Issue 43

F. Majid et alii, Frattura ed Integrità Strutturale, 43 (2018) 97-105; DOI: 10.3221/IGF-ESIS.43.07

P ur P u P a P 0

is the ultimate residual pressure.

is the ultimate pressure corresponding to an undamaged HDPE specimen.

is the pressure just before the rupture. is the endurance limit’s corresponding pressure.

is the circumferential stress. is the radius of the pipe specimen. is the thickness of the pipe specimen.

σ θ R

t

a is the notch depth D is the damage (D = 0 for neat material, D = 1 for completely damaged material). β (a/t) = (n/N f ) is the life fraction

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