138 6. EXAMPLE PRACTICAL PROCEDURES AND RESULTS
(b)(a)
(c)
0
Depth µm
100 200 300 400 500 600 700 800 900
Residual Stresses MPa
800
600
400
200
0
-200
-400
-600
-800
-1000
-1200
Rosette F, longitudinal
Rosette G, longitudinal
F
F
G
Side F Side G
Figure 6.15: Shot peened steel beam, gauge installation and stress distributions (images courtesy
of Stresscraft Ltd.).
• Intense levels of compression have been detected at the top and bottom surfaces with
compressive stress maxima occurring at depths around 50 m.
• Tensile stress maxima occur around the mid-thickness; the overall balance of compressive
and tensile stresses for axial equilibrium appears to be satisfied.
• ere is a reasonable level of symmetry in the combined stress distribution from the two
gauges about the mid-thickness, with only a small dislocation in stress levels between the
two distribution lines.
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