Contact analysis
Altair Employee
Answers
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Is your problem a case of large deformation? What is the contact interface you defined? And at what load step your solution is being non-covergent? And which error value is resulting in non covergence?
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Dear Nachiket,
Thanks for support,
Issue was of equivalence. I forgot to do the same. Now it is sorted out.
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Dear @Prakash Pagadala, @Nachiket Kadu
Suppose
case 1:
I have an interference of 80 microns in shaft and housing and
case 2:
if i have gap of 80 micron bet same.
how can i define frictional contact contact between above cases.
can you revert with when to define search distance and when to define clearance. also, how to choose track
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Search distance is used define contact condition between slave and master, as in only those nodes will be in contact which satisfy the search distance criteria. Clearance defines the the distance the master and slave need to move so as to be in contact.
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If I have interference, What should i use clearance or search distance?
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I am not sure about previous version but negative clearance in 2017.3 is defines inititial penetration. @Prakash Pagadala correct me if i am wrong!!
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Altair Forum User said:
If I have interference, What should i use clearance or search distance?
Is your geometry in base size or tolerances are already included?
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refer this
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geometry is with tolerances,
these parts are in interference fit (image1) of 80 microns, I used clearence of -0.090. but after completion of simulation it is showing gap like in image 2
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Altair Forum User said:
geometry is with tolerances,
these parts are in interference fit (image1) of 80 microns, I used clearence of -0.090. but after completion of simulation it is showing gap like in image 2
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?> As in no contact u mean to say?
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Altair Forum User said:
As in no contact u mean to say?
These are in contact,
Outer ring of bearing is press fitted into the housing with the above mentioned interference value.
as per physics, housing should expand and outer ring should contact.
here outer ring is getting contracted and creating gap between housing and outer ring as i showed above in Image 2.
my question is why it is showing gap?, outer ring should touch housing inner surface.
<?xml version="1.0" encoding="UTF-8"?>
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Altair Forum User said:
These are in contact,
Outer ring of bearing is press fitted into the housing with the above mentioned interference value.
as per physics, housing should expand and outer ring should contact.
here outer ring is getting contracted and creating gap between housing and outer ring as i showed above in Image 2.
my question is why it is showing gap?, outer ring should touch housing inner surface.
<?xml version="1.0" encoding="UTF-8"?>
That gap which you are mentioning you checked distance between those node?
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HI,
Positive CLEARANCE is equal to the distance that slave and master surfaces have to move towards each other in order to close the contact,
Negative CLEARANCE indicates contacting bodies have initial penetrations and is equal to resolving interference-fit / press-fit problems
SRCHDIS is important in both cases.
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