کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
784977 | 1465353 | 2012 | 15 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A lower bound on snap-through instability of curved beams under thermomechanical loads A lower bound on snap-through instability of curved beams under thermomechanical loads](/preview/png/784977.png)
A non-linear finite element formulation (three dimensional continuum elements) is implemented and used for modeling dynamic snap-through in beams with initial curvature. We identify a non-trivial (non-flat) configuration of the beam at a critical temperature value below which the beam will no longer experience snap-through under any magnitude of applied quasi-static load for beams with various curvatures. The critical temperature is shown to successfully eliminate snap-through in dynamic simulations at quasistatic loading rates. Thermomechanical coupling is included in order to model a physically minimal amount of damping in the system, and the resulting post-snap vibrations are shown to be thermoelastically damped. We propose a test to determine the critical snap-free temperature for members of general geometry and loading pattern; the analogy between mechanical prestress and thermal strain that holds between the static and dynamic simulations is used to suggest a simple method for reducing the vulnerability of thin-walled structural members to dynamic snap-through in members of large initial curvature via the introduction of initial pretension.
► Determine the snap-through boundary of curved systems under thermomechanical loads.
► This limit also reduces the amplitude of the oscillations under transient loadings.
► An analytical test to determine this boundary is proposed.
Journal: International Journal of Non-Linear Mechanics - Volume 47, Issue 5, June 2012, Pages 561–575