Maximum Load on a Plastic Sheet

AI Thread Summary
Using HDPE as a bearing between a concrete footing and a column raises concerns about its ability to withstand a pressure of approximately 140 psi, given its tensile strength of 4,000 psi. The discussion highlights the need to assess whether the HDPE will be crushed under the column's weight, potentially compromising its function. An alternative material considered is UHMW Polyethylene, which has a compressive strength of 3,000 psi and is expected to handle the 150 psi load effectively, though there is uncertainty about comparing pressure from a load to compressive stress. The use of Teflon or UHMW is suggested for their lower coefficients of friction if the slide bearing concept is pursued. Ultimately, careful evaluation of material properties is crucial for ensuring structural integrity.
jamesm
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I am going to attempt to use a sheet of HDPE betwen a concrete footing and the base of a column to allow the column to move with thermal expansion in the structure it is supporting. My question is how can I determine if the HDPE will be crushed by the weight of the column and no longer act as a "bearing". The pressure from the column will be ~140 psi, and the tensile strength of HDPE is 4,000 psi with a Rockwell hardness of [Shore D60-68]. If this material is not strong enough what would be a suitable alternative?
 
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I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?
 
If I decide to stick with the slide bearing idea I will probably use Teflon or UHMW Polyethylene since it has a lower coefficient of friction. I did find that the UHMW has a compressive strength of 3000 psi. The pressure that the column exerts on the UHMW will be ~150 psi so I'm thinking it will be fine, but I'm not 100% sure if pressure from a load is comparable to comp stress.

Thanks for following up.
 

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