Application of the Master Curve in the ASME Code

Fracture toughness evaluation of 20MnMoNi55 pressure vessel steel in the ductile to brittle transition regime: Experiment & numerical simulations

“…Secondly, this approach does not deal with the inherent scatter of the fracture toughness values in the DBTT regime. Further, the indexing parameter (RT NDT ) is determined by using results of Charpy V-notch and drop weight tests which are not fracture mechanics based test methods and often leads to an over conservative prediction of fracture toughness in the DBTT regime [7].…”

Effect of notch acuity on the apparent fracture toughness

“…According to [15][16][17] the lower bound of fracture toughness of RPV-steels is related to the reference temperature T 0 as follows:…”

Evaluation and effect of loss of constraint on master curve reference temperature of 20MnMoNi55 steel

“…This assumption greatly simplifies the master curve method, since only one material specific parameter, T 0 , needs to be determined for a material condition. The parameter T 0 is defined as the temperature at which the median fracture toughness for 1T-CT fracture toughness specimen equals 100 MPa p m [6]. To apply T 0 as a measure of embrittlement for components in different situations, a consistent correlation is necessary between T 0 with thickness or crack to width ratio (a/W) of the specimen.…”

“…With increasing complexity of geometry and loading condition, three-dimensional analysis needs to be carried out to improve the degree of accuracy. Further in numerical analysis involving considerable plastic deformation, both the local value of the loading parameter and material resistance against fracture along the crack front influences the fracture resistance curve [6,7]. Various fracture criteria take this effect into consideration for prediction of failure.…”