I don't believe that there is a direct conversion. I am pretty sure that the modulus of elasticity is effected by the types and percentages of fillers as well.
I've worked with mechanical testing of polymers for years and I've never heard of any conversion either. Modulus of elasticity is the stress at a given elongation. Hardness is a measure of the resistance to compression. Normally modulus will increase with hardness.
Not only will fillers affect modulus, the base polymer will change modulus. A Shore A 65 nitrile won't have the same modulus as a Shore A 65 fluorosilicone. The best way to find the neoprene modulus is to tensile test it.
To find a correlation between Shore hardn. and the Modulus one would have to know the coross-sectional area of the mark under the load (during test) and the area after removing the load of Shore tester. If those areas were the same then the Modulus would be very low (sample compliant). If the difference is zero then the Modulus is extremely high (sample acts as a spring). The Shore measurement itself will NOT give you any idea of the Modulus.
I work for Raufoss Composites in Norway, and I would to ask whether it is possible or not to receive any technical information about:
Elastomers in dynamic applications
Effect of frequency, strain and temperature
The reason why i ask this question is that we are working on a special case, where a 2 gram
piece of detonation unit in a missile needs a damping element of rubber in front and at the rear during the phase when the missile hits its target. The system is exposed to a g-force of 90.000 g during a very short time of 0,03 ms (about 33.000 Hz).
Do yua have any data describing how the e-module is affected by the frequence? We consider natural rubber, neoprene, butyl and silicone. The actual temperature is -35 degr c to +60 degr C.
Thank you in advance
You should contact RAPRA in the UK. They publish a book 'Dynamic Mechanical Analysis for Plastics Engineering' which covers DMA data (storage and loss modulus) on temperature sweeps and frequency.
Is there a method to convert from a given Shore A Hardness for neoprene sheet of a specified thickness (say 60A, 1/2" thick), to the amount of compression (percentage or absolute linear measure) for a given load (in PSI's)? [I am obviously out of my area of expertise, and hope this is a meaningful question.]
If it helps, I am assuming that I will be nowhere near the maximum loading for the material. THANKS.
