FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
(OP)
Hello Everyone,
Uniform wrapping pressure induced by one layer of wire rope wounding around the drum can be estimated as
P=F/Rm b
P is the line pull tension at each th layer
Rm is the radius of turns of wire rope on drum (PCD/2)
b is the wire rope diameter
This assumes uniform pressure estimated from the wrapped wire rope but in reality due to stiffness and friction the line pull tension will reduce in the following coils so it shall be some sort of pressure distribution formed. In addition, there are no proven formula (rather theoretical or using design factor) to calculate multi-layers of wire rope wrapping pressure.
I started modelling this in Ansys/ Abaqus. Does anyone knows or have experiences in this:
1) How do I model the wire ropes (I.E including solid elements of wire rope in 3D geometry)? In Ansys, what module I can use (ie static structural)?
2) What parameters do I need to model (I.E frictions between wire rope and between drum body and 1st layer of wire rope/ axial and tangential stiffness of wire rope)?
3) What contact interaction properties and modelling methods are available for this?)
Diagrams attached for reference. Thanks for your opinions and sharing.
Uniform wrapping pressure induced by one layer of wire rope wounding around the drum can be estimated as
P=F/Rm b
P is the line pull tension at each th layer
Rm is the radius of turns of wire rope on drum (PCD/2)
b is the wire rope diameter
This assumes uniform pressure estimated from the wrapped wire rope but in reality due to stiffness and friction the line pull tension will reduce in the following coils so it shall be some sort of pressure distribution formed. In addition, there are no proven formula (rather theoretical or using design factor) to calculate multi-layers of wire rope wrapping pressure.
I started modelling this in Ansys/ Abaqus. Does anyone knows or have experiences in this:
1) How do I model the wire ropes (I.E including solid elements of wire rope in 3D geometry)? In Ansys, what module I can use (ie static structural)?
2) What parameters do I need to model (I.E frictions between wire rope and between drum body and 1st layer of wire rope/ axial and tangential stiffness of wire rope)?
3) What contact interaction properties and modelling methods are available for this?)
Diagrams attached for reference. Thanks for your opinions and sharing.





RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
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RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
Yes, that is hoop stress induced by the wrapping pressure of the wire rope. It can only be assumed to be uniform pressure by theoretical calculation. However, in practice due to friction and wire rope stiffness the pressure will be less and less as the layer and coil numbers increase. So would like to perform FEA to determine this effect.
RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
What are you actually trying to establish with this model?
Cheers
Greg Locock
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RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
It's an interesting problem, but it is telling that there seem to be no other links via Google that touch on FEA and wire rope wrapped on drums.
There are a few listings that look like analysis of wire rope under plain tension.
RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
Have done the the hand calculations. Yes, you are right. It will assume a sheet of material under tension and lead to conservative results. In fact this will be very conservative if we now consider multi-layers piling up to 10 layers. There are no proven formula for calculation of hoop stress under multilayer wire rope. Some design codes propose using safety factor etc.
So, to better find out the hoop stress under 5 layers of wire rope wounding on a drum, FEA is probably the better method.
RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
Do you have any experiences in FEA of hoop stress of multi layer of wire rope?
RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
TTFN
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[IMG http://tinyurl.com/7ofakss]
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
I suggest you use the search function.
Cheers
Greg Locock
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RE: FEA- Determine wrapping pressure of multi-layers of wire rope on winch drum
I searched some discussion on this topic but can't see any conclusion on the effects of friction and wire rope stiffness. Do you have any references and links that has concluded some scientific formula or FEA to determine the wrapping pressure of multilayer wire rope on drum..
Yes you are right. once the wire rope coils increase longitudinally the stiffness will absorb the tension. and also once it piles up radially the friction and stiffness will further absorb the tension. So the wrapping pressure will be smaller when there are said 5 layers of wire rope fully coiled up along the drum.