sentences:  The process of shearing a material may induce a volumetric strain along with the shear strain.In soil mechanics, the volumetric strain associated with shearing is known as Reynolds' dilation if it increases the volume, or compaction if it decreases the volume.The shear center (also known as the elastic axis or torsional axis) is an imaginary point on a section, where a shear force can be applied without inducing any torsion.