نتایج جستجو برای: nonlinear axial strain

تعداد نتایج: 478556  

Journal: :international journal of optimaization in civil engineering 0
m. rezaiee-pajand r. naserian

by minimizing the total potential energy function and deploying the virtual work principle, a higher-order stiffness matrix is achieved. this new tangent stiffness matrix is used to solve the frame with geometric nonlinear behavior. since authors’ formulation takes into account the higher-order terms of the strain vector, the convergence speed of the solution process will increase. in fact, bot...

In this paper, the dynamic response of resonating nano-beams is investigated using a strain gradient elasticity theory. A nonlinear model is obtained based on the Galerkin decomposition method to find the dynamic response of the investigated beam around its statically deflected position. The mid-plane stretching, axial residual stress and nonlinear interaction due to the electrostatic force on ...

This study investigates the time-dependent long-term creep strain in a composite cylinder made of glass/vinylester with a unidirectional ply. The cylinder is subjected to an internal pressure and the boundary condition is free–free and acts as thermal insulation. The classical lamination theory (CLT) is used to derive the governing equations as a second-order equation to determine the radial, c...

In this work, the nonlinear buckling and post-buckling behavior of shallow arches made of Shape Memory Alloy (SMA) is investigated. Arches are susceptible to large deflections, due to their slenderness, especially when the external load exceeds the serviceability limit point. Beyond this, loss of stability may occur, the famous snap-through buckling. For this reason, curved beams can be used in...

Journal: :Physical review letters 2006
Haiyi Liang Moneesh Upmanyu

Using classical molecular dynamics and empirical potentials, we show that the axial deformation of single-walled carbon nanotubes is coupled to their torsion. The axial-strain-induced torsion is limited to chiral nanotubes-graphite sheets rolled around an axis that breaks its symmetry. Small strain behavior is consistent with chirality and curvature-induced elastic anisotropy (CCIEA)-carbon nan...

H Hatami M Hosseini,

This paper derives kinematic admissible bending moment – axial force (M-P) interaction relations for mild steel by considering strain hardening idealisations. Two models for strain hardening – Linear and parabolic have been considered, the parabolic model being closer to the experiments. The interaction relations can predict strains, which is not possible in a rigid, perfectly plastic idealizat...

Journal: :international clinical neurosciences journal 0
seifollah gholampour deptartment of bimedical engineering, north tehran branch, islamic azad university, tehran, iran nikoo soleimani m.sc. student of biomechanical engineering, department of biomedical engineering, north tehran branch, islamic azad university, tehran, iran. ali reza zalii shohada tajrish neurosurgical center of excellence, functional neurosurgery research center, shohada tajrish hospital, shahid beheshti university of medical sciences, tehran, iran. fateme zare karizi m.sc. student of biomechanical engineering, department of biomedical engineering, north tehran branch, islamic azad university, tehran, iran. afsoun seddighi shohada tajrish neurosurgical center of excellence, functional neurosurgery research center, shohada tajrish hospital, shahid beheshti university of medical sciences, tehran, iran

background: cervical spine sustains most of thevertebral column injuries, among other injuries, the disc degeneration and damage that lead to replacement of the damaged disc with cage or artificial disc. methods: the c4 to c6 vertebrae of a normal subject and a person with interbody fusion cage were 3d modelled and then analyzed using finite element method. the results of maximum stress and str...

Journal: :Journal of biomechanical engineering 2007
Stephen M Klisch

A strain energy function for finite deformations is developed that has the capability to describe the nonlinear, anisotropic, and asymmetric mechanical response that is typical of articular cartilage. In particular, the bimodular feature is employed by including strain energy terms that are only mechanically active when the corresponding fiber directions are in tension. Furthermore, the strain ...

Journal: :IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 2019

F Sohani H.R Eipakchi,

In the presented paper, the governing equations of a vibratory beam with moderately large deflection are derived using the first order shear deformation theory. The beam is homogenous, isotropic and it is subjected to the dynamic transverse and axial loads. The kinematic of the problem is according to the Von-Karman strain-displacement relations and the Hook's law is used as the constitutive eq...

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