Engineering Board Exam Reviewer · Engineering Materials · hard
A Brinell test uses a 10 mm ball under a load of 3000 kgf and produces an indentation 4.0 mm in diameter. What is the Brinell hardness number?
- 239
- 114
- 229
- 23.9
Answer
C. 229
Solution
BHN = 2P/[π D(D - D2 - d2)] = 6000/[π (10)(10 - sqrt(84))] = 229.
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