Thin wall pressure vessel equations are used to estimate internal pressure. Lab 9 introduces several methods of measuring strain, primarily with strain gages. The different methods are compared. Strain Definitions Strain is a measure of deformation.
Normal strains turn squares into rectangles with all the corners remaining right angles.
Shear strains , denoted by g , measure the angle change of the corners of a square. Shear strains turn squares into diamonds. This example shows how the orientation of the coordinate system influences the perceived strain in an object. The blue square changes to a rectangle. Therefore only normal strains would be apparent for the coordinate orientation shown.