K/J value estimation of different specimen types containing dissimilar metal welds

The scope of this paper are analytical and numerical J-integral calculations on three standard specimens namely compact tension (CT) specimen, three-point single edge notch bending (3P-SENB) specimen and single edge notch tension (SENT) specimen with two different crack length versus specimen width ratios each. The performed calculations are the first part of a mini round robin exercise within the FP7 project MULTIMETAL, whose main goals are the development of a standard for fracture resistance testing for multi-metallic specimen and the development of harmonized procedures for the integrity assessment of dissimilar metal welds (DMWs) as they appear in primary piping systems of light water reactors (LWRs). Within the round-robin exercise the project partners have to perform numerical Jintegral analyses on multi-metalic specimen that are extracted from different mock-ups containing DMWs. In a preliminary step each participating organization has to perform numerical J-integral calculations on fictitious homogeneous specimens, which are assumed to be entirely made of Inconel 52. The numerical results of the preliminary step are compared to analytical solutions taken from literature. The numerical results presented in this paper are the preliminary step results of JRC. For the CT specimens analytical and numerical J-integral solutions are in perfect agreement, where as for the SENB and the SENT specimens analytical and numerical J-integral values only agree for loads up to approximately 60% and 50% respectively of the corresponding limit loads. For higher loads analytical and numerical J-integral values deviate and the deviation reaches around 30% at the limit loads of the two specimens, which requires an in-depth study of the theory behind the analytical solutions for SENB and SENT specimen.

MARTIN Oliver;  MACHINA Gangadhar;  SIMONOVSKI Igor; 

2013-09-10

iASMiRT22

JRC82604