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  • Multiple time scales of fluvial processes—theory and applications
  • Fluvial processes comprise water flow,sediment transport and bed evolution,which normally feature distinct time scales.The time scales of sediment transport and bed deformation relative to the flow essentially measure how fast sediment transport adapts to capacity region in line with local flow scenario and the bed deforms in comparison with the flow,which literally dictates if a capacity based and/or decoupled model is justified.This paper synthesizes the recently developed multiscale theory for sediment-l...
  • Editorial
  • The progress of experimental mechanics is driven by the development of related disciplines and the requirement of industry.Some new methods and technologies have been developed and have found wide applications in engineering during the past decades,such as optical methods and
  • Quasi-static tensile deformation and fracture behavior of a highly particle-filled composite using digital image correlation method
  • Polymer bonded explosives (PBXs) are highly particle-filled composite materials.This paper experimentally studies the tensile deformation and fracture behavior of a PBX simulation by using the semi-circular bending (SCB) test.The deformation and fracture process of a pre-notched SCB sample with a random speckle pattern is recorded by a charge coupled device camera.The displacement and strain fields on the observed surface during the loading process are obtained by using the digital image correlation method....
  • Experimental investigation of interface curing stresses between PMMA and composite using digital speckle correlation method
  • This paper studies the interface curing stresses between polymethyl methacrylate (PMMA) and composite by means of digital speckle correlation method (DSCM).A new method by combining DSCM with the marker points is developed to measure the interface curing stresses,and the measurement principle is introduced.The interface curing stresses between PMMA and composite with different curing bonding conditions are measured and analyzed,this indicates that the residual stress for furnace heating and furnace cooling ...
  • The pre-stack migration imaging technique for damages identification in concrete structures
  • Pre-stack migration imaging (PMI) method,which is used in geophysical exploration by the performance of single side detection and visually display,can be used to identify the location,orientation,and severity of damages in concrete structure.In particular,this letter focuses on the experimental study by using a finite number of sensors for further practical applications.A concrete structure with a surface-mounted linear PZT transducers array is illustrated.Three types of damages,horizontal,dipping and V-sha...
  • Characterization of surface damage of a solid plate under tensile loading using nonlinear Rayleigh waves
  • This letter reports experimental observation of a direct correlation between the acoustic nonlinearity parameter (NP) measured with nonlinear Rayleigh waves and the accumulation of plasticity damage in an AZ31 magnesium alloy plate specimen.Rayleigh waves are generated and detected with wedge transducers,and the NPs are measured at different stress levels.The results show that there is a significant increase in the NPs with monotonic tensile loads surpassing the material‘s yielding stress.The research sugge...
  • Features of long-term health monitored strains of a bridge with wavelet analysis
  • This paper analyses the five years‘ monitored strains collected from a long-term health monitoring system installed on a bridge with wavelet transform.In the analysis,the monitored strains are pre-processed,features of the monitored data are summarized briefly.The influences of the base functions on the results of wavelet analysis are studied simultaneously.The results show that the db wavelet is a good mother wavelet function in the analysis,and the order N should be larger than 20,but less than 46 in deco...
  • Residual strain evaluation of curved surface by grating-transferring technique and GPA
  • This paper investigates an advanced grating-transferring technique combined with geometric phase analysis (GPA) for residual strain evaluation of curved surface.A standard holographic grating is first transferred to a pre-produced epoxy resin film and then consolidated to a test region of curved surface.With a rubber mold and silicone rubber the deformed grating is replicated to a sheet metal after hole-drilling for release of residual stress.After that the grating is transferred from the sheet metal to the...
  • Vibration parameter measurement using the temporal digital hologram sequence and windowed Fourier transform
  • Real time digital recording and numerical reconstruction of a temporal digital hologram sequence have become feasible in recent years.They provide a new measurement method which enjoys the valuable advantages of being full-field,noncontact and high precision.In this paper,a combined method of temporal digital hologram sequence and windowed Fourier transform is proposed to measure the kinematic parameters of random vibration.A series of holograms are recorded by CCD camera and the original phase can be recon...
  • Experimental investigation of high temperature thermal contact resistance with interface material
  • Thermal contact resistance plays a very important role in heat transfer efficiency and thermomechanical coupling response between two materials,and a common method to reduce the thermal contact resistance is to fill a soft interface material between these two materials.A testing system of high temperature thermal contact resistance based on INSTRON 8874 is established in the present paper,which can achieve 600 C at the interface.Based on this system,the thermal contact resistance between superalloy GH600 ma...
  • An efficient Galerkin meshfree formulation for shear deformable beam under finite deformation
  • This paper proposes a geometrically nonlinear total Lagrangian Galerkin meshfree formulation based on the stabilized conforming nodal integration for efficient analysis of shear deformable beam.The present nonlinear analysis encompasses the fully geometric nonlinearities due to large deflection,large deformation as well as finite rotation.The incremental equilibrium equation is obtained by the consistent linearization of the nonlinear variational equation.The Lagrangian meshfree shape function is utilized t...
