PSI - Issue 52

A.D. Cummings et al. / Procedia Structural Integrity 52 (2024) 762–784 A. Cummings / Structural Integrity Procedia 00 (2023) 000–000

763

2

Nomenclature

a Crack depth B Wall thickness c Half crack length C Constant in master curve equations C v Charpy V-notch impact energy C us v Average upper shelf energy E Young’s modulus F y Yield stress reduction factor J J-integral J C Critical value of J at onset of crack growth J D Dynamic J-integral K Stress intensity ˙ K Rate of stress intensity factor K C Critical value of stress intensity at onset of crack growth K I Stress intensity for mode 1 loading K JD Dynamic stress intensity based on J K s J Elastic plastic stress intensity based on secondary stresses K mat Material fracture toughness K c mat Material fracture toughness considering constraint e ff ects K r Fracture ratio

L r Plastic collapse ratio (cracked body) L r , u Plastic collapse ratio (uncracked body) p Short ligament length of embedded flaw p f Probability of failure P Design load P L Limit load (plastic collapse limit)

P m Primary membrane stress P b Primary bending stress Q m Secondary membrane stress Q b Secondary bending stress T Test temperature

T cv Lowest temperature at which the Charpy test data are available T K Temperature describing the scatter in charpy vs toughness correlation T 27 J Temperature for an average energy of 27J measured in a standard 10mm x 10mm Charpy V-notch specimen T 0 , st Temperature term used in Master Curve Maximum Likelihood Method (MML) T 0 Master curve reference temperature t f Time to fracture W Plate width elong Engineering strain at elongation ν Poisson’s ratio ρ Mass density σ y Yield stress σ yRT Yield stress at room temperature σ y − 40 ◦ C Yield stress at -40 ◦ C σ uts Ultimate (engineering) stress σ m Membrane stress σ b Bending stress