FKM Modulus
FKM Modulus
(OP)
I'm looking for appropriate mechanical properties for fluorocarbon materials. I'm pretty certain Poison's ratio is very close to 0.5. I'm having a much harder time coming up with Young's Modulus.
The only values I've found are 6 MPa for a "typical" ~70 durometer material and 14 MPa for a "high modulus" material of unspecified durometer.
Any hard data would be appreciated.
The only values I've found are 6 MPa for a "typical" ~70 durometer material and 14 MPa for a "high modulus" material of unspecified durometer.
Any hard data would be appreciated.





RE: FKM Modulus
Hardness versus Modulus
There is a rough relationship between the Young's modulus of a material and its hardness,as measured by a Shore durometer. There are several Shore 'scales' for hardness. The one normally used for measuring the hardness of soft materials like rubber is the Shore A scale. The relationship between Shore A hardness and the Young's modulus is listed in
Table 1.
Shore A Modulus(MPA)
10 0.27
20 0.61
30 0.97
40 1.54
50 2.45
60 3.45
70 5.47
80 8.68
Table 1. Relationship between Young's modulus and the Shore A hardness scale.
From http://www.pspglobal.com/properties-hardness.html
RE: FKM Modulus
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RE: FKM Modulus
RE: FKM Modulus
Incompressibility
A material is incompressible if it exhibits zero volumetric change (isochoric) under hydrostatic pressure. Theoretically, Poisson's ratio is exactly one-half (0.5) and the bulk modulus is infinite (and det f = 1).
Near incompressibility means that Poisson's ratio is slightly less than 0.5.