Answer: Without an image or diagram of the assembly shown, it's difficult to provide a specific solution. However, we can provide some general guidance on how to approach the problem.
To determine the maximum value of the average normal stress in each link, you'll need to use the formula for average normal stress:
σ = F/A
where σ is the average normal stress, F is the force applied, and A is the cross-sectional area of the link.
First, you'll need to determine the forces in each link. This can be done using the equations of equilibrium for the entire assembly and for each joint. Once you have the forces in each link, you can use the formula above to determine the average normal stress.
For the pins, you can assume that the stress is uniform across the cross-sectional area of the pin. The maximum average normal stress will occur at the section of the pin with the smallest cross-sectional area.
Again, without more specific information or a diagram, it's difficult to provide a more detailed solution.