Issue 75

V. Thondamon et alii, Fracture and Structural Integrity, 75 (2026) 88-103; DOI: 10.3221/IGF-ESIS.75.08

Crack length, a = a 0 + Δ a = 91.26 mm Half crack angle, θ = 0.58 rad Applied moment, M b = 63 kNm

Yield stress, σ y = 386.6 MPa Ultimate stress, σ u = 666 MPa Young’s modulus, E = 220 GPa Poisson’s ratio, μ = 0.3 Initiation J-integral, J Ic = 266 kJ/m2 b. Limit load moment: b.1. Zahoor 1989: Expression:                2 1 2 2 4 cos sin L m f M R t where, flow stress, 2 y u f      Result: M L = 128 kNm b.2. Takahashi: Expression:       2 1 2 2 4 cos sin L m y M R t          Result: M L = 94 kNm c. Stress intensity factor Ainsworth et al. 2016: Expression:

b b b K F a    2 b b m M R t   

   

   

 

 

1.5

4.24

b F A  



1 4.5967

2.6422

0.25





  

0.25  

A

m R t

0.125



Result: K b = 157 MPa √ m

d. Fracture resistance: d.1. Initiation fracture toughness (Suranjit et al. 2014): Expression: ' Ic Ic K J E    2 1 ' E E    Result: K Ic = 254 MPa √ m

d. 2. J-integral using load-CMOD method by Kamaya 2018: Expression: A p = Area under plastic part of load-CMOD curve

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