Three pieces of plywood are held together by a couple of washers (one on each si

Question

Three pieces of plywood are held together by a couple of washers (one on each side of the plywood pieces) and a steel bolt 16 mm in diameter. The washers have an inner diameter of 20 mm and an outer diameter of 40 mm. If the stress between the washers and the plywood cannot exceed 7 MPa determine the maximum allowable axial stress on the bolt. (this looks like the picture, with 0 being the washers and - being the screw.)

0|_|_|_|0-

I'm having trouble with this problem. I also don't know if the 7 mpa would be divided in two for each of the washers, or if where the area of the washers would even come to play. Clear answers are encouraged. Thank you.

Explanation / Answer

David K. Adams, S.E.,

is a registered civil and structural engineer in Californiawho graduated from the University of California at San Diego with a degree inStructural Engineering and has practiced with Lane Engineers, Inc. since 1990.A typical workday for Mr. Adams includes completion of structural calculations,drawings, and reports on buildings and other structures for commercial, residen-tial, educational, institutional, and industrial uses. In addition to providing plan-checking services for local municipalities to determine building compliance withlife safety, accessibility, and structural requirements of current codes, the authoralso provides expert review services for California

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