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Which of the following hardness testing method is preferred for aircraft manufacturing purposes?

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Which of the following hardness testing method is preferred for aircraft manufacturing purposes?

(a) Brinell hardness

(b) Rockwell hardness

(c) Divider method

(d) Shore scleroscope hardness

I have been asked this question during an online exam.

Query is from Aircraft Materials in chapter Testing Aircraft Materials of Aerospace Materials & Processes

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Right option is (b) Rockwell hardness

The explanation: The method of hardness testing usually preferred for aircraft manufacturing purposes is the Rockwell hardness method. This is because it is easy to operate and is reliable. Divider method is used to determine the yield point of a material. It is not a hardness testing method.

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