Experimental investigation and crystal plasticity modeling of combined high and low cycle loading on AISI 4140 steel. (March 2023)

• Record Type: Journal Article
• Authors: Zhu, F.; Zhang, M.L.; Zhang, C.J.; He, P.F.; Dai, Y.
• Is Part Of: International journal of fatigue. Volume 168(2023)
• Publication Date: 2023-03
• Subjects: AISI 4140 steel -- High and low combined cycle fatigue -- Crystal plasticity FEM -- Fatigue life; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107465
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: A test platform was set up to investigate the combined high and low cycle fatigue behavior. A new CCF life prediction model is proposed based on CPFEM. The new model can predict fatigue life through parameters with clear physical meaning. Abstract: Combined low and high cycle loading of AISI 4140 steel during service has a significant effect on its fatigue performance, compared to pure low or high cycle loading. In this study, we analyzed the combined low and high cycle fatigue (CCF) responses of AISI 4140 steel under different frequency ratios (20%-30%), and stress amplitude ratios (100–1000). The results indicated that the higher the stress amplitude ratio and frequency ratio, the shorter was the fatigue life of CCF. The fatigue life prediction model was established based on the crystal plasticity theory, the fatigue indicator parameters were obtained from the microstructure evolution, and then fatigue life under different stress amplitude ratios and frequency ratios was predicted. Comparison of the predicted and experimental results demonstrated that the predicted lives were located within thrice the scatter band.