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I have been trying to find a method of calculating the yield stress for a material when only given;

-The loading type (Two bars soldered together in tension)

-The dimensions of the shaft and solder (ie thickness of solder, length, cross sectional area)

-The Ultimate Tensile Strength of the solder

-Poisson's ratio of the solder

-The yield and ultimate tensile strength (UTS) of the shafts

The UTS of the solder is much smaller than that of the shafts so I assume that that is where it is failing first. I feel like not enough parameters are provided to produce a solution, due to not being provided the strain hardening index, the stress co-efficient or Young's modulus.

An assumption I have been thinking of using is that since the solder is very thin (0.07 cm) and is made of Silver, the UTS of the solder can be approximately equal to the yield strength. But that seems too simple for what I have been given to work with.

Am I missing something? Any advice is appreciated.