How do I know the validation of the structural analysis results?

Kesit Bayu

hello, my name is kesit bayu

I analyzed the structural of a component, from hyperworks I input a meshing of 0.03 with E (modulus of elasticity) of 210000 and NU of 0.3 with loads of 400 upward and 140 sideways

i am using optistruct to run analysis From the results of the analysis,

the largest deformation has a figure of 0.388

How do I know the amount of deformation, whether using meters or centimeters?

but when i see the deformation result of the component does not make sense

Thomas Quenaon_21507

Hi Kesit Bayu,

You are reviewing displacement here. OptiStruct/HyperMesh have no Unit System, you have to be consistant with your inputs.

For instance, if your model is defined in mm, Young Modulus is in MPa and Forces in Newton, the displacement will be in mm.

BR-

Thomas

QuyNguyenDai

Here're some example of Unit Consistency

Kesit Bayu

Thomas Quenaon_21507 said:

Hi Kesit Bayu,

You are reviewing displacement here. OptiStruct/HyperMesh have no Unit System, you have to be consistant with your inputs.

For instance, if your model is defined in mm, Young Modulus is in MPa and Forces in Newton, the displacement will be in mm.

BR-

Thomas

thanks for your answer sir, it is very helpfull

but, how do i differentiate that model definition is mm or other?, all i do is import from solidworks 

what about the deformation in the image? does it just show the direction and change of the component?

thanks

Kesit Bayu

thanks for your table, it will be very helpfull

Thomas Quenaon_21507

Kesit Bayu said:

thanks for your answer sir, it is very helpfull

but, how do i differentiate that model definition is mm or other?, all i do is import from solidworks 

what about the deformation in the image? does it just show the direction and change of the component?

thanks

Hi Kesit Bayu,

Regarding the length/size of your model, you have some tolls in HyperMesh to mesure your part:

This is useful when you don't know the units of the CAD you imported (this is still without unit but if it's 100 you should know if it's 100mm or 100m).

In general, HyperMesh is importing your CAD as is, wich means it should be the same units that you use in your CAD system (SolidWorks in your case).

 

Regarding the displacement, I suggest to look at the units of your model, it could be related to inconsistant units sytem.

BR-

Thomas

Kesit Bayu

Thomas Quenaon_21507 said:

Hi Kesit Bayu,

Regarding the length/size of your model, you have some tolls in HyperMesh to mesure your part:

This is useful when you don't know the units of the CAD you imported (this is still without unit but if it's 100 you should know if it's 100mm or 100m).

In general, HyperMesh is importing your CAD as is, wich means it should be the same units that you use in your CAD system (SolidWorks in your case).

 

Regarding the displacement, I suggest to look at the units of your model, it could be related to inconsistant units sytem.

BR-

Thomas

thanks sir, it is very helpfull

I have checked my model, the unit is meters. can I change the unit? or I have to adjust the meter unit to another input?

Thomas Quenaon_21507

Kesit Bayu said:

thanks sir, it is very helpfull

I have checked my model, the unit is meters. can I change the unit? or I have to adjust the meter unit to another input?

Sure you can scale your model if you want to be consistant with the other units. For that you can use the transformation tool:

BR-

Thomas

QuyNguyenDai

Kesit Bayu said:

thanks sir, it is very helpfull

I have checked my model, the unit is meters. can I change the unit? or I have to adjust the meter unit to another input?

If the length unit is M, you check your input to be consistent (see the table in my post). For example: Force = Newton; Pressure= N/m^2=Pa,...

Kesit Bayu

Thomas Quenaon_21507 said:

Sure you can scale your model if you want to be consistant with the other units. For that you can use the transformation tool:

BR-

Thomas

thanks sir, but what I'm doing now is changing the other parameters according to the meter units what I change is the modulus of elasticity to be the unit Pa

how about it?

Kesit Bayu

Q.Nguyen-Dai said:

If the length unit is M, you check your input to be consistent (see the table in my post). For example: Force = Newton; Pressure= N/m^2=Pa,...

ok sir i have tried it, I changed the material properties with the unit according to the meter unit,

I entered the modulus of elasticity with Pa units and Force with Newton unit

how about it sir?

thank you for all the advice given,

 

Thomas Quenaon_21507

Kesit Bayu said:

ok sir i have tried it, I changed the material properties with the unit according to the meter unit,

I entered the modulus of elasticity with Pa units and Force with Newton unit

how about it sir?

thank you for all the advice given,

 

Then stress result will be in Pa and Displacement in m.

BR-

Thomas

Kesit Bayu

Thomas Quenaon_21507 said:

Then stress result will be in Pa and Displacement in m.

BR-

Thomas

yes sir, thaks for all advice given, this is really helped me to finish this analysis, the next step I want to do is optimization

Thomas Quenaon_21507

Kesit Bayu said:

yes sir, thaks for all advice given, this is really helped me to finish this analysis, the next step I want to do is optimization

If it's ok for you, you can validate the helful answer to finish. Feel free to open another topic for Optimization.

BR-

Thomas

Kesit Bayu

Thomas Quenaon_21507 said:

If it's ok for you, you can validate the helful answer to finish. Feel free to open another topic for Optimization.

BR-

Thomas

yes sir, if there is an error during optimization I will ask this forum, this forum is very helpful in my learning stage