PSI - Issue 42

Diego F. Mora et al. / Procedia Structural Integrity 42 (2022) 224–235 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Elastic modulus [MPa] Concentrated force [N]

E F

( ) F  x

Crack tip functions Heaviside function

H

Ic G

Energy release rate [MPa·m]

Ic K Ia K

Material fracture toughness for initiation [MPa·m 0.5 ] Material fracture toughness for arrest [MPa·m 0.5 ]

L

Length of the cylinder [m]

O

Origin of coordinates

a

Crack depth [m]

COD

Crack opening displacement [m]

i a , i  b

Vector of degrees of freedom assigned to each node

Inner pressure [MPa]

p

r

Crack tip radial coordinate [m]

c r

Critical radius from the crack tip to the maximum principal stress [m]

Nil-ductility transition reference temperature [°C]

NDT RT , , R Z 

Cylindrical coordinates

Inner radius of the cylinder [m] Outer radius of the cylinder [m]

i R

o R

Radius of enrichment Initial temperature [°C]

enrichment R

0 T

T

Temperature [°C]

XFEM u

Displacement field for XFEM Nodal displacement vector

u

, z U U 

Tangential and axial displacement [m] Wall thickness of the cylinder [m]

wt 3D FE

Three dimensional

Finite element

LOCA

Loss of Coolant Accident Nodal shape functions

i N

PTS, TS

Pressurized Thermal Shock, Thermal Shock

RPV

Reactor Pressure Vessel

Nil-ductility transition reference temperature [°C]

RT NDT

I K ,

II K Stress Intensity Factor in mode I and II

SIF,