PSI - Issue 28

Romanin Luca et al. / Procedia Structural Integrity 28 (2020) 162–170 Author name / Structural Integrity Procedia 00 (2019) 000–000

170

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availability. Utilizing a non linear hardening model, such Chaboche model, requires the availability of parameters for high temperatures, a kinematic hardening model is thus more indicated. A numerical model of a critical T-joint, which has to maintain tolerances even during an earthquake, has been studied. The hysteresis effect has found to be limited to the first cycle only where a residual stresses redistribution occurs. The cause is the weld region which has hardened due to cooling shrinkage and phase transformation. With an appropriate weld size, the effect of hysteresis is negligible and a post weld heat treatment unnecessary. This type of analysis requires a CWM approach and could not be simplified more than the simplifications already assumed. The assessment of a welded joint for hysteresis due to seismic loads seems to require a modelling up to the weld scale but if residual stresses have also to be included in this kind of analysis is an interesting future topic. As matter of fact, CWM analyses are not straightforward and they could difficultly be included a in weld joint scale assessment which itself is not employed yet in the industrial practice. References Albuquerque, C. 2015. “Advanced Methodologies for the Assessment of the Fatigue Behaviour of Railway Bridges.” PhD Thesis. Bate, Steve, Neil Shallcross, and Karen Stone. 2016. “Development of Material Model Parameters Suitable for the Finite Element Simulation of Ferritic Welds.” : 1–8. Bendeich, P. J. et al. 2012. “Validated Numerical Analysis of Residual Stresses in Safety Relief Valve (SRV) Nozzle Mock-Ups: Influence of Axial Restraint on Distortion and Residual Stress Predictions.” Computational Materials Science 62: 285–88. Bruneau, M., C. Uang, and R. Sabelli. 2008. Animal Genetics Ductile Design of Steel Structures. Crisan, Andrei. 2016. “Material Calibration for Static Cyclic Analyses.” INTERSECTII/INTERSECTIONS 13(2): 44–59. Gong, Y. P., C. J. Hyde, W. Sun, and T. H. Hyde. 2010. “Determination of Material Properties in the Chaboche Unified Viscoplasticity Model.” Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. He, Jie, Wen Li Wang, and Han Chen. 2010. “Numerical Evaluation of Residual Stress Redistribution in Welded Bridge.” 2010 International Conference on Mechanic Automation and Control Engineering, MACE2010: 1586–89. Kanyilmaz, Alper. 2015. “Validation of Fiber-Based Distributed Plasticity Approach for Steel Bracing Models.” Civil Engineering Journal. Krolo, Paulina, Davor Grandić, and Željko Smolčić. 2016. “Experimental and Numerical Study of Mild Steel Behaviour under Cyclic Loading with Variable Strain Ranges.” Advances in Materials Science and Engineering 2016. Schenk, T., I. M. Richardson, M. Kraska, and S. Ohnimus. 2009. “A Study on the Influence of Clamping on Welding Distortion.” Computational Materials Science 45(4): 999–1005. Smith, Michael C., Ondrej Muránsky, Philip J. Bendeich, and Lyndon Edwards. 2010. “The Impact of Key Simulation Variables on Predicted Residual Stresses in Pressuriser Nozzle Dissimilar Metal Weld Mock-Ups. Part 1 - Simulation.” American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 6: 1483–94. Stoakes, C. D., and L. A. Fahnestock. 2014. “Three-Dimensional Finite Element Simulation of the Seismic Behavior of Multitier Concentrically Braced Frames.” In Structures Congress 2014 - Proceedings of the 2014 Structures Congress,. Versaillot, Pierre Darry, and Lect Ioan BOTH. 2017. “Effects of Cyclic Loading on the Mechanical Properties of Steel.” Universitatea Politehnica Timisoara, Romania.