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Ganesh Munge

element deformation contour plot visulazation

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Dear All,

 

Please revert on following queries

I'm pressing circular ring into hub by using rigid plate.

1. Is the element deformation shows right color pattern?

2. Should i need to go for higher order element?

3. Should i need to fine the mesh?

 

image.png.b813204b9092bd1f28508f0e7a47bab5.pngimage.png.54a90112d7272204a15d9edfe85e4ac8.png

 

 

 

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Dear Prakash, this is the previous analysis results of same type of analysis.

 

here, I havent used R body element for pressing plate.

 

but in above case, i used. all other things are same.

 

 

image.png.2fab1a0903238d69d591ed71a471cb09.png

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@Ganesh Munge

 

I think having a rigid will change the stiffness on contact and this is what makes the difference. 

 

What is the Istiff on contact card with and without Rigid?

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2 minutes ago, Ganesh Munge said:

ring and housing are elastic

type 24

p14_solid

 

but time step is different

0.1 sec= 20mm disp

image.png.2fab1a0903238d69d591ed71a471cb09.png

 

0.01sec= 10mm

Didnt get it? Time step?? or the end time you want to say??

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3 minutes ago, Ganesh Munge said:

ring and housing are elastic

type 24

p14_solid

 

but time step is different

0.1 sec= 20mm disp

image.png.2fab1a0903238d69d591ed71a471cb09.png

 

0.01sec= 10mm

Clearly you are loading with rapid velocity in second case, In second case you are getting this element distortion?

Ganesh Munge likes this

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@Prakash Pagadala

 

sure i'll try it out.

 

@Nachiket Kadu

 

there are two cases

1. with rigid

2. with out rigid.

geometry is different in both cases but phenomenon is same.

for first case 

disp curve is 

X                  Y

0sec           0mm

0.1 sec       20 mm

 

for second case

X                  Y

0sec           0mm

0.01 sec       10 mm

 

my question is will time step result into such elemental behaviour?

 

 

 

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Just now, Ganesh Munge said:

@Prakash Pagadala

 

sure i'll try it out.

 

@Nachiket Kadu

 

there are two cases

1. with rigid

2. with out rigid.

geometry is different in both cases but phenomenon is same.

for first case 

disp curve is 

X                  Y

0sec           0mm

0.1 sec       20 mm

 

for second case

X                  Y

0sec           0mm

0.01 sec       10 mm

 

my question is will time step result into such elemental behaviour?

 

 

 

are you doing an impact analysis or an quasi-static analysis? I think it sholud be a case of quasi static analysis. Surely what you are giving as loading time is too rapid. I suggest you take default value of 0.3 for your loading and check the results.

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Just now, Nachiket Kadu said:

are you doing an impact analysis or an quasi-static analysis? I think it sholud be a case of quasi static analysis. Surely what you are giving as loading time is too rapid. I suggest you take default value of 0.3 for your loading and check the results.

what is the energy error you are getting for the simulation? 

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3 minutes ago, Ganesh Munge said:

Dear @Nachiket Kadu

 

Please have a look on energy plot

 

image.thumb.png.62ff64e81668a4102d0f6b7fc7d42a67.png

1.Make changes in property and try using QEPH formulation to aviod hourglass energy.

2. Give your loading gradual to avoid sudden impacts you may consider to give the end time as 0.3.

Apply these changes and check the results. You please go through the previous content for Radioss regarding energy error and troubleshooting techniques.

 

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35 minutes ago, Ganesh Munge said:

@Nachiket Kadu @Prakash Pagadala @George P Johnson

 

I want to check pressing force required to insert ring into hub, 

I have simulated 1/4th geometry.

and got x N of force.

 

and suppose, i have full geometry, what will be the pressing force?

will it be 4 times of first case or same?

Yes, we can sat that reaction forces are proportional to size of the component.

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Hi, 

Try these workarounds:

Hourglass seems to very high in the model.

For solid elements use Isolid-24 and if any shell elements are there use ishell-24 and N-5. 

For the contact keep Istf to 4, so that minimum of master and slave will be calculated. Also give a minimum stiffness (Stmin-1000N/m). Plot the global contact energy also.

Ramp the load in 300 milliseconds so that the solution will be stable.

Once these changes are done, run the simulation and plot the hourglass energy for each part so that we can see which part is contributing more.

And finally make sure correct material type and parameters are used. 

Which material is used for this?.

 

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