A Graphic Resolution of Strain

A purely graphic procedure is developed for the resolution of strain data obtained from measurements by strain rosettes of any shape. The characteristic features of the procedure arc: (a) The diagram is constructed directly from the measured data, without necessitating even addition; (b) strains are represented by distances measured in the true directions; (c) the true directions of principal strain are shown; (d) the true sense of rotation of straight lines is shown. The development of the procedure affords a purely geometric proof of the representation of the state of two-dimensional strain by Mohr’s circle.