Is there formula to calculate the compressive force required to achieve x% of squeeze in an O-ring? I have referred the Parker O-ring and Apple Rubber Handbooks, but they provide just approximations. I am trying to calculate the linear force per length for a 4 mm o-ring and I want to achieve 25% squeeze.
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$\begingroup$ Temperature may also be a factor that you should consider. $\endgroup$– Solar MikeAug 8, 2017 at 18:37
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To be honest, if you need more precision than what the handbooks tell you, your best bet is to buy some o-rings and test them under the range of conditions under which you expect them to function.
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$\begingroup$ I am okay with the approximations but my trouble is that these handbooks do not have data for o-ring size close to 4 mm cross section. Nearest one is 0.139 inches, which is half a millimeter smaller than 4 mm. I don't know how or whether to approximate that. That's why I am looking for a formula. $\endgroup$ Aug 10, 2017 at 18:02
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$\begingroup$ Call the vendor supplying the 4mm o-rings and ask them for the data. $\endgroup$– DLS3141Aug 10, 2017 at 18:04