Please help describe the purpose of the fixturing of this aluminum specimen bein

Question

Please help describe the purpose of the fixturing of this aluminum specimen being tested for stress concentration. A device to connect a strain gauge to the specimen is attached to the side of the specimen. At the bottom of the specimen, it is connected by a brass pin that is meant to break before the specimen plastically deforms. The second pin, just above the screw, is made of steel. The plate in the clamp is also made of aluminum and to be bolted to the bottom fixturing. I would like to know why the plate is also made of aluminum, why the second pin is steel, what type of joints connect the different parts of the fixturing, and why a harness like device for the strain gauge wires is attached.

Explanation / Answer

Steel pin is used because it has high toughness and strength also it is a corrosive resistant. And aluminum plate is used because it's density is very less almost one third of steel. Inspire of it's low weight it is very strong

There are different types of joints used in this machine they are screw joint , knukle joint, rotational joint.

The wires of the strain gauge is connected to that device to measure resistance between them accurately

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