select the Deformation
Vectors 
button in the toolbar, OR
select the Deformation
Vectors checkbox under the General tab of the Display Options 
dialog.
Deformation Vectors indicate the direction and relative magnitude of displacements at each grid point. To display Deformation Vectors:
select the Deformation
Vectors button in the toolbar, OR
select the Deformation
Vectors checkbox under the General tab of the Display Options dialog.
The Deformation Vectors are displayed as arrows at each grid point of the stress grid.
Deformation vectors displayed with Total Displacement contours
Size of Deformation Vectors
The relative size of the deformation vectors indicates the relative magnitude of displacements at each grid point. The absolute size of the deformation vectors can be customized with the Scale Factor option for Deformations, under the General tab of Display Options (a default scale factor is automatically in effect).
NOTE: the same Scale Factor is also used for the display of Deformed Boundaries.
Horizontal / Vertical Displacement Vectors
If you are viewing contours of Horizontal (X) Displacement then the Deformation Vectors will represent the X-component of the total displacement vector.
If you are viewing contours of Vertical (Y) Displacement then the Deformation Vectors will represent the Y-component of the total displacement vector.
For all other contour data (e.g. Sigma1, Strength Factor, Total Displacement) the Deformation Vectors will represent the total displacement vector.