An Energy-Based Unified Approach to Predict the Low-Cycle Fatigue Life of Type 316L Stainless Steel under Various Temperatures and Strain-Rates

Materials

Jung-Seok Kim¹  Jae-Yong Lim²  NaeHyung Tak³ 

[1] Autonomous Vehicles Research Team, New Transportation Innovative Research Center, Korea Railroad Research Institute, Uiwang-si 16105, Korea;Department of Safety Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea;Division of Industrial Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Korea;

关键词: type 316L stainless steel;    low-cycle fatigue;    fatigue life prediction;    plastic strain energy density;    elevated temperature;   

DOI  :  10.3390/ma12071090

来源: DOAJ

【 摘 要 】

An energy-based low-cycle fatigue model was proposed for applications at a range of temperatures. An existing model was extended to the integrated approach, incorporating the simultaneous effects of strain rate and temperature. A favored material at high temperature, type 316L stainless steel, was selected in this study and its material characteristics were investigated. Tensile tests and low-cycle fatigue tests were performed using several strain rates at a temperature ranging from room temperature to 650 °C. Material properties were obtained in terms of temperature using the displacement-controlled tensile tests and further material response were investigated using strain-controlled tensile tests. Consequently, no pronounced reduction in strengths occurred at temperatures between 300 and 550 °C, and a negative strain rate response was observed in the temperature range. Based on the low-cycle fatigue tests by varying strain rates and temperature, it was found that a normalized plastic strain energy density and a strain-rate modified cycle were successfully correlated. The accuracy of the model was discussed by comparing between predicted and experimental lives.

【 授权许可】

Unknown