metal-tests - then applied The indentation(d by the major...

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TESTS ON METALS 1. TENSION TEST - to obtain stress-strain diagram & the following properites: (A) Yield Strengths at certain offset (B) Ultimate Tensile Strength (C) Elastic Modulus (D) % Elongation at failure (measure of ductility) 2. HARDNESS TEST (A) Brinell Hardness test Brinell Hardness Number (BHN) = load mass/ indented area = p / [ π D/2 ( D - % (D 2 - d 2 ) ) ] (B) ROCKWELL HARDNESS TEST A minor load is first applied to seat the indenter.
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Unformatted text preview: then applied. The indentation (d) by the major load is then measured. Rockwell B Rockwell C Indenter 1/16 in. diam Diamond steel ball Cone Major Load 100kg 150kg Rockwell B number= 130 - (d / 2μm) Rockwell C number= 100 - (d / 2μm) Rockwell testers are usually calibrated to give the Rockwell numbers directly. *Results of hardness tests can be used to estimate the ultimate strength of metals....
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