I’m working on shear allowable strength for joints for a few combinations of fasteners and sheet materials. I want to use MMPDS as the main sours of data. Now I take data from MMPDS and draw a diagram. The diagram shows how shear allowable strength depends on a thickness of sheet material. This diagram is typical and can be easily found in lots of books. I put 4 points on the diagram, which are A B C D. Zone between points A and B are bearing critical zone. Zone CD is shear critical. This is clear. And zone between points B and C called transition zone.
Question 1. What kind of failure occurs in this transitional zone?
Question 2. Why the curve changes its inclination so rapidly at point B?
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