20.500.12556/DKUM-92195 Effects of fixture configurations and weld strength mismatch on J-integral calculation procedure for SE(B) specimens This work presents the development of a J-integral estimation procedure for deep and shallow cracked bend specimens based upon plastic ηpl factors for a butt weld made in an S690 QL high strength low alloyed steel. Experimental procedures include the characterization of average material properties by tensile testing and evaluation of base and weld metal resistance to stable tearing by fracture testing of square SE(B) specimens containing a weld centerline notch. J-integral has been estimated from plastic work using a single specimen approach and the normalization data reduction technique. A comprehensive parametric finite element study has been conducted to calibrate plastic factor ηpl and geometry factor λ for various fixture and weld configurations, while a corresponding plastic factor γpl was computed on the basis of the former two. The modified ηpl and γpl factors were then incorporated in the J computation procedure given by the ASTM E1820 standard, for evaluation of the plastic component of J and its corresponding correction due to crack growth, respectively. Two kinds of J-R curves were computed on the basis of modified and standard ηpl and γpl factors, where the latter are given by ASTM E1820. A comparison of produced J-R curves for the base material revealed that variations in specimen fixtures can lead to ≈10% overestimation of computed fracture toughness JIc. Furthermore, a comparison of J-R curves for overmatched single-material idealized welds revealed that the application of standard ηpl and γpl factors can lead to the overestimation of computed fracture toughness JIc by more than 10%. Similar observations are made for undermatched single material idealized welds, where fracture toughness JIc is overestimated by ≈5%. metal weld strength mismatch fracture plastic correction factors fixture rollers J-R resistance curve zvarni spoji trdnostna neenakost mehanika loma plastični korekcijski faktorji pritrdilni valji J-R uporna krivulja true false true MDPI AG Angleški jezik Slovenski jezik https://www.mdpi.com/journal/materials © 2022 by the authors Članek v reviji 2025-03-20 09:46:37 2025-03-20 09:46:37 2025-03-21 03:10:50 0000-00-00 00:00:00 2022 0 0 str. 1-24 iss. 3 Vol. 15 Jan. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2021-11-30 2022-01-19 2022-01-26 621.791:539.42 95190531 10.3390/ma15030962 1996-1944 materials-15-00962-v2.pdf materials-15-00962-v2.pdf 1 089A8FD5C4FDD66889C447D7FE5BD244 e1b7a55b9501b87e525cb2b2beba9b1e89fd978da87f323d065a36c329de3f8e 29f42ee1-0568-11f0-9be3-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189506 https://www.mdpi.com/1996-1944/15/3/962 0 2f223d25-0568-11f0-9be3-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189507 Fakulteta za strojništvo 0 0 0