How to calculate the force required in this case?

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SUMMARY

The discussion focuses on calculating the average force per mm² acting on adhesives used to bond two printed circuit boards (PCBs) under a 50N force applied in X, Y, and Z directions. The adhesive thickness is specified as 1mm, and the challenge lies in determining the force distribution on the adhesive, which is not purely tensile or shear. Participants emphasize the importance of showing preliminary calculations to facilitate assistance.

PREREQUISITES
  • Understanding of basic mechanics and force distribution
  • Knowledge of adhesive properties and their behavior under load
  • Familiarity with PCB design and assembly
  • Basic mathematical skills for force calculations
NEXT STEPS
  • Research "Force distribution in adhesive bonding" to understand how forces are transmitted through adhesives.
  • Learn about "Tensile and shear stress calculations" to apply these concepts to adhesive scenarios.
  • Explore "Mechanical properties of adhesives" to comprehend how different adhesives react under load.
  • Investigate "Finite Element Analysis (FEA) for PCB assemblies" to simulate force effects on adhesive joints.
USEFUL FOR

Mechanical engineers, PCB designers, and students studying adhesive bonding in electronic assemblies will benefit from this discussion.

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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?

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