

June 27, 2020 at 3:33 ammasud407Subscriber
How can I apply compressive load in the form of microstrain (for example 3000 μ epsilon) in ANSYS workbench?
epsilon means strain here.

June 29, 2020 at 6:59 pmSaiDAnsys Employee
Hi,
In Workbench, go to the top tab > Units > Unit Systems. The Unit system number 9 has length in micrometers. So activate it under columns B and C and hit Close. If you check Units again, this unit system should be selected and you can apply Displacement boundary conditions in micrometers.
Hope this helps,
Sai

July 1, 2020 at 10:40 ammasud407Subscriber
Hello Sai,
Thanks for your reply. I understand the point regarding unit systems. However, is the application of displacement as the boundary condition similar as the application of strain?

July 1, 2020 at 1:40 pmSaiDAnsys Employee
Hi,
You cannot apply Strain as a boundary condition. What you would do is convert that strain to displacement (based on the geometry dimensions) and apply the Displacement boundary conditions. E.g. if you have a cylindrical bar of length 10 m and you want to apply a strain of 10%, you would apply a displacement boundary condition of 0.1*10= 1m. But this analytical conversion of strain to displacement assumes that strain is uniform everywhere which might be a valid assumption if you have a simple geometry, but may not hold if the geometry is complicated.
Hope this helps,
Sai

July 1, 2020 at 6:04 pmmasud407Subscriber
Hello Sai,
My geometry is a kind of elliptical shape. The paper that I am following mentioned that they applied 3000 μ epsilon (Where epsilon is strain). You gave an example of a 10% strain, but how should I consider for 3000 μ epsilon case?

July 2, 2020 at 1:16 pmSaiDAnsys Employee
Hi,
Strain and stress are outputs in any finite element analysis. If it's a Static Structural system, the solver solves the equation [K]{u}={F}. So on the boundary you can either define u i.e. displacements or F i.e. force (which can be derived from force or pressure boundary conditions). So I am not sure how they applied a strain boundary condition without converting the strain to an equivalent displacement on the boundary. The only way I can think of is applying a displacement, checking the output strains and increasing or decreasing the displacement applied till the desirable strain output is achieved.
You mentioned "applied 3000 μ epsilon". What does the "μ" stand for? May be that could be a clue?

July 3, 2020 at 5:20 pmmasud407Subscriber
Hello Sai,
The point that you mentioned in the first paragraph is totally understandable. It was mentioned that a compressive
uniaxial load of 3,000microstrain was applied. The term 3000 microstrains confused me and I don't know how to apply it in ANSYS workbench
Here, 3000 μ epsilon means 3000microstrains.

July 7, 2020 at 1:48 pmSaiDAnsys Employee
Hi,
Looks like microstrain just means 1*10^6 strain. So the paper applies a strain of 3000*10^6 i.e. strain = 0.003. My guess is they calculated the approximate displacement of the top surface based on the geometry and linear assumption (strain=(LL0)/L0) and applied the displacement boundary condition.

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