Multiaxial low cycle fatigue behavior and life prediction of CP-Ti under non-proportional stress-controlled mode
Tian-Hao Ma
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Search for more papers by this authorCorresponding Author
Chang-Yu Zhou
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Correspondence
Chang-Yu Zhou, School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China.
Email: [email protected]
Search for more papers by this authorLe Chang
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Search for more papers by this authorXiao-Hua He
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Search for more papers by this authorTian-Hao Ma
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Search for more papers by this authorCorresponding Author
Chang-Yu Zhou
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Correspondence
Chang-Yu Zhou, School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China.
Email: [email protected]
Search for more papers by this authorLe Chang
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Search for more papers by this authorXiao-Hua He
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing, China
Search for more papers by this authorFunding information: National Natural Science Foundation of China, Grant/Award Numbers: 51905260, 51975271; Postgraduate Research & Practice Innovation Program of Jiangsu Province
Abstract
Multiaxial low cycle fatigue tests under non-proportional stress (NPSS) controlled mode were performed on commercial pure titanium (CP-Ti). Strain responses of axial and torsional channels under highly applied stress amplitudes show an initial hardening phenomenon. Non-proportional hardening coefficient of CP-Ti is independent of the controlled mode. The critical plane of CP-Ti under NPSS controlled mode is aligned with the maximum principal stress plane proved by optical microscopy observation. Optimized FSM model and KBM-PM model with mean axial and torsional strain are established. These models are further integrated into equations related to multiaxial stress ratio with high accuracy of life prediction for CP-Ti under NPSS controlled mode.
Highlights
- Non-proportional hardening coefficient of CP-Ti is independent of the controlled mode.
- The critical plane of CP-Ti is aligned with the maximum principal stress plane.
- Energy and optimized critical plane model with mean strain are established.
CONFLICTS OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Open Research
DATA AVAILABILITY STATEMENT
Research data are not shared.
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