The Brinell test cannot be used with very soft or very hard materials. WHY ?
Homework Answers
Brinell hardness test consists of a testing ball that is made of sintered carbide and is allowed to press on the material and then the impression made by the ball on the material is examined.
This test is not suitable for hardened surface layers or hard materials because the ball is unable to penetrate into the material properly. The carbide ball gets deformed due to higher loads.
Thin sheets or soft materials are not tested because of the bulging of the material taking place on the other side of the sheet.
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Brinell test cannot be used with very soft or very hard materials.
WHY ?
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2.59 The Brinell hardness test is used to measure the indentation hardness of materials. It involves penetration of an indenter, in the form of a ball of diameter D (mm), under a load P (kg) as shown in Fig. 2.13a. The Brinell hardness number (BHN) is defined as 2P where A (in mm2) is the spherical surface area and d (in mm) is the diameter of...
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