EIT Mechanical Review: For the Discipline Specific Fundamentals of Engineering Exam, Second Edition

Strain

Stress in a member is always accompanied by strain in the ratio ? = ?/E where:

? = strain, m/m; ? = stress, Pa; and E = Modules of Elasticity, Pa.

Example 6-2

Q:

In the above example, if the supporting wire is 10.00 m long, how much will it stretch (elongate) when the mass is attached it?

Answers

Q:

The modules of elasticity of steel is given in the FE Handbook as 2.1 10 11 Pa ? = 49.93 10 6/(2.1 10 11) = 237.8 10 -6 m/m The total strain (elongation), then equals- ?L = ? L = 10 237.8 10 -6 = 237.8 10 -5 m or 2.378 mm

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