• Smith, Mike C.
• Sherry, Andrew H.
• Sheikh, Mohammad

Abstract

<jats:p>This paper describes an investigation concerning calibration of the Rousselier ductile damage model parameters for an industrial grade weld material (Esshete 1250). Parameters such as σ1 and the mesh size (Lc) were calibrated using numerical models of tensile and fracture toughness test specimens (smooth round bar and side-grooved compact-tension (CT) types) and adopting the Rousselier damage model as a constitutive relation. The process of parameter calibration was investigated by comparing the numerical load-displacement, crack initiation and growth predictions with experimental data measured using the two test geometries. It was found that it was not possible to obtain a single set of parameters which provided a good agreement between numerical predictions and experimental behaviour for both smooth tensile bar and CT specimen due to the difference in the failure mechanism of these specimens. Therefore, experimental J-R curve data determined from unload-compliance CT laboratory specimen fracture toughness tests of Esshete weld material were used to determine the values of these two parameters. The calibration results showed that the values of σ1 affect the change of the slope of J-R curve, whereas an increase in Lc elevates the crack growth resistance. The ductile fracture behaviour of the weld material is best simulated using the value of Lc = 50 μm and σ1 = 506 MPa. A detailed description of the numerical approach and calibration steps undertaken are provided.</jats:p>

Topics

• impedance spectroscopy
• crack
• fracture toughness
• liquid chromatography