Issue 48

A. Zakharovet alii, Frattura ed Integrità Strutturale, 48 (2019) 87-96; DOI: 10.3221/IGF-ESIS.48.11

N OMENCLATURE

ε σ

strain stress

σ 0 E

yield stress

Young’s modulus

n α

strain hardening exponent strain hardening coefficient

ν

Poisson’s ratio ultimate stress tangent modulus cohesive energy cohesive stresses

σ f

G T

Γ 0 T 0

normal cohesive separation defining fracture

c



n

K 2,

K 3

K 1,

elastic stress intensity factors

I n w

governing parameter at the crack tip

width of the specimen

K Q

critical value of the elastic stress intensity factor

θ

polar angle

ij i u  ~,~

dimensionless angular functions of stresses and displacements

σ e

equivalent stresses hydrostatic stresses

σ m

true ultimate stress normalized by yield stress

/ 







0

f

f

strain energy density

dV dW

r

distance from the crack tip

η

biaxial stress ratio

96