4.7 Article

Uncoupled fracture model for E250, E350, and E450 grades of structural steel under monotonic loading

Journal

ENGINEERING FRACTURE MECHANICS
Volume 292, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2023.109638

Keywords

Stress triaxiality; Lode function; Ductile fracture initiation; Uncoupled damage model; Fracture locus

Categories

Ask authors/readers for more resources

This study extracts 48 specimens from three structural steel grades used in the Indian construction industry and simulates the stress states of ductile fracture initiation. Through testing and numerical modeling, ductile fracture initiation parameters are extracted and a three-dimensional fracture locus is constructed. Additionally, a new ductile fracture model is proposed and compared with existing models, showing better prediction accuracy.
Forty-eight specimens with four notch specimen configurations have been extracted from three structural steel grades used in the Indian construction industry. The extracted specimen simulates stress states of ductile fracture initiation similar to the sacrificial element installed in seismic-resistant steel structures. All the specimens are monotonically tested under a displacement-controlled loading protocol. With the help of a universal testing machine and digital image correlation, the load versus notch elongation until the point of ductile fracture initiation has been captured for all the specimens. A validated numerical model is then developed to extract the ductile fracture initiation parameters, namely stress Triaxiality (T), Lode function (L - xi or theta or L-p), and Equivalent Plastic Strain (PEEQ). The extracted T, L, and PEEQ are then used to construct a three-dimensional fracture locus for all three study grades. In addition, a new uncoupled ductile fracture model named the Exponential based Lode parameter Void Growth Model (ELVGM) is proposed to predict the point of ductile fracture initiation and is then compared with six well-established existing uncoupled ductile fracture models using eight error measures. The proposed ELVGM with two free parameters is observed to provide better prediction accuracy for both low and high-yield strength steel corresponding to the considered stress states.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available