Civil and Environmental Engineering 2202A/B Study Guide - Final Guide: Sign Convention
7 Dec 2018
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Document Summary
Determine normal and shear strain in engineering applications. Deformation is a change in the shape and size of a body. It can be highly visible or practically unnoticeable. Deformation is generally not uniform throughout a body"s volume and may change along it. When a force is applied to a body. Axial deformation (elongation/contraction) per unit of length is referred to as strain. It can sometimes be expressed as strain % as it is often very small. If we know strain, then we can approximate the final length of something by rearranging. Lateral deformation (change in angle b/w two line segments that were perpendicular) is referred to as shear strain. This is usually given by an angle, denoted by and measured in radians. The /2 is just for sign convention as when <90, it"s + shear and > 90 is - shear.
