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Prediction of Strain Fatigue Life of HRB400 Steel Based on Meso-Deformation Inhomogeneity

by Lili Jin 1,2, Bin Zeng 1, Damin Lu 1, Yingjun Gao 1,3 and Keshi Zhang 1,4,*
1
Key Lab of Disaster Prevent and Structural Safety, Guangxi Key Lab Disaster Prevent and Engineering Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
2
Urban Construction and Transportation Engineering Department, Guangxi Polytechnic of Construction, Nanning 530007, China
3
School of Physical Science and Technology, Guangxi University, Nanning 530004, China
4
College of Civil and Architectural Engineering, Nanning University, Nanning 530200, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1464; https://doi.org/10.3390/ma13061464
Received: 27 February 2020 / Revised: 17 March 2020 / Accepted: 19 March 2020 / Published: 23 March 2020
The relationship between strain fatigue life and evolution of meso-deformation inhomogeneity was studied, through the cyclic process of numerical simulation of crystal plasticity compared with the fatigue test of steel hot-rolled ribbed-steel bar 400 (HRB400). The statistical characterization parameters at grain level, including the standard deviation of the dot product of longitudinal stress and strain, the product of the macro stress and the standard deviation of the longitudinal strain, and the product of the macro stress ratio and the standard deviation of the longitudinal strain, were proposed and respectively applied to measure the meso-deformation inhomogeneity of materials. These parameters take the effect of peak stress into account, distinct from the pure strain statistical parameters. The numerical results demonstrate that the low-cycle fatigue life curves of materials are predictable using the new parameters as FIPs (fatigue indicator parameters), and the predictions are more rational than by utilizing the FIPs without considering the peak stress effect. View Full-Text
Keywords: strain inhomogeneity; crystal plasticity; BCC; polycrystalline RVE; fatigue indicator parameter; fatigue life prediction strain inhomogeneity; crystal plasticity; BCC; polycrystalline RVE; fatigue indicator parameter; fatigue life prediction
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Jin, L.; Zeng, B.; Lu, D.; Gao, Y.; Zhang, K. Prediction of Strain Fatigue Life of HRB400 Steel Based on Meso-Deformation Inhomogeneity. Materials 2020, 13, 1464.

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