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Unformatted text preview: Chapter 9: Mechanical Behavior 9.1 ASTM Standards Objectives Describe the use of ASTM standards. GI 9.1.1 If you wanted to determine how strong aluminum is, propose an experiment to measure it. Be as detailed as you can about how you would do the measurement, what kind of equipment you would need, etc. The American Society for Testing and Materials (ASTM) writes standards for how to conduct tests and specifications for materials. You can find almost any test you want how to measure density, strength, refractive index, resistance to chemicals, and hundreds of others. These tests have been created by a group of experts, and are then checked by having different labs use them to see if the instructions are clear and if they can get the correct answer. Specifications give requirements that materials must have to be used in certain applications. In a separate file in the Class Worksheets and Reading folder on the website is part of one of these standards. Use this standard to answer the following questions. GI 9.1.2 What is the name and numerical designation for this standard? GI 9.1.3 What is this a standard for? GI 9.1.4 Which section of the standard describes the equipment you will need? GI 9.1.5 Which section of the standard describes the types of specimens you should use? 9.2 Stress-Strain Curves Objectives Calculate mechanical properties. Draw and identify stress-strain curves for different materials. One of the most important aspects of materials are how they respond to forces. This response determines their stiffness, elasticity, resistance to deformation, resistance to breaking, and many other properties. Understanding these properties is a key aspect of being able to choose the correct material for a particular application and to use it effectively. To begin we need to understand stress and strain. You are probably used to thinking in terms of force and deformation. However, the response of a material to force depends on the size of the piece we have. For example, think about trying to bend a thin copper wire versus a copper pipe; it takes a lot more force to bend the pipe than it does to bend the wire. a copper pipe; it takes a lot more force to bend the pipe than it does to bend the wire....
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- Spring '08