.

Keywords： Passive convergence-permeable reactive barrier Numerical modeling Hydraulic behavior assessment Pollutant

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Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 12, doi: 10.1007/s11783-022-1591-y

Abstract:

● A novel PRB configuration based on passive convergent flow effect was proposed.

Keywords： Passive convergence-permeable reactive barrier (PC-PRB) Permeable reactive barrier configuration Numerical

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Effect of a less permeable stronger soil layer on the stability of non-homogeneous unsaturated slopes

Nabarun DEY, Aniruddha SENGUPTA

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6, Pages 1462-1475 doi: 10.1007/s11709-020-0674-8

Abstract: of centrifuge experiments and numerical analyses on a 55° inclined unsaturated sandy slope with less permeableIt is observed that a less permeable, stronger silty sand layer in an otherwise homogeneous sandy soilThe factor of safety of a non-homogeneous, unsaturated soil slope decreases because of the less permeableIt decreases significantly if this less permeable, stronger soil layer is located near the toe of the

Keywords： non-homogeneous slope stronger soil layer factor of safety centrifuge model test unsaturated soils

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Micromixing performance of the teethed high shear mixer under semi-batch operation

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 4, Pages 546-559 doi: 10.1007/s11705-021-2069-3

Abstract: Semi-batch operated reaction processes are necessary for some competitive reaction systems to achieveparameters of the teethed high shear mixers were adjusted to study the micromixing performance in the semi-batchcarried out to disclose the evolution of the flow pattern and turbulent energy dissipation rate of the semi-batchparameters studied in this work, which can provide valuable guidance on the design and optimization of the semi-batch

Keywords： high shear mixer semi-batch operation micromixing performance Villermaux/Dushman system segregation

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Dynamic crack propagation in plates weakened by inclined cracks: an investigation based on peridynamics

A. SHAFIEI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 527-535 doi: 10.1007/s11709-018-0450-1

Abstract: In this paper by using peridynamics, the crack path for inclined crack under dynamic loading were investigatedThe peridynamics solution for this problem represents the main features of dynamic crack propagationsuch as crack bifurcation.In addition, the influence of geometry on inclined crack growth is studied.

Keywords： peridynamics inclined crack dynamic fracture crack branching

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Bending and rotational behaviour of semi-continuous composite beams

WANG Jingfeng, LI Guoqiang

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 2, Pages 116-122 doi: 10.1007/s11709-008-0015-9

Abstract: Stresses and deflections were measured in various semi-continuous composite beams.composite connections were measured in terms of beam curvatures and deflections by using two full-scale semi-rigidThe effect of semi-rigid connections on the performance of composite beams with various loadings wasThe tests show that the semi-continuous composite beams are more economic and effective than the simpleThe semi-rigid connections affect the bending capacities and beam deflections, so the connection behavior

Keywords： rotational effective deflection calculation semi-continuous composite full-scale semi-rigid

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Moisture diffusion behavior of permeable fiber-reinforced polymer composite

Jianjiang YANG, Qingsheng YANG, Lianhua MA, Wei LIU,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 3, Pages 347-352 doi: 10.1007/s11465-010-0093-y

Abstract: The permeable fibers distributed in the matrix are taken as inclusion phases in the system.

Keywords： fiber-reinforced biopolymer effective diffusion coefficient unit cell finite element modeling (FEM)

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Peridynamics versus XFEM: a comparative study for quasi-static crack problems

Jinhai ZHAO, Hesheng TANG, Songtao XUE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 548-557 doi: 10.1007/s11709-017-0434-6

Abstract: However, capturing of complex mixed-mode crack patterns has been proven to be difficult with PD.extended finite element method (XFEM) is one of the most popular methods for fracture which allows crackThe first example is crack propagation in a double notched specimen under uniaxial tension with differentcrack spacings in loading direction.

