Chapter 2
Analysis of Strain
2.1 Concept of Strain
The load application on a body of material will in general cause the body to deform which results in displacement of individual points within the body itself. Such a displacement due to deformation of the body must be distinguished from rigid body displacement in which the body as a whole will move. The tendency of the body to resist the deformation introduces internal forces over any section of the body, and stress is defined as this internal force per unit area. Exactly in the same way the strain will be defined as the measure of deformation of any line element in the body. Thus strain is defined as the ratio of the change in the length of any line element to its original length.
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