hardness - ME 266 Solid Mechanics Laboratory 1 Yeditepe...

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Unformatted text preview: ME 266 Solid Mechanics Laboratory 1 Yeditepe University – Department of Mechanical Engineering Laboratory Manual Hardness Test Section 1: Instructor: Prof. Mehmet Akgun Room: A711 Phone: x1439 Email: [email protected] Assistant: Ender Alper Top Room: A705 Phone: x1753 Email: [email protected] Meeting time & place: Friday 11:00-13:00 Room B019 Section 2: Instructor: Asst.Prof. Fethi Okyar Room: A709 Phone: x1464 Email: [email protected] Assistant: Kerem Leblebici Room: A713 Phone: x1468 Email: [email protected] Meeting time & place: Friday 09:00-11:00 Room B019 Abstract The mechanical properties of materials are ascertained by perform- ing carefully designed laboratory experiments that replicate, as nearly as practical, the service conditions. Factors to be considered include the na- ture of the applied load(s), its duration and the applicable environmental conditions. It is possible for the load to be tensile, compressive, or shear, and its magnitude may be constant with time, or it may fluctuate con- tinuously. Application time may be for only a fraction of a second, or it may extend over a period of many years. Service temperature can also be an important factor. Mechanical properties are of concern to a variety of parties (e.g., producers and material consumers, research organizations and government agencies) that have differing interests. Consequently, it is imperative that there be some consistency in the manner in which tests are conducted, and in the interpretation of their results. This consistency is accomplished by using standardized testing techniques. Establishment and publication of these standards are often coordinated by professional societies. In the United States the most active organization is the ASTM 1 ; its Annual Book of ASTM Standards comprises numerous volumes that are updated yearly. A large number of the ASTM Standards are related directly to mechanical testing techniques including specifications for mea- suring the hardness of materials. This document was adopted from the Impact and Hardness Test Mate- rials Laboratory Report Manual developed in Louisiana State University by Eyassu Woldesenbet and Henry Tan [ 1 ], and hereby the author ac- knowledges their valuable work. Contents 1 Objective 2 1 ASTM: American Society for Testing and Materials 1 OBJECTIVE 2 2 Background 2 2.1 Statistical Considerations . . . . . . . . . . . . . . . . . . . . . . 2 2.1.1 Chauvenet’s Criterion . . . . . . . . . . . . . . . . . . . . 2 2.1.2 Normal Distribution Probability Log Plot . . . . . . . . . 3 2.2 Hardness Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2.1 The Rockwell Hardness Test . . . . . . . . . . . . . . . . 6 2.2.2 The Brinell Hardness Test . . . . . . . . . . . . . . . . . . 8 2.3 Correlation between Hardness and Tensile Strength . . . . . . . . 9 3 Equipment 9 4 Lab Procedure 9 5 Lab Requirements 11 6 Questions 11 1 Objective The main objective of this experiment is to introduce an important basic me-...
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This note was uploaded on 11/06/2010 for the course MECHANICAL me266 taught by Professor François during the Spring '10 term at Yeditepe Üniversitesi.

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hardness - ME 266 Solid Mechanics Laboratory 1 Yeditepe...

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