contact pressure
Altair EmployeeGood morning
I'm making a contact analysis. Can you explain me step by step how can I have the contact pressure output?
Thanks in advance for assistance.
Answers
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In Control Cards>>Global Output Request>>CONTF.
Contact output includes contact pressure and force. The contact forces can be output element by element or surface by surface.
<?xml version="1.0" encoding="UTF-8"?>
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Good morning
I did as you said.
<?xml version="1.0" encoding="UTF-8"?>
But the results do not appear the option contact pressure. Can you help me?
Thanks in advance for assistance.
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Can you share the model (.fem) file?
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Ciao Giorgio,
Grazie per la Risposta. Di Seguito si allega il Richiesto file.
Grazie in anticipo per la Tua Assistenza.
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Altair Forum User said:
Puoi condividere il modello (.fem) file?
can you help me?
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The CONTF entry is only applicable in nonlinear analysis subcases that are identified by the presence of an NLPARM subcase entry. NLPARM – Parameters for Nonlinear Static Analysis.You can create a load collector with NLPARM as card image.
Change the analysis type in load step to non linear quasi static and in NLPARM subcase recall the load collector created with NLAPRM card image.
Change these parameters in the input file and run the analysis.
<?xml version="1.0" encoding="UTF-8"?>
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Thank you very much George P Johnson,
I did as you said. In that unit of measure returns me the contact force?
Thanks in advance for assistance.
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Once CONTF card is activated with NLAPRM card recalled in load step , you will contact force as output in HyperView.
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Altair Forum User said:
Once CONTF card is activated with NLAPRM card recalled in load step , you will contact force as output in HyperView.
I understand, but my question is what is the unit of measurement of contact force? Because I need to have the contact pressure in MPa.
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The output unit will be based on your input unit.
The normal unit input what we follow is Tonnes, mm, sec. In this case, the output will be MPa.
Please find the attached image for unit consistency. <?xml version="1.0" encoding="UTF-8"?>
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Thank you so much for the assistance but the contact force is a force. I would like to know the contact pressure. Also I would like to know a method to determine the contact area.
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The elements attached to the contact surface can be found using Tool--> find--> find attached--> find--> save found.
Then these elements can be retrieved in Tool--> 'Masc cal' panel which gives the area of the attached elements which is equivalent to the area of the contact surface.0 -
Does this apply to solid elements?
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If you request 'contf' in opti format (besides h3d), there will be a text file output with these values of force and area for each contact group, solids or shell.
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Altair Forum User said:
If you request 'contf' in opti format (besides h3d), there will be a text file output with these values of force and area for each contact group, solids or shell.
Only for the new release right?
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/profile/92911-faroukm/?do=hovercard' data-mentionid='92911' href='<___base_url___>/profile/92911-faroukm/' rel=''>@FaroukM I don't remember the version. At least 2019.2 already had it.
There will be a .cntf file with force and area by contact surface, foreach load increment.
SUBCASE 1 1 LOAD: 0 Nonlinear Load Factor: 1.000000E+00 LABEL: Caso de Carga 1
CONTACT INTERFACE: TOTAL FORCE ACTING ON MASTER SURFACE (BASIC SYSTEM) AND TOTAL CONTACT AREA
CONTACT# FORCE-X FORCE-Y FORCE-Z MAGNITUDE AREA
1 8.2880E+01 4.1754E+01 -1.7168E+05 1.7168E+05 1.5395E+04CONTACT INTERFACE: TOTAL NORMAL AND TANGENTIAL FORCES ACTING ON MASTER SURFACE (BASIC SYSTEM)
CONTACT# NORMAL FORCE TANGENT FORCE
1 7.1198E+04 1.0048E+05
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Thanks mate
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