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Wood Screw Pull out in Plywood

Wood Screw Pull out in Plywood

Wood Screw Pull out in Plywood

(OP)
I am a mechanical engineer playing structural engineer these days.  I never really studied wood as an engineering material and am having a time trying to develop my methods for validating attachments into wood.  
I need to hang a sign using a threaded rod with a 3/8 wood screw thread lagged into a piece of 3/4" plywood.  The other side is a machine screw threaded into a piece of aluminum.  I'm kind of stuck on putting a number to the pull out allowable of the wood screw.   
Its an interior sign, no wind or water.  

Any thoughts on where to go?

RE: Wood Screw Pull out in Plywood

How much does the sign weigh??

RE: Wood Screw Pull out in Plywood

(OP)
About 100lb.  2 supports, pure tension.
I am not necessarily worried about failure, but rather that I have to show a number that exceeds a failure criterion.  Also, that I need to develop this skill for future analysis.

thanks for the response.   

RE: Wood Screw Pull out in Plywood

(OP)
Holy cow that was awesome.  What a great reference.  

Thanks guys.

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