Difference between revisions of "Contrib:KeesWouters/plasticity"

Revision as of 14:15, 12 August 2009

V shaped construction under plastic deformation

The V shaped is defined by an extrusion of a V shaped face.

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Three planes are defined in the geometry: Pleft and Pright for applyind boundary conditions (dx=dy=dz=0) and Pforce for defining a prescribed displacement in y direction.

The definition of the geometry as well as the meshing is given in the Python input file.
In the geometry module of Salome select File --> Load Script (or ctrl T) and thereafter the file: Media:kw_gm_vshape.zip.

General procedure of the calculation

The general procedure of the calculation is as follows:

• read the mesh
• apply the non linear material properties of the construction
• define the boundary conditions
• define the maximum load, in this case a maximum displacement at the plane Pforce
• define 'time' and 'load' increments:

the time is defined from 0.0 to 2.1 and stepsize 0.1 s, yielding 21 points.

The load multiplication factor is defined by ramping from 0.0 to 1.0 during the first 1 s,

then keep it constant at 1.0 for 0.1 s and

decreasing from 1.0 to 0.0 in the last second.

• perform the analysis
• define results in a med-file for Salome, in this case, displacements, vonMises and plastic stresses
• print results in a file, notably the displacements of the plane Pforce and its corresponding forces.

In the figure the results of four load cycles are given: the maximum displacement of each calculation is 0.080, 0.085, 0.095 and 0.100 mm. The plastic deformation at a load free construction after the load cycle is roughly 0.005, 0.009, 0.018 and 0.022 mm.
Each dot in the curves indicate a output point of the calculation. In most case 21 points are given, these have been defined in the 'time' increment function.

tbc