PPT Slide
Although the exact arrangement of atoms along AD is not known, it is generally agreed that Fig. 10-8 closely represents the atomic arrangement in a plane normal to the edge dislocation AD.
The atomic arrangement results in a compressive stress above the slip plane and a tensile stress below the slip plane.
An edge dislocation with the extra plane of atoms above the slip plane, as in Fig 10-8, by convention is called a positive edge dislocation and is frequently indicated by the symbol .