182 Ch a p t e r S i x
FIGURE 6.5 Illustration of σ
recovery process. σ 0
t
t 1
O
a. the stressing process
ε
ε ε
c e
ε ε
e e
t
t 1
O
b. the straining process
FIGURE 6.6 Illustration of
stressing and straining of ε
an elastic process. 0
t
O
a. the straining process
σ
t
O
b. the stress relaxation