Experimental Study to Calibrate Monotonic Micromechanics-Based Fracture Models of Q345 Steel

Abstract:

Micromechanics-based facture models have been proved to predict ductile fracture in steel structures with good accuracy. The stress modified critical strain (SMCS) model and the void growth model (VGM) are suitable to predict fracture initiation under monotonic loading. In order to calibrate the parameters in these models for the largely used Q345 steel in China, material tests, scanning electron microscope tests and finite element analyses were conducted. The test specimens were made from base metal, deposit metal and heat affected zone of Q345 steel to investigate crack initiation in welded connections. The results of this paper can be applied to predict ductile fracture in welded steel connections under monotonic loading.

• Periodical: Advanced Materials Research (Volumes 261-263)
• Pages: 545-550
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.261-263.545
• Online since: May 2011
• Authors: Fang Fang Liao, Wei Wang, Yi Yi Chen
• Keywords: Fracture, Micromechanical Model, Monotonic Loading, Parameter Calibration

References

[1] A.M. Kanvinde, G.G. Deierlein. Micromechanical simulation of earthquake-induced fracture in steel structures. Technical Rep. 145, John A. Blume Earthquake Engineering Center, Stanford University, California, 2004.

[2] J.W. Hancock, A.C. Mackenzie. On the mechanics of ductile failure in high-strength steel subjected to multi-axial stress states. Journal of the Mechanics and Physics of Solids, 1976, 24(3): 147–169.

DOI: 10.1016/0022-5096(76)90024-7

[3] J.R. Rice, D.M. Tracey. On the ductile enlargement of voids in triaxial stress fields. Journal of the Mechanics and Physics of Solids, 1969; 17(3): 201–217.

DOI: 10.1016/0022-5096(69)90033-7

[4] A.M. Kanvinde, G.G. Deierlein. Prediction of ductile fracture in steel moment connections during earthquakes using micromechanical fracture models. 13th World Conference on Earthquake Engineering, Vancouver, B.C., Canada, 2004, Paper No. 297.

[5] A.M. Kanvinde, G.G. Deierlein. Void growth model and stress modified critical strain model to predict ductile fracture in structural steels. Journal of Structural Engineering 2006; 132(12): 1907-1918.

DOI: 10.1061/(asce)0733-9445(2006)132:12(1907)

[6] A.M. Kanvinde, G.G. Deierlein. Finite-element simulation of ductile fracture in reduced section pull-plates using micromechanics-based fracture models. Journal of Structural Engineering 2007; 133(5): 656–664.

DOI: 10.1061/(asce)0733-9445(2007)133:5(656)