Issue 33

M. Sakane et alii, Frattura ed Integrità Strutturale, 33 (2015) 319-334; DOI: 10.3221/IGF-ESIS.33.36

n

( )

p A 

 

(1)

In the equation, A is the strain hardening coefficient and n the strain hardening exponent.

(a)

(b)

Figure 2 : Strain path (a) and strain sequence (b) .

Figure 3 : Cyclic stress-strain curves of five materials under proportional and nonproportional loadings.

Proportional

Nonproportional

Materials

n P

A P

n NP

A NP

(MPa)

(MPa)

SUS304 Pure Ca Pure Ni Pure Al 6061 Al

0.13 0.18 0.12 0.12 0.11

830 520 740 110 270

0.22 0.30 0.12 0.12 0.11

1860 1330

940 110 270

Table 2 : Cyclic hardening coefficient and exponent.

321