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Modal Analysis

Submitted by abeed on
eigen values

I have a model (ball) and would like to get the its eigen frequencies and eigen vectors (modal analysis), in fact i should not need to apply loads, it is just solution to K-w^2 M = 0, how can it be done

Influence of Penalty stiffness factor on simulation results

Submitted by abeed on
software
explicit dynamics
Penalty stiffness scaling factor
ANSYS- LSDYNA

The default value of penalty stiffness scale factor in Ansys-Lsdyna  is 0.1, when one varies this value, he/she obtains different results, the question, how can one  know the right value of penalty stiffness scale factor?

 

I am simulating the impact of a 6mm - diameter steel solid ball with a rigid falt surface using Ansys-Lsdyna. the speed of the ball at the impact moment  is low (from 1 to 10 m/s). specificly, i am intersted in the period between  just touching and  just leaving the ground for the first impact.

mesh refinement in ansys

Submitted by abeed on

 

how to refine those hot spots (heigh stress zones) in a meshed
structure using ansys. in fact i have a large body. most of body
subject to very low (negligible or zeor stresses) except few zones with
very much high stress. first i meshed my body with coarse mesh and i
noticed those area which i expect them from experimental results now
how can i refine meshes on basis of von mises stress range.

 

can one do it with 'select entities'and how?

 

refine heigh stree zones

Submitted by abeed on
refine by results

how to refine those hot spots (heigh stress zones) in a meshed structure using ansys. in fact i have a large body. most of body subject to very low (negligible or zeor stresses) except few zones with very much high stress. first i meshed my body with coarse mesh and i noticed those area which i expect them from experimental results now how can i refine meshes on basis of von mises stress range.

 

can one do it with 'select entities'and how?

 

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