- 1). Use the ruler or digital calipers to measure the thickness of each part of the bolted assembly. Label each thickness t1, t2, t3, and so on.
- 2). Calculate the shear stress using the formula τ = F/(d*(t1+t2)) if the bolt connects two plates where each plate is subjected to a force (F) in opposite directions. This load case is called single shear. For example, if two plates with 1-inch thicknesses are connected by a bolt with a diameter (d) of 1 inch, and each plate is subjected to a force of 100 lb, then τ = 50 psi.
- 3). Calculate the shear stress using the formula τ = F/(2d*(t1+t2+t3)) if the bolt connects three plates, where the center plate experiences a force in one direction and the other two plates experience a force in the other direction. This load case is considered double shear because shear occurs in two different planes in the bolt. For example, if three plates with 1-inch thicknesses are connected by a bolt with a diameter (d) of 1 inch, and the plates are subjected to a force of 100 lb, then τ = 16.7 psi.
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