Predicting Low Cycle Fatigue Life through Simulation of Crack in Cover Plate Welded Beam to Column Connections

Document Type: Research Paper

Authors

School of Civil Engineering, University of Tehran, Tehran, Iran

Abstract

This paper presents a low cycle fatigue life curve by simulating a crack in a cover plate welded moment connection. Initiation of ductile fracture in steel is controlled by growth and coalescence of micro-voids. This research used a numerical method using finite element modeling and simulation of ductile crack initiation by a micromechanical model. Therefore, a finite element model of a cover plate welded moment connection was developed in ABAQUS software, and a FORTRAN subroutine was used in order to simulate cracking in the connection model. Thus, each crack location and the number of cycles to initiate the crack were detected. Utilizing cyclic void micromechanical model of growth analysis, which is a technique to predict fracture in a ductile material, six different cover plate connections (divided in three categories) were modeled in the steel moment frame, and then their critical points to trigger the crack were identified. Finally, for the cover plate moment connection, considering the constant amplitude of loading curves data and in order to present the low cycle fatigue life prediction, displacement versus the number of half cycles diagram is produced.

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[1] Kaufmann, E., Fisher, J., Di. Julio, R., Gross, J., 1997, “Failure analysis of welded steel moment frames damaged in the Northridge earthquake”. Gaithersburg, Md: NISTIR, 5944.

[2] Kanvinde, A. M., 2004, “Micromechanical simulation of earthquake-induced fracture in steel structures”, Ph.D. Thesis, Stanford University.

[3] Iyama, J., Ricles, J. M., 2009, “Prediction of fatigue life of welded beam-to-column connections under earthquake loading”. Journal of structural engineering, 135(12), pp. 1472-1480.

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

[5] Kanvinde, A., Deierlein, G., 2007 “Cyclic void growth model to assess ductile fracture initiation in structural steels due to ultra low cycle fatigue”. Journal of engineering mechanics, 133(6), pp. 701-712.

[6] Fell, B. V., 2008, “Large-scale testing and simulation of earthquake-induced ultra low cycle fatigue in bracing members subjected to cyclic inelastic buckling”. University of California.

[7] Ajaei,B., Ghassemieh, M., 2015, “Reinforcing fillet welds preventing cracks in partial joint penetration welds”. International Journal of Steel Structures, 15(2), pp. 487-497.

[8] Ajaei, B., Ghassemieh, M., 2013, “Applicability of damage indices for detection of cracking in steel moment connections”. Journal of Rehabilitation in Civil Engineering, 1(2), pp. 1-9.

[9] Lim, C., Choi, W., Sumner, E. A., 2012, “Low cycle fatigue life prediction using a four-bolt extended unstiffened end plate moment connection”. Engineering Structures, 41, pp. 373-384.

[10] Amiri, H., Aghakouchak, A., Shahbeyk, S., Engelhardt, M., 2013, “Finite element simulation of ultra low cycle fatigue cracking in steel structures”. Journal of Constructional Steel Research, 89, pp. 175-184.

[11] Zhou, H., Wang, Y., Yang, L., Shi, Y., 2014, “Seismic low-cycle fatigue evaluation of welded beam-to-column connections in steel moment frames through global–local analysis”. International Journal of Fatigue, 64, pp. 97-113.

[12] Bai, Y., Kurata, M., Flórez-López, J. and Nakashima, M., 2016. “Macro-modeling of Crack Damage in Steel Beams Subjected to Nonstationary Low Cycle Fatigue”. Journal of Structural Engineering, 142(10), p.04016076.

[13] Liu, Y., Jia, L.J., Ge, H., Kato, T. and Ikai, T., 2017. “Ductile-fatigue transition fracture mode of welded T-joints under quasi-static cyclic large plastic strain loading”. Engineering Fracture Mechanics, 176, pp.38-60.

[14] Pereira, J., de Jesus, A., Xavier, J., Fernandes, A., 2014, “Ultra low-cycle fatigue behavior of a structural steel”. Engineering Structures, 60, pp. 214-222.

[15] Ermelj, B., Moe, P., Sinur, F., 2016, “On the prediction of low-cycle fatigue in steel welded beam-to-column joints”. Journal of Constructional Steel Research, 117, pp. 49-63.

[16] Liao, F., Wang, W., Chen, Y., 2015, “Ductile fracture prediction for welded steel connections under monotonic loading based on micromechanical fracture criteria”. Engineering Structures, 94, pp. 16-28.

[17] Tong, L., Huang, X., Zhou, F., Chen, Y., 2016, “Experimental and numerical investigations on extremely-low-cycle fatigue fracture behavior of steel welded joints”. Journal of Constructional Steel Research, 119, pp. 98-112.

[18] Lemaitre, J.,Chaboche, L., 1990, “Mechanics of Solid Materials”, Cambridge University Press.

[19] Nia, Z. S., Mazroi, A., Ghassemieh, M., 2014, “Cyclic performance of flange-plate connection to box column with finger shaped plate”. Journal of Constructional Steel Research, 101, pp. 207-223.

[20] AISC., 2005, AISC 341-05. “Seismic provisions for structural steel buildings”. Chicago (IL): American Institute of Steel Construction.

[21] Correa, S. R., de Campos, M. F., Marcelo, C., de Castro, J. A., Fonseca, M. C., Chuvas, T., Padovese, L. R., 2016, “Evaluation of Residual Stresses in Welded ASTM A36 Structural Steel by Metal Active Gas (MAG) Welding Process”. Paper presented at the Materials Science Forum.2.3023