Andrew,The entire point of a Belleville washer is that you should. They are conical spring elements and should really be treated as springs rather than as washers. If you go to Lee Springs ( http://www.leespring.com/int_learn_belleville_wash.asp ) you can get some information on them (more is in their printed catalog) that will help you design with them.The problem in simply characterizing their deflection is that they deform about a dynamicas a complex tapered beam in bending where Poisson's ratio assumes a much larger and non-linear role in the mechanics of deflection. Roarke'sor Blaine'scan provide detailed specifics on such analysis. Back when the Belleville Company held exclusive right to the manufacture & distribution of such things their catalog contained an amazing amount of information on the subject -- but my copy is hiding from me right now...
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Belleville disc springs help preserve bolt integrity, particularly in areas that must bear a heavy load. In some instances, the addition of a flat washer increases the effectiveness of a Belleville disc spring by helping to spread the load.
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In other applications, a flat washer can prevent a Belleville disc spring from biting into softer metals. This is particularly important in preserving the integrity of bus bars, which are typically made from aluminum to withstand conditions of high current loading.
BelleFlex® engineers can provide assistance in determining whether flat washers are needed for your specific application.
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