How to design polymer?
How to design polymer?
(OP)
Hello, I was assigned to help design a small plastic structure. My background is more in concrete. I modeled the structure using FEA. The structure will be buried and loaded with soil cover and vehicle load. My questions are the following:
1. What shall I use as my limiting factor? Shall I use the yield strength of the material? Do I add some kind of reduction factor to account for creep? Is there a design book I can follow?
2. When I design concrete we typically factor the load instead of Factor of Safety. The load factors are determined by AASHTO. From what I see so far, most people use unfactored load and use factor of safety to design plastic. How do you determine the Factor of Safety?
Thank you!
1. What shall I use as my limiting factor? Shall I use the yield strength of the material? Do I add some kind of reduction factor to account for creep? Is there a design book I can follow?
2. When I design concrete we typically factor the load instead of Factor of Safety. The load factors are determined by AASHTO. From what I see so far, most people use unfactored load and use factor of safety to design plastic. How do you determine the Factor of Safety?
Thank you!
Talk To Other Members
RE: How to design polymer?
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: How to design polymer?
RE: How to design polymer?
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: How to design polymer?
RE: How to design polymer?
RE: How to design polymer?
Amorphous polymers creep less than semi-crystalline ones in general. You want the thermoplastics to have a Tg above the highest use temperature as well. Then load it up with glass fiber or even better, carbon fiber (way more expensive).