In this paper the conjugate gradient (CG) method is employed for identifying the parameters of crack in a functionally graded beam from natural frequency measurement. The crack is modeled as a massless rotational spring with sectional flexibility. By using the Euler-Bernoulli beam theory on two separate beams respectively and applying the compatibility requirements of the crack, the characteris...

Atomic force microscope (AFM) has been developed at first for topography imaging; in addition, it is used for characterization of mechanical properties. Most researches have been primarily focused on rectangular single-beam probes to make vibration models simple. Recently, the U-shaped AFM probe is employed to determine sample elastic properties and has been developed to heat samples locally. I...

This paper aims to investigate the pull-in phenomenon of functionally graded (FG) capacitive nanocantilevers subjected to an electrostatic force and thermal moment due to an applied voltage and thermal shock considering intermolecular force within the framework of nonlocal elasticity theory to account for the small scale effect. The FG nano-beam is made of mixture of metal and ceramic which the...

Buckling analysis of a functionally graded (FG) nanobeam resting on two-parameter elastic foundation is presented based on third-order shear deformation beam theory (TOSDBT). The in-plane displacement of TOSDBT has parabolic variation through the beam thickness. Also, TOSDBT accounts for shear deformation effect and verifies stress-free boundary conditions on upper and lower faces of FG nanobea...

The continuous rigid frame bridge of Jiagai River Bridge is (100 + 192 100) m, with a main span 192m, which will break the historical record 176m Chaoyang Jialing and become largest single track railway in China. has characteristics large load, poor stability high prestress requirements. temperature difference sunlight produce deformation emperature stress concrete box girder bridge, affect lin...

It is well known that bending and stretching modes of deformation in linearly-elastic plates decouple at leading order in thickness provided that the mid-plane is a plane of reflection symmetry of the three-dimensional material properties. This situation being the exception rather than the norm, it is important to have a model that accommodates coupling in a manner consistent with the threedime...

In many applications there is a need for high position resolution VUV and UV imagers. For these applications we have developed and successfully tested 1D and 2D VUV imaging detectors based on microgap RPCs. Two versions of these detectors were extensively tested: one filled with photosensitive vapours and the other one with the GaAs cathode coated by a 400 nm thick CsI layer. The main feature o...

A steel-concrete beam was taken as the study object. The algorithm of selecting number stiff supports for loaded with a concentrated lateral force in middle span has been refined. Stiff served to join steel strip concrete ensure their joint performance. refined based on condition equality longitudinal from action calculated load and maximum obtained after setting supports. In this case, forces ...

This paper presents an analytical refined beam model taking into account the axial, shear and transverse normal stress distributions. Based on equilibrium equations in local form iterative procedure for solution of bipotential equation, differential axial motion are derived. From a mathematical point view formal structure obtained is identical to Timoshenko but with increased accuracy. achieved...

The crystal structure of the complex pi-AlFeMgSi phase, which was previously thought to have the composition Al(8)FeMg(3)Si(6), has been investigated. Microprobe analysis revealed that the phase has a different composition, Al(9)FeMg(3)Si(5). The space group was determined and confirmed to be P62m with the use of parallel-beam electron diffraction (SAD) and convergent-beam electron diffraction ...