Strain & Poisson's Ratio | Mechanics of Solids

http://goo.gl/Y4NQzf for more FREE video tutorials covering Mechanics of Solids and Structural Mechanics This video demonstrates normal & shear strains, Poisson’s ratio & stress-strain relationships. First part of the video talks about normal strains recalling that normal stress tends to deform an object into an elongated shape or squashed shape. Strain is defined as the change in length divided by the original length & is a dimensionless quantity. And shear strain is defined as the angle change of the element & is also a dimensionless quantity. The video explains both the terminology- normal strain and shear strain vividly with necessary schematic diagrams. Moving on, the video briefly explains Poisson’s ratio which represents the ratio of transverse strain to normal strain when the stress-strain behavior is linear; successively talks about the assumptions made in Poisson’s ratio i.e., materials are linear elastic, homogeneous & isotropic etc. in details. The video, then, displays a graphical plotting of stress vs. strain diagram containing a stress-strain curve and illustrates the different points of the curve over the stress-strain diagram.