Issue 48

R. Nikhil et alii, Frattura ed Integrità Strutturale, 48 (2019) 523-529; DOI: 10.3221/IGF-ESIS.48.50 525 As per Ernst et al. [12,13], if limit load (P L )can be expressed in terms of independent functions of crack length ( a ) and load- line displacement (Δ pl ) then η can be calculated based on P L .     pl L GaF P   . (5) Assuming the material behavior to be ideal plastic, Chattopadhyay et al. [14] proposed η as a P P L L    1  (6) knowing P L , the eq. (6) issued for heterogeneous C(T) specimens. P L could be evaluated by analytical solutions available in open literature [15] or Twice elastic slope (TES) / Twice elastic deflection (TED) or FE based yield contour (FYC) plot across the ligament. In present study P L has been obtained (i) based on TES method from FEM simulated load-displacement plots and (ii) FE-yield contour plot across the ligament of C(T) specimen. Figure 2 : Meshed CT geometry with constraints. Figure 3 : Limit load vs a/ W using various approaches. Figure 4 : Schematic of weld C(T) specimen. Figure 5 : Bilinear stress strain plot.