Fatigue Damage Analysis of an Asphalt Mixture Based on Pseudostiffness
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The fatigue damage characteristics of an asphalt mixture were analyzed, a new fatigue damage model was constructed based on the Schapery pseudovariable theory and continuum damage mechanics. According to the Schapery theory and the generalized elastic-viscoelastic correspondence principle, the experimental stress–strain curves of the asphalt mixture are transformed into the stress vs. pseudostrain curves. The relation between stress and pseudostrain is shown to be linear, which eliminates the viscoelastic hysteresis effect of the asphalt mixture and its time dependence. Pseudostiffness decreases gradually with the number of fatigue cycles. The damage variable is defined by the change in pseudostiffness. The parameters of the fatigue damage model are verified by fatigue tests up to 1000 cycles, and the fatigue damage for 2000 cycles is predicted and compared with the test results, which are in good agreement between themselves.
Keywordsfatigue damage pseudostrain fatigue lifetime viscoelasticity pseudostiffness
This work was supported by the National Natural Science Foundation of China (11572275), the Key Laboratory of Road Structure and Material of Ministry of Transportation (Beijing) and the Hunan Provincial Innovation Foundation for Postgraduate, China (CX2018B074).
- 5.H. X. Guan, J. L. Zheng, and Q. S. Zhang, “Viscoelastic fatigue damage model of bituminous mixture,” Mech. Eng., 29, No. 2, 50–53 (2007).Google Scholar
- 6.H. Z. Zhu, H. Yan, and B. M. Tang, “Damage model of interaction between fatigue and creep for asphalt mixture,” China J. Highway Transport, 24, No. 4, 15–20 (2011). (in Chinese)Google Scholar
- 7.Y. R. Kim, Modeling of Asphalt Concrete, ASCE Press (2008), p. 164.Google Scholar
- 9.R. M. Christensen, Theory of Viscoelasticity, Academic Press, New York (1982).Google Scholar
- 11.F. M. Liu and D. Y. Wang, “Multiscale simulation of damage evolution of asphalt mixtures,” China J. Highway Transport, 23, No. 2, 1–6 (2010). (in Chinese)Google Scholar
- 12.Y. Q. Zhao, J. M. Tang, and L Bai, “Determination of relaxation modulus using complex modulus of asphalt mixture,” J. Build. Mater., 15, No. 4, 498–502 (2010).Google Scholar
- 13.W. Cao, A. Norouzi, and Y. R. Kim, “Application of viscoelastic continuum damage approach to predict fatigue performance of BinZhou perpetual pavements,” J. Traffic Transport. Eng., 3, No. 2, 104–115 (2016). (in Chinese)Google Scholar
- 14.J. K. Chen, Z. P. Huang, H. J. Chu, and S. L. Bai, “Nonlinear viscoelastic constitutive relations based on the rate sensitive relaxation time under the condition of uniaxial stress,” Acta Polym. Sin., 138, No. 3, 415–417 (2003).Google Scholar
- 15.G. M. Chen, Y. Q. Tan, Z. R. Wang, and Y. W. Zhang, “Fractal study of grading curve trend of the asphalt mixtures,” J. Highway Transport. Res. Dev., 22, No. 1, 2–4 (2005).Google Scholar
- 16.JTG E20-2011. Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering [in Chinese], China Communication Press, Beijing (2000).Google Scholar
- 18.J. L. Zheng and S. T. Lv, “Nonlinear fatigue damage model for asphalt mixtures,” China J. Highway Transport, 22, No. 5, 21–28 (2009). (in Chinese)Google Scholar