3.17 Numerical Examples
79
Fig. 3.9 Construction of Mohr’s strain circle
Fig. 3.10 Directions of
principal axes
ε max or ε min =
ε x +ε y
2
±
1
2
ε x − ε y
2 + γ 2
xy
∴ ε max or ε min =
−13+13
2
10
−6
±
1
2
(−13 − 13)10 −6
2 +
15 × 10 −6
2
∴ ε max or ε min = ±15 × 10
−6
Hence, ε max = 15 × 10
−6 and ε min = −15 × 10
−6 .