Tension only element
Altair EmployeeDear support,
I would like to know how can I create a 1D element that resists to only tension (compression stiffness will be 0 , similarly to Link10 used in Ansys).
Thank you in advance.
Best regards
Vitor
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Dear Rahul,
is it possible to create a tension only spring element for a linear static analysis?
Thank you very much for your help.
Kind regards
Jo
One common application of LINK10 is to simulate a slack cable (with the tension-only option, the stiffness is removed if the element is under compression). you can use cgap element with FLIP option for it.
Set the 9th field of the CGAP element to 'FLIP' and then defining a tensile load in the field 'F0'of PGAP card
With these settings if you are able to get the positive gap force (ELFORCE) reported in the results then it corresponds to the cable/rope being in tension.
Please see the following comments in CGAP document. - Altair OptiStruct > Reference Guide > Input Data > Bulk Data Section:
CGAP
Alternatively, FLIP can be used to define a simple cable element. If such an arrangement is used, then it should be noted that:
a)
F0 corresponds to a pair of forces acting on the ends of the cable (pointing inwards), while U0 corresponds to pre-existing “slack” or extra length in the cable.
Gap “open” status corresponds to the cable being “shortened,” while “closed” gap status corresponds to the cable being “elongated.”
c)
Positive gap force reported in the results corresponds to the cable being in tension (note that the force also includes the effect of F0).