hi,
i need to simulate a study where a steel rope to be wounded over a drum, with one end of the steel rope fixed in the drum by providing a slot, and the free end of the rope carring a load.
my main concern is to find the stress distribution over the drum, due to load in the rope.
awaiting for reply.
This thread may help. https://forum.solidworks.com/message/295478#295478
There is another one somewhere, I am just trying to find it.
hi Greg,
thanks for your reply, the thread which you have provided is meant for animation, where as i am loking for analysis not animation
Dan,
What is it you need help on? Have you been able to build a solid model of your rope and drum? When you say drum, do you mean a "real" drum with walls very thin compared to the diameter?
I'm not very familiar with SolidWorks Simulation but I suspect that you will have to analyze a solid rope. If it is a thin walled drum, then you will want to use shell elements, so you need a surface model of the drum. I'm not sure how well Simulation handles the friction contact that you need between the solid elements in the rope and the shell elements in the drum. You might be forced to use solid elements for both, which means you will need many more elements in the drum.
If you are really lucky Simulation could work with beam elements for the rope. That would require the least elements and solve much faster.
Jerry Steiger
hi Jerry
thanks for your reply, i can build solid model of cable and drum. where as iwant to apply the steel rope property to cabe.
so that if a load is applied at the free end of the cabe, it rolls tightly over the drum and crushes the drum.
as of now, if i apply load it acts as wounded solid over the drum it dosent behaves like a rope at all.
how to apply such property to the cable. so that the load applied at the free tip of the cabe is fullty distributed throughted the cable.
Hi Dan
The problem is that a steel (or any other) rope has different properties in different directions. It is very stiff in extension but not in bending. When it is curved over a drum, it will be stiff tangentially to the drum but not radially. I very much doubt that this can be simulated in SW, even in more specialized FEM products this would present a challenge. One possibility could be to represent the rope as an evenly distributed pressure on the drum, however this will not take friction in to account and will at best give you a rough estimate.
regards
Per Engberg
Hi Per
i do had the same doubt in me,
i initially tried with applying pressure on the drum and run the analysis,but i am not satisfied with the Results,
i was expecting some one who have faced simillar situation.
if they might tend to analysis similar problem.
that's why i posted this discussion.
will look further if any one could comeout with better sugession.
my main concern is,
when a load is applied on the cable, it should be distributed in the cable radialy with refrenec to drum.
Regards
Dan
What is the object of this anaysis? You could get a decent estimate of the pressure distribution along the cable length on the drum by running a contact analysis using about 3 wraps on the drum. After 3 wraps the tension load will have been largely taken out by friction. I really doubt the transverse cable properties will have a significant effect on the longitudinal distibution, though the bulk parameters would need to be about right. To make the thing solve easier, you could model it with a prismatic crossection since friction is independent of surface area (F=mu*N). If the transverse distribution is desired you would ony need to run a small section of cable to whatever level of detail is required over some small acr length of the drum. Intercable/stran contact while difficult is a long way from impossible. Likely beyond the contact formulation in SWX sim it could likely be done in MARC, ABAQUS or AMPS as far as codes I am familiar with - maybe ANSYS but this type of problem is not histroically their stong suit..
Hi Dan
The problem is that a steel (or any other) rope has different properties in different directions. It is very stiff in extension but not in bending. When it is curved over a drum, it will be stiff tangentially to the drum but not radially. I very much doubt that this can be simulated in SW, even in more specialized FEM products this would present a challenge. One possibility could be to represent the rope as an evenly distributed pressure on the drum, however this will not take friction in to account and will at best give you a rough estimate.
regards
Per Engberg