3-64 The strain rosette shown in Fig. P3-64 was used to obtain
normal strain data at a point on the free surface of a 2024-
T4 aluminum alloy (v = 0.30) machine part. The gage read-
ings were $\epsilon_a$ = +525 $\mu$m/m, $\epsilon_b$ = +450 $\mu$m/m, and $\epsilon_c$ =
+1425 $\mu$m/m. Determine the principal strains at this point,
and show the principal strain deformations on a sketch.
y
Gage c
Gage b
90°
45°
x
Gage a
