The 0.2% proof stress is used to define the yield stress for some metals. a) true b) false

TRUE

Explanation:

the statement given is TRUE

0.2 % proof stress is used to define the yield stress of some statement is a right statement.

For, some metals  proper yielding point is not defined for the materials so, to define the yield stress of that  metals we uses prof stress of 0.2%.

Brittle material does not have yielding point so for that we use 0.2% proof stress example cast iron.

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