PSI - Issue 14

Filin V.Yu. et al. / Procedia Structural Integrity 14 (2019) 758–773 Author name / Structural Integrity Procedia 00 (2018) 000–000

760

3

elastic modulus

E

total applied strain (service plus residual strain)

e

yield strain

e Y

function accounting for the decrease of residual stress under a high load

f 1 f 2

function correlating the values of J and J el

f R6 boundary function between the safe and unsafe areas of failure assessment diagram (FAD) G elastic energy release rate J J-integral J c critical value of J-integral, a parameter of material J el elastic part of J-integral K I stress intensity factor (SIF) under Mode I loading K Ia SIF at a crack arrest, a parameter of material K Ic critical SIF at Mode I loading, a parameter of material ( K c ) J critical SIF calculated via J-integral K r relative SIF l crack length along the surface L specimen span or parallel length L r relative load M load moment m coefficient accounting for stress-strain state n 1 reserve factor in strength condition in terms of J-integral n 3 reserve factor in “absolute” strength condition in terms of J-integral n case reserve factor exponent accounting for the design case n i number of valid test outcomes at one temperature NDT nil ductility temperature P load Q constraint parameter r distance from crack tip S full thickness of a structural element ds element of the contour  t specimen thickness T temperature T d minimum design temperature T traction vector of the value  on the contour  defined in relation to an outward normal unit vector TKB ductile to cleavage transition temperature with big samples U elastic energy of the body u displacement vector V data variation coefficient v crack mouth opening displacement, CMOD v pl plastic part of CMOD W specimen width w strain energy density x distance ahead a crack tip in the crack plane

Y t , Y b dimensionless functions accounting for tension and bending Y r , Y a dimensionless functions for the examined flaw size and position