Presentation is loading. Please wait.

Presentation is loading. Please wait.

Meshing/elements in Abaqus

Similar presentations


Presentation on theme: "Meshing/elements in Abaqus"— Presentation transcript:

1 Meshing/elements in Abaqus
Accuracy of an Abaqus analysis strongly depends on the element type , mesh density and thickness elements. During a study on a thin- flat plate with different loading conditions , significantly different results were obtained depending on the number of thickness elements used. Problems : - Since reduced integration elements were used , a fine mesh in the bending direction was necessary. - Only 2 elements were present along the thickness. - Hence Asymmetric behavior at the edges was noticed and a 12% error existed between numerical and analytic results Fig. 1. Flat Plate under uniform loading with 2 elements through the thickness 9/17/2018 Srisharan.G.Govindarajan

2 Srisharan.G.Govindarajan
Fig. 3. Flat plate after mesh refinement along the thickness Fig. 2. Finer mesh along the thickness - Error reduced to less than 1% with a finer mesh along the thickness. - It was observed that for an analysis using reduced integration elements in Abaqus , there exists an optimum value for the number of thickness elements. - To obtain a mesh independent solution , this optimum value was maintained a constant and the global seed was changed to vary the overall mesh density. 9/17/2018 Srisharan.G.Govindarajan

3 Srisharan.G.Govindarajan
Table 1. Types of Abaqus elements Incompatible mode elements Fully integrated linear elements Reduced integration linear elements Best of the linear elements Can represent bending behavior well if they are not distorted Element edges should be parallel and normal to the direction of bending Eg : Cantilever beam bending analysis They are too stiff in bending Suffer from ‘shear -locking’ . Should not be used if the model is to respond in bending. Eg : Useful in simple problems , contact simulations and fully coupled thermal stress problems. They are less stiff in bending Suffer from ‘hourglassing’. This can be overcome by using a really fine mesh in the bending direction. Eg : Can be used in thin plate bending/deflection analysis , heat transfer problems . 9/17/2018 Srisharan.G.Govindarajan


Download ppt "Meshing/elements in Abaqus"

Similar presentations


Ads by Google