  • Universal threshold of the transition to localized turbulence in shear flows
  • Experimental and numerical studies have shown similarities between localized turbulence in channel and pipe flows.By scaling analysis of a disturbed-flow model,this paper proposes a local Reynolds number Re M to characterize the threshold of transition triggered by finite-amplitude disturbances.The Re M represents the maximum contribution of the basic flow to the momentum ratio between the nonlinear convection and the viscous diffusion.The lower critical Re M observed in experiments of plane Poiseuille flow...
  • Solutions of Green s function for Lamb s problem of a two-phase saturated medium
  • The solutions of Green‘s function are significant for simplification of problem on a two-phase saturated medium.Using transformation of axisymmetric cylindrical coordinate and Sommerfeld‘s integral,superposition of the influence field on a free surface,authors obtained the solutions of a two-phase saturated medium subjected to a concentrated force on the semi-space.
  • Prandtl number effects in MRT lattice Boltzmann models for shocked and unshocked compressible fluids
  • This paper constructs a new multiple relaxation time lattice Boltzmann model which is not only for the shocked compressible fluids,but also for the unshocked compressible fluids.To make the model work for unshocked compressible fluids,a key step is to modify the collision operators of energy flux so that the viscous coefficient in momentum equation is consistent with that in energy equation even in the unshocked system.The unnecessity of the modification for systems under strong shock is analyzed.The model ...
  • A comparative study of hybrid electric vehicle fuel consumption over diverse driving cycles
  • Environmental pollution and declining resources of fossil fuels in recent years,have increased demand for better fuel economy and less pollution for ground transportation.Among the alternative solutions provided by researchers in recent decades,hybrid electric vehicles consisted of an internal combustion engine and an electric motor have been considered as a promising solution in the short-term.In the present study,fuel economy characteristics of a parallel hybrid electric vehicle are investigated by using ...
  • Quantitative modelling of viscoelasticity of isotropic fibrous composites with viscoelastic matrices
  • Despite the wide usage of isotropic fibrous composites with a viscoelastic polymer matrix,no analytic model for their mechanical behaviour is known.This paper develops such a model for time-dependent Young‘s modulus,showing that for typical constituents the time constants of composites are up to about 6% greater than the matrix shear time constant.Viscoelasticity is strongly suppressed for stiff fibres even at modest fibre volume fractions.Comparison with known results for particle and oriented fibre compos...
  • Propagation of liquid surface waves over finite graphene structured arrays of cylinders
  • Based on the multiple scattering method,this paper investigates a benchmark problem of the propagation of liquid surface waves over finite graphene (or honeycomb) structured arrays of cylinders.Comparing the graphene structured array with the square structured and with triangle structured arrays,it finds that the finite graphene structure can produce more complete band gaps than the other finite structures,and the finite graphene structure has less localized ability than the other finite structures.
  • Low-thrust trajectory optimization for multiple target bodies tour mission
  • Spacecraft science missions to planets or asteroids have historically visited only one or several celestial bodies per mission.The research goal of this paper is to create a trajectory design algorithm that generates trajectory allowing a spacecraft to visit a significant number of asteroids during a single mission.For the problem of global trajectory optimization,even with recent advances in low-thrust trajectory optimization,a full enumeration of this problem is not possible.This work presents an algorith...
  • Multiple time scales of fluvial processes—theory and applications
    Editorial
    Quasi-static tensile deformation and fracture behavior of a highly particle-filled composite using digital image correlation method
    Experimental investigation of interface curing stresses between PMMA and composite using digital speckle correlation method
    The pre-stack migration imaging technique for damages identification in concrete structures
    Characterization of surface damage of a solid plate under tensile loading using nonlinear Rayleigh waves
    Features of long-term health monitored strains of a bridge with wavelet analysis
    Residual strain evaluation of curved surface by grating-transferring technique and GPA
    Vibration parameter measurement using the temporal digital hologram sequence and windowed Fourier transform
    Experimental investigation of high temperature thermal contact resistance with interface material
    An efficient Galerkin meshfree formulation for shear deformable beam under finite deformation
    Universal threshold of the transition to localized turbulence in shear flows
    Solutions of Green s function for Lamb s problem of a two-phase saturated medium
    Prandtl number effects in MRT lattice Boltzmann models for shocked and unshocked compressible fluids
    A comparative study of hybrid electric vehicle fuel consumption over diverse driving cycles
    Quantitative modelling of viscoelasticity of isotropic fibrous composites with viscoelastic matrices
    Propagation of liquid surface waves over finite graphene structured arrays of cylinders
    Low-thrust trajectory optimization for multiple target bodies tour mission
    《力学快报:英文版》封面

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