PORTUGUÊS INGLÊS ESPANHOL 886/5000
I am using the ANSYS program, via the APDL line of code, to develop an optimization study. I modeled the structure in APDL, processed and am deactivating (EKILL) and reactivating (EALEAVE), if necessary, the elements according to their deforming energy state. I store the results of strain energy values in an array at each step. I noticed a problem that worried me: the stored values of the deformation energies of the elements deactivated by ANSYS APDL (via EKILL), at one point in the interactive process, remain in the matrix, in the next step, when a new matrix is generated for store the deformation energies of the elements within a new processing configuration. I think these values should be zero for these elements. Could someone clarify me these results?
Hi,
Please check the explanation from ANSYS:
To achieve the "element death" effect, the ANSYS program does not actually remove "killed" elements. Instead, it deactivates them by multiplying their stiffness (or conductivity, or other analogous quantity) by a severe reduction factor [ESTIF]. This factor is set to 1.0E-6 by default, but can be given other values (see Section 6.2.2 for more information). Element loads associated with deactivated elements are zeroed out of the load vector, however, they still appear in element-load lists. Similarly, mass, damping, specific heat, and other such effects are set to zero for deactivated elements. The mass and energy of deactivated elements are not included in the summations over the model. An element's strain is also set to zero as soon as that element is killed.
http://mechanika2.fs.cvut.cz/old/pme/examples/ansys55/html/guide_55/g-adv/GADV6.htm
Hope this helps.
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