Linear static analysis
Altair EmployeeI have a part like following the back plate is constrained and pressure is applied to a round surface on top. I have done linear static analysis. and found the deflection, as follow
mac displacement= 2.7 mm
I have doubled the thickness pressure and constraints are the same as previous one
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bu the maximum deflection has increased while I expected to have decrease in maximum deflection since I have doubled the thickness and I have more stiffness
Max displacement = 3.2 mm
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I was wondering what can be the reason ? What should be the trend of maximum displacement?? by increasing the thickness should I expect increase in maximum deflection or decrease??
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Altair EmployeeThe elements are 3D, second order tet. Parts are connected with freeze contact. The added thickness is in opposit z direction as shown in follwing pic
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and constraints are created on back plate for both model
Do I have to expect decrease in displacement in z direction while I add thickness in z direction?
Since my results does not show this trend ( I have increase in maximum displacement while I have added thickness) what could be the reason of this error??
I really appreciate your help
Hi,
To me it looks like a intended behaviour. Basically you are increasing height which which let central location to deform more.
I gave a test run on simplified model to understand & end up getting same behaviour in that model.See attached screenshot.
If objective is to reduce displacement then its good to add ribs which increase stiffness.Adding thickness would be a last option that too depending on the shape of geometry.
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
Altair EmployeeHi Rahul
Thank you so much for your help
Altair EmployeeWould you please explain more about adding ribs. My model is solid it is not hollow from inside like yours. Where can I add ribs?
Would you please advise me regarding the ways I can decrease the maximum displacement with current material
There are many ways to add ribs in solid & shell meshed component.HM Hypermorph or simlab would be best suitable for adding ribs.Let me check some sharable file.
Meanwhile i request you to perform modal analysis to get modal behaviour.(Mode shape & Freq)
What type of element you have created 2d or 3d?In which region you have increased thickness.How parts are connected?
Yes its true that by increasing thickness one can expect decrease in displacement but one needs to understand geometry as well.
Regards
Rahul R