Issue 48

A. Zakharovet alii, Frattura ed Integrità Strutturale, 48 (2019) 87-96; DOI: 10.3221/IGF-ESIS.48.11 96 N OMENCLATURE ε strain σ stress σ 0 yield stress E Young’s modulus n strain hardening exponent α strain hardening coefficient ν Poisson’s ratio σ f ultimate stress G T tangent modulus Γ 0 cohesive energy T 0 cohesive stresses c n  normal cohesive separation defining fracture K 1, K 2, K 3 elastic stress intensity factors I n governing parameter at the crack tip w 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 σ m hydrostatic stresses 0 /    f f  true ultimate stress normalized by yield stress dV dW strain energy density r distance from the crack tip η biaxial stress ratio