Numerical Simulation of Fatigue Crack Growth of New-Material Track Rollers

Abstract:

Because of the excellent mechanical properties of Austempered Ductile Iron (ADI), track rollers can be made out of this material. The casting may lead to cracks forming inside rollers and there will also be some scratches in the surface when rollers work, which will greatly affect the lifespan of rollers. It is helpful to use crack propagation method based on the Finite Element Method (FEM) to simulate the crack growth. Firstly, define the position and the value of the force imposed on rollers. If the load is compressive, contact pairs should be set between the crack surfaces. After the model is established, Stress Intensity Factors (SIF) KI and KII can be calculated with the node displacement theory by using the commands of FEM software. With the maximum principal stress theory, crack growth direction can be determined. Since the values of KI and KII calculated by the software are positive, we should judge weather the values are positive or negative to get a right propagating angle. The analysis applies linear elastic fracture mechanics and FEM modeling the crack propagation in the elastic state.

• Periodical: Applied Mechanics and Materials (Volumes 157-158)
• Pages: 1471-1476
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.157-158.1471
• Online since: February 2012
• Authors: Chang Liu, Xu Hong Guo, Xin Xin Gao
• Keywords: Austempered Ductile Iron, Fatigue Crack Growth (FCG), Finite Element Analysis (FEA), Stress Intensity Factor (SIF)

References

[1] K. Aslantas, S. Tasgetiren. Modelling of spall formation in a plate made of austempered ductile iron having a subsurface-edge crack. J. Computer Material Science, 29 (2004): 29～36.

DOI: 10.1016/s0927-0256(03)00091-0

[2] K. Aslantas , S. Tasgetiren. A study of spur gear pitting formation and life prediction. J. Wear 257 (2004): 1167～1175.

DOI: 10.1016/j.wear.2004.08.005

[3] L. Magalhaes, J. Seabra, C. Sa, Experimental observations of contact fatigue crack mechanisms for austempered ductile iron (ADI) discs. Wear 246 (2000) 134-148.

DOI: 10.1016/s0043-1648(00)00493-2

[4] M. Kuna, M. Springmann, K. Madler, P. Hubner, G. Pusch. Fracture mechanics based design of a railway wheel made of austempered ductile iron [J]. Engineering Fracture mechanics. 72 (2005): 241-253.

DOI: 10.1016/j.engfracmech.2003.10.007

[5] Liu jincheng, Sun guoxiong. The fatigue strength of ADI. Morden casting, 5 (2003): 1-5.

[6] Wang Wei. Research on the influence and mechanism of the heat treatment parameters on mechanical properties of ADI [C].

[7] C.L. Tan, Y.L. Gao, Treatment of biomaterial interface crack problems using the boundary element method, Eng. Fract. Mech. 36 (6) (1990) 919-932.

DOI: 10.1016/0013-7944(90)90268-l

[8] P.C. Paris, F. Erdogan, A critical analysis of crack propagation laws, J. Basic Eng. 85 (1963) 528-534.

DOI: 10.1115/1.3656902