Keywords： XFEM peridynamic bilateral crack parallel double cracks nonlocal theory

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Correlation between tension softening relation and crack extension resistance in concrete

Xiufang ZHANG , Shilang XU ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3, Pages 323-329 doi: 10.1007/s11709-009-0041-2

Abstract: Changes of the material fracture energy consumption with crack propagation can be described by a crackextension resistance curve, one of the fundamental fracture criteria in crack mechanics.observation of the fracture behavior in concrete was used to develop a new fracture criterion, the crackextension resistance curve, to analyze crack propagation during the entire concrete fracture processfracture process zone ahead of the stress-free crack tip.

Keywords： concrete fracture process zone crack extension G_R resistance tension softening curve

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Magnetohydrodynamic slip flow and diffusion of a reactive solute past a permeable flat plate with suction

Krishnendu BHATTACHARYYA, G. C. LAYEK

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 4, Pages 471-476 doi: 10.1007/s11705-011-1130-z

Abstract: The magnetohydrodynamic (MHD) boundary layer slip flow and solute transfer over a porous plate in the presence of a chemical reaction are investigated. The governing equations were transformed into self-similar ordinary differential equations by adopting the similarity transformation technique. Then the numerical solutions are obtained by a shooting technique using the fourth order Runge-Kutta method. The study reveals that due to the increase in the boundary slip, the concentration decreases and the velocity increases. On the other hand, with an increase in the magnetic field and mass suction, both boundary layer thicknesses decreased. As the Schmidt number and the reaction rate parameter increases, the concentration decreases and the mass transfer increases.

Keywords： slip flow MHD boundary layer reactive solute diffusion flat plate suction/injection

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Fracture resistance on aggregate bridging crack in concrete

ZHANG Xiufang, XU Shilang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 1, Pages 63-70 doi: 10.1007/s11709-007-0006-2

Abstract: Utilizing the obtained load against crack opening displacement curve, the value of G at any crack extensionas well as the change of G with the crack extension is examined.It is found that G will firstly increase with the development of crack and then stay constant once theinitial crack tip opening displacement reaches the characteristic crack opening displacement w0.The results reveal that the values of G of different specimens at any crack propagation are strongly

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Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2, Pages 203-213 doi: 10.1007/s11465-011-0131-4

Abstract:

Crack on a shaft is one of the common damages in a rotor system.slant crack on the rotor system.is larger than that with a transverse crack when the two types of crack have the same depth and thetorsional excitation are analyzed by considering opening and closing of the crack.on a shaft and can be used for the detection of the slant crack on a shaft.

Keywords： rotor dynamics slant crack stability torsional excitation open and close

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Prediction of the theoretical and semi-empirical model of ambient temperature

Foued CHABANE,Noureddine MOUMMI,Abdelhafid BRIMA,Abdelhafid MOUMMI

Frontiers in Energy 2016, Volume 10, Issue 3, Pages 268-276 doi: 10.1007/s11708-016-0413-y

Abstract: It is well known that the ambient temperature is a sensitive parameter which has a great effect on biology, technology, geology and even on human behavior. A prediction is a statement about an uncertain event. It is often, but not always, based upon experience or knowledge. Although guaranteed accurate information about the future is in many cases impossible, prediction can be useful to assist in making plans about possible developments. As a result, temperature profiles can be developed which accurately represent the expected ambient temperature exposure that this environment experiences during measurement. The ambient temperature over time is modeled based on the previous and data and using a Lagrange interpolation. To observe the comprehensive variation of ambient temperature the profile must be determined numerically. The model proposed in this paper can provide an acceptable way to measure the change in ambient temperature.

Keywords： ambient temperature environment correlation theoretical model semi-empirical

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Study on the cohesion and adhesion of hot-poured crack sealants

Meng GUO, Yiqiu TAN, Xuesong DU, Zhaofeng LV

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 3, Pages 353-359 doi: 10.1007/s11709-017-0400-3

Abstract: Filling crack sealant is a main method to repair cracking of pavement.The cohesion and adhesion of crack sealant directly determine its service performance and durability.This research proposed two methods to evaluate cohesion and adhesion of crack sealant, and analyzed theThe effect of moisture on low-temperature performance of crack sealant was also be evaluated by conductingfor 24 hours will decrease the failure energy of low-temperature tension and damage the durability of crack

Keywords： crack sealant concrete pavement cohesion adhesion moisture damage