{"id":1562,"date":"2024-07-29T17:30:55","date_gmt":"2024-07-29T17:30:55","guid":{"rendered":"https:\/\/svestudy.com\/?page_id=1562"},"modified":"2025-05-12T19:42:56","modified_gmt":"2025-05-12T19:42:56","slug":"ame-unit-3-q6","status":"publish","type":"page","link":"https:\/\/svestudy.com\/?page_id=1562","title":{"rendered":"AME Unit 3 Q6"},"content":{"rendered":"\n
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(a) Describe how a Brinell hardness test is carried out.(3)
(b) With reference to a ball race bearing, explain EACH of the following terms:
(i) brinelling;(2)
(ii) false brinelling.(2)
(c) Explain how false brinelling can be reduced in practice.(3)<\/p>\n\n\n

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Brinell Hardness Test<\/p>\n\t\t\t

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Brinell hardness testing<\/strong> is a method used to determine the hardness of a material by measuring the size of an indentation caused by a hardened steel ball pressed into the material under a specific load.<\/a><\/a><\/p>\n\n\n\n

Process:<\/h3>\n\n\n\n
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  1. Indentation:<\/strong> A hardened steel ball of a specified diameter (usually 10mm) is pressed into the surface of the material with a defined force (typically 3000kgf) for a specific time (usually 10-30 seconds). \u00a0 <\/a>1. Material Hardness – University of Maryland <\/a><\/a><\/a><\/a>web.calce.umd.edu<\/a><\/a><\/li>\n\n\n\n
  2. Measurement:<\/strong> The diameter of the indentation left by the ball is measured. \u00a0 <\/a>1. For applied load P kg, diameter of ball D mm and diameter of indentation d mm, the Brinell hardness number is given by – Testbook <\/a><\/a><\/a><\/a>testbook.com<\/a><\/a><\/li>\n\n\n\n
  3. Calculation:<\/strong> The Brinell hardness number (BHN) is calculated based on the applied load and the diameter of the indentation. \u00a0 <\/a>1. Brinell scale – Wikipedia <\/a><\/a><\/a><\/a>en.wikipedia.org<\/a><\/a><\/li>\n<\/ol>\n\n\n\n

    Formula:<\/h3>\n\n\n\n