This normally leads to a relatively small over prediction of displacements, whereas for stresses and strains errors are limited to a small zone around the points of application of load and reactions. In the finite-element solution, which is an approximation of the exact mathematical one, the stress would not be infinite, but as the mesh is refined around the points of application of load and reactions, the stress at these points would always increase, and tend to infinity as the element size tends to zero. In the case of a linear elastic analysis, these concentrated forces would result in infinite values of the stresses at such points in the exact mathematical solution. An alternative method could be the application of a downward displacement only at one point at the mid span, and prescribe the vertical displacements only on two points at the supports, which would generate concentrated forces. Abaqus 6.13 full crack free how to#1.1 How to apply the actual load? Modelling the contact between rollers and beams allows an easier and more accurate representation of the actual load applied on the flat bar by the rollers, both in the middle and on the supports. Hence, we can study the problem with a 2D model. The width-to-depth (200/20=10) of the cross section can be considered large enough to assume a state of plane stress is a good enough approximation. The testing rig uses 3 60mm steel rollers, as shown in the figure below, and the test is conducted by prescribing the displacement of the top roller.įigure 1: geometry and boundary conditions. The problem We want to study a 500x20x200mm3 aluminium flat bar loaded in 3-point bending. ME5554/ME5305 – Tutorial on a 2D Problem with Plasticity and Contact 1.
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