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I'm looking for plastics that are exremely wear and abrasion resistant at 220 F. They need to processed into tube sections that are 12 inches long, with 7.75 inch OD, .325 inch wall. Continuous sections can be cut into shorter lengths. Thanks.

Thanks for the info. The pulley also has a high rpm, but the stresses induced on the pulley are small.

Actually, I wanted to make sure I applied the loads correctly. It is for a belt driven pulley, so I think the load which induces the torque is probably applied over some arc length. The belt tension also creates a total load that is reacted through the hub. I was wondering if others have modeled...

What loads are needed, how should they be applied, and what is the proper approach to use to analyze a pulley? I have a solid model of the pulley and I'm trying to determine if plastic would be appropriate. I've been given the applied torque, hub load, and rpm. I also have the operating...

You can go to matweb.com and compare the tensile and flexural moduli for several materials. A quick look appeared to show most within 10%. If I have a purely bending application, I'll use flexural properties, including flexural strain.

If you are only going to analyze a couple of parts, it would be less expensive to hire someone on the outside. If you are planning to conduct more analyses in the future, it would be worth purchasing or leasing a package. It is a good skill to have also.

Try: Glenn Beall Plastics Ltd., 32981 N. River Road Libertysville, II. 60048 USA. Tel: 001 847 549 9970 Fax: 001 847 549 9935 e-mail: glennbeallplas@msn.com

I think you should be able to find a laminated plate program that will generate those values for you. I would search on the internet and see what comes up.

I heard the argument again that "All voids in injection molded parts are due to trapped air or gas, and not due to shrinkage. Shrinkage causes internal cracks, but not voids". For this discussion, voids are defects that are roughly spherical. Any comments?

I think the fact that the center of the disk is not fixed uniformly may be part of the problem. This leads to a nonuniform stiffness, thus nonuniform deflection and force distribution around the circumference, which could cause uneven wear. The part is gated on the side, which results in...

The surface distortion is more like a sine wave. I learned that the part was molded cold, which for this semi-crystalline material would result in less crystallinity and lower wear resistance. I think this will be retested after being molded in a hot mold. There is another similar application...

The differential surface speed is an interesting idea, although the wear looks like a sine wave from inside to outside. I learned that the part was molded cold, which for this semi-crystaline material would result in less crystallinity and lower wear resistance. I think this will be retested...

I have two plastic round plates (disks)in contact. One is rotating against the other one. (A type of brake application). The wear of the thickness of the plates is uneven. A cross section would show a wavy pattern from the inside radius to the outside radius. Any idea what could cause this? thanks.

I have two plastic round plates (disks)in contact. One is rotating against the other one. (A type of brake application). The wear of the thickness of the plates is uneven. A cross section would show a wavy pattern from the inside radius to the outside radius. Any idea what could cause this? thanks.