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# How do I model aircraft cable in RISA 3D?

## How do I model aircraft cable in RISA 3D?

(OP)
Has anybody modeled aircraft cable in RISA 3D?  What should I use for Allowable Yield Stress, Fy?  Would it be the breaking strength divided by the area?  Seems that would be the Fu tensile stress.

### RE: How do I model aircraft cable in RISA 3D?

I think that more than a RISA question it is a "technical" question. So the cable will have some intent and more or less defined setup, and a someway defined envelope of loading hypotheses. So how you model such something will depend upon all these things. In some cases the design of cable structures involves iterative steps; this also can be used within RISA even for large deformations (geometrical nonlinearities) that of course are not the intent of a program like RISA, but you can approach it by such iterative procedures. Respect a single straight cable you have a tension-only element in RISA-3D; this will help you to not get some problems in analysis when using cables and a number of hypothesis. Yet for a special hypothesis that ensures tension you can model the cable, use P-Delta and have a nice approximation (for problems that not require the iterative process referred above) of the standing stress for the hypothesis. That you may want to compare it to a fraction of Fu or to Fy or whatever will depend of your technical intent. If you throw your cable-like element to RISA under a code, RISA will try to check it as per the code.

(OP)
Thanks ishvaaaq.

### RE: How do I model aircraft cable in RISA 3D?

The USS Steel Wire Rope publication provides some values for cables.  They provide breaking strength and the E for structural steel.   There are also a number of design recommendations.

### RE: How do I model aircraft cable in RISA 3D?

Correction:

The USS Steel Wire Rope publication provides some values for cables.  They provide breaking strength and the E for the cable.  Typically the E for cable is less than that of structural steel.   There are also a number of design recommendations.

### RE: How do I model aircraft cable in RISA 3D?

(OP)
Thanks Oldrunner.  This lead me to a similar post with the attached manual I believe you are speaking of.  Here's the thread to find the attachment.

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