Deflection of FR-4 disc material

Deflection of FR-4 disc material
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Posted by: kuzieman77 ^®

06/27/2009, 18:50:41

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I have an FR-4 material round disc, .063 inches thick that is supported all around the circumference, .06 inches in from the outside circumference. The disc is just resting on a circular ledge. It is not attached to the ledge. The disk is 1.12 inches in diameter. The disc has a screw in the center of it that will be causing an axial deflection at the center of the disc of .010 inches. I need to determine if the FR-4 material will be able to withstand that deflection, or if it will fail. If it will fail, what is the maximum deflection it can withstand without failing? I don't have time to purchase a text book, so if anyone has an equation that will work I would appreciate it greatly. Or perhaps there is a web site that could do this for free.

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