Calibration of cohesive parameters for fracture test simulations of sub-sized bend specimens of AM steels

Wu, Shengjia; Pan, Jwo; Korinko, Paul S.

doi:10.1007/s10704-022-00629-z

Calibration of cohesive parameters for fracture test simulations of sub-sized bend specimens of AM steels

Journal Article · Thu Aug 25 04:00:00 EDT 2022 · International Journal of Fracture (Online)

DOI:https://doi.org/10.1007/s10704-022-00629-z· OSTI ID:1894908

Wu, Shengjia ^[1]; Pan, Jwo ^[1]; Korinko, Paul S. ^[2]

Univ. of Michigan, Ann Arbor, MI (United States)
Savannah River National Laboratory (SRNL), Aiken, SC (United States)

In this work, crack extensions in sub-sized side-grooved bend specimens of AM steels are examined with changing cohesive parameters. Two-dimensional FE analyses are first conducted to simulate crack extensions by nodal release. The simulation results indicate the near-tip maximum opening stress and separation work rate increase and then slightly decrease for the bend specimens. The hydrogen-charged bend specimens have lower near-tip maximum opening stresses and average separation work rates than those of the uncharged bend specimens. The changing near-tip maximum opening stresses and the separation work rates with increasing crack extension are determined as references for the changing cohesive strengths and energies, respectively. Two-dimensional FE analyses with different changing cohesive parameters are then performed. The simulation results with calibrated cohesive parameters can match well with the test results. The hydrogen-charged specimens have the lower changing cohesive strength vs crack growth curves compared with those of the uncharged specimens. The hydrogen-charged specimens have either lower or similar changing cohesive energy vs crack growth curves compared with those of the uncharged specimens. Finally, a three-dimensional FE analysis is conducted to simulate crack extension by nodal release in one bend specimen to examine the stress triaxialities in front of the growing crack fronts at different locations from the center plane to the planes near the side groove front with increasing crack extension to identify possible physical reasons for the changing cohesive parameters.

View Accepted Manuscript (DOE)

Research Organization:: Savannah River Site (SRS), Aiken, SC (United States); Savannah River National Lab (SRNL), Aiken, SC (United States)

Sponsoring Organization:: USDOE Office of Environmental Management (EM)

Grant/Contract Number:: 89303321CEM000080

OSTI ID:: 1894908

Report Number(s):: SRNL-STI-2022-00153

Journal Information:: International Journal of Fracture (Online), Journal Name: International Journal of Fracture (Online) Journal Issue: 1 Vol. 239; ISSN 1573-2673

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Calibration of cohesive parameters for fracture test simulations of sub-sized bend specimens of AM steels

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