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To find a true hardness reading for hard steel, the minimum thickness required for material is ____(a) 0.0027mm(b) 6.858mm(c) 0.27mm(d) 234mmThis question was posed to me by my school principal while I was bunking the class.My enquiry is from Aircraft Materials topic in chapter Testing Aircraft Materials of Aerospace Materials & Processes |
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Answer» RIGHT option is (B) 6.858mm To explain: To obtain the Rockwell hardness value, the loads used or penetrators DEPENDS on the weather the MATERIAL is soft or hard. The minimum thickness required for hard steel is 6.858mm. This will give an accurate hardness value. |
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