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moecklmore

Friction Heat

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Hello there,

basically I am doing an analysis of our brake disc for formula student in radioss. So far the structual part works and the energies look fine.

The next step is to get the thermals in there.

In the documentation for the type7 interface there exist an Fheat. But I can't find it in Hypermesh.

So my Question is whether the enegry transformation into heat is working or not if only I_the is activated.

Another strange problem I am facing at the moment is that if i define a starting temperature in Ti and T0 (~300 K) the results still show me 0 K.

 

By the way I am using Block 120 because on the cluster only 120 is installed.

 

 

Looking forward for some help.

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Hi,

The heat transfer or heat friction  is activated only once the user keep Ithe=1. As the Ithe is kept 1 we can see that the frictional heating factor, Fheat, is active in the card.

I recommend you to go through Example 53 - Thermal Analysis in the Help Menu. The example file and model files are attached for your reference.

Example 53.pdf

moving_source_0001.rad

moving_source_0000.rad

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Well as I said in Block 120 there is no Option for Fheat when Ithe is enabled.

In Block 140 there is the Fheat Option displayed when Ithe=1 but not in Block 120. Therefore the question whether Fheat is enabled by default or simply not available in Block 120. So no frictional Heat would be possible in Block 120, right?

 

 

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Hi,

I think this option is not supported in HyperMesh 13. Can you check the same in HyperCrash?.For HyperCrash 13, we have these options available.

By the way, please upgrade to the latest, that is HyperWorks 2017 and try the same. 

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Okay so in Hypercrash it is available. But I still have another Problem I don't understand.

If I define a starting temperature in the material (300 K) and look at the results it says 0 K even when the contactsurfaces are in contact and should therefore produce heat.

I have also tried to apply a load (initial Temperature) but the results show still 0 K.

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Hi,

Please go through the below details on Type 7 interface.

  1. If Ithe_form=0, Tint indicates the constant interface temperature. If you want to impose the heat flux in the model/structure, you can define constant temp for interface (say, Ti) and To as initial temp of the structure. Heat induced in the model through interface = RTHE * (Ti – To) * Area of contact s/c.
  2.  If Ithe_form=1, heat transfer between the master and slave will occur at the rate defined in Rthe

Hope this helps.

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