How to calculate the force required in this case?

koii123 · Oct 26, 2013

Homework Statement

I have two PCB (printed circuit board), and they are glued by adhesives, as show in the pictures.
And the location of the adhesives are indicated on the picture (please notice that NO adhesive is applied between the PCB boards).

50N force is applied on the upper PCB for each case (X, Y and Z directions). The objective of the use of the adhesive is to prevent the PCB from moving. And i need to calculate how much force per mm2 acting on the adhesive.

Suppose the adhesive applied is 1mm thick. How to calculate the average force acting on the adhesive in terms of N/mm2 in each case?

i have tried to find the answer, but i don't think my answers are correct. Because the forces acting the adhesive don't look like pure tensile or shear forces.

Can someone please help?

CAD diagram of a 3mm upper PCB glued onto a 3mm lower PCB, with a 50N upward force arrow along Z, labelled dimensions 25mm, 10mm, 15.5mm and 80mm, and glue on both sides and along one edge.

CAD diagram of a 3mm thick upper PCB glued onto a 3mm thick lower PCB, with adhesive strips on both side edges, dimensioned 25mm, 10mm, 15.5mm and 80mm, and a 50N arrow pulling the upper board along the Y-direction.

CAD diagram of a thin upper PCB glued onto a larger lower PCB, with dimensions 25mm, 10mm, 15.5mm and 80mm, adhesive marked on both ends and along one edge, and a 50N arrow pulling the upper board along X.

phinds · Oct 26, 2013

We can only help after you have shown your work. Read the forum rules.

How to calculate the force required in this case?

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