Session: MF-22-01 Materials and Fabrication: General Topics II

Paper Number: 61172

Start Time: Wednesday, July 14, 2021, 05:00 PM

61172 - Strain Based Damage Model Predictions of Ductile Crack Growth in Multiple Fracture Specimen Geometries 

Modeling damage and ductile crack growth in metallic materials has been of interest over the last four decades.  Damage models of increasing complexity have been employed to characterize and predict the ductile crack growth in materials.  A short review of the existing ductile crack growth models has been provided.  Recently, a strain-based damage model has been advanced by researchers that is capable of capturing the stress and strain states for the incipient damage within the material while being able to capture the triaxiality parameter.  In this work a strain based ductile fracture damage model has been employed to model specimens with three different crack geometries, namely two single-edge notch tension (SENT) specimens, compact-tension (CT) specimen, and axial surface-cracked pipe.  The predictions from the ductile crack growth model have been compared to experimental findings of the crack growth (obtained using a d-c Electric Potential measurement technique) and the corresponding load levels and crack opening displacements (CODs).  The points of differences between the experimental measurements and the fracture surface observations of crack growth and the predictions from the finite element modeling (FEM) approach have been discussed.  The findings provide credence to the applicability of the new approach for piping materials while providing a framework for flaw evaluations methodologies.

Presenting Author: Sureshkumar Kalyanam Engineering Mechanics Corporation of Columbus

Authors:

Sureshkumar Kalyanam Engineering Mechanics Corporation of Columbus
Lance Hill Engg. Mech Corp of Columbus
Gery Wilkowski Engg. Mech Corp of Columbus
Yunior Hioe Engg Mech Corp of Columbus
Frederick Brust Engg. Mech Corp of Columbus