Cyclic Stress and Diametral Strain Response During High Strain Amplitude Fatigue of a 1Cr-1.3Mo-0.3V Bainitic Rotor Steel at Elevated Temperature—Part II

1986 ◽  
Vol 14 (6) ◽  
pp. 277
Author(s):  
A Wolfenden ◽  
KA Rahka ◽  
C Laird
Keyword(s):  
Elevated Temperature ◽  
Strain Amplitude ◽  
High Strain ◽  
Cyclic Stress ◽  
Rotor Steel ◽  
Strain Response ◽  
High Strain Amplitude

Effect of high strain amplitude and pre-deformation on damping property of Fe-Mn alloy

2019 ◽  
Vol 770 ◽  
pp. 252-256 ◽  
Author(s):  
Haijun Wang ◽  
Hui Wang ◽  
Ruiqian Zhang ◽  
Rui Liu ◽  
Yu Xu ◽  
...  
Keyword(s):  
Strain Amplitude ◽  
High Strain ◽  
Damping Property ◽  
High Strain Amplitude

scholarly journals Analysis of the Effective and Internal Cyclic Stress Components in the Inconel Superalloy Fatigued at Elevated Temperature

2011 ◽  
Vol 278 ◽  
pp. 393-398 ◽  
Author(s):  
Miroslav Šmíd ◽  
Martin Petrenec ◽  
Jaroslav Polák ◽  
Karel Obrtlík ◽  
Alice Chlupová
Keyword(s):  
Strain Amplitude ◽  
Effective Stress ◽  
Stress Amplitude ◽  
Cyclic Hardening ◽  
Cyclic Stress ◽  
Step Test ◽  
Total Strain Amplitude ◽  
Strain Response ◽  
Stress Strain ◽  
Stress Components

Cyclic multiple step test in strain control have been performed on cylindrical specimens of cast polycrystalline Inconel 738LC and 792-5A superalloys at 800 °C in laboratory atmosphere. Hysteresis loops were analyzed according to the statistical theory of hysteresis loop. The effective and internal stress components were evaluated. The effective stress of γ´ precipitate has significant influence on the stress-strain response both materials. The stress amplitude in IN 792-5A is higher than in IN 738LC at approximately same total strain amplitude due to significantly higher effective stress of γ´ phase. Cyclic hardening/softening curves and cyclic stress-strain curves using short-cut procedure were obtained. Cyclic hardening/softening behavior depends both on temperature and strain amplitude. Low amplitude straining is characterized by the saturation of the stress amplitude. In high amplitude straining slight softening was found. The cyclic stress-strain curves for both materials can be fitted by power law. Cyclic stress-strain response in terms of internal and effective stress components is discussed in relation to microstructural parameters of the materials. The observation of surface relief revealed the presence of persistent slip markings.

Internal friction mechanism of Fe–19Mn alloy at low and high strain amplitude

2013 ◽  
Vol 560 ◽  
pp. 837-840 ◽  
Author(s):  
Shuke Huang ◽  
Wenrong Huang ◽  
Jianhui Liu ◽  
Jin Teng ◽  
Ning Li ◽  
...  
Keyword(s):  
Internal Friction ◽  
Strain Amplitude ◽  
High Strain ◽  
Friction Mechanism ◽  
High Strain Amplitude

scholarly journals Effects of Thermal Aging on the Low Cycle Fatigue Behaviors of Cast Duplex Stainless Steels

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 378 ◽  
Author(s):  
Shilei Li ◽  
Yanli Wang ◽  
Xitao Wang
Keyword(s):  
Fatigue Life ◽  
Strain Amplitude ◽  
Thermal Aging ◽  
High Strain ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Premature Failure ◽  
High Strain Amplitude ◽  
Cleavage Cracking ◽  
Fracture Morphologies

The low cycle fatigue (LCF) behaviors of cast duplex stainless steel (CDSS) thermally aged at different times were investigated under different strain amplitudes. The effects of thermal aging on the LCF lives of CDSS are closely related to the strain amplitude. At a low strain amplitude, the fatigue life of the material increases significantly after thermal aging, while the LCF life decreases with an increasing aging time at a high strain amplitude. After thermal aging at 400 °C for 10,000 h, the fatigue fracture morphologies of CDSS change from fatigue fringes to mixture features including fatigue fringes in austenite and cleavage cracks in ferrite. Severe plastic deformation in ferrite of the aged CDSS under a high strain amplitude causes the cleavage cracking of ferrite. The premature failure of ferrite accelerates the propagation of fatigue crack and shortens the fatigue life at a high strain amplitude.

Large, thermally stabilized and fatigue-resisted piezoelectric strain in textured relaxor-PbTiO3 ferroelectric ceramics

2021 ◽  
Author(s):  
Yunfei Chang ◽  
Jie Wu ◽  
Bin Yang ◽  
Hang Xie ◽  
Shuai Yang ◽  
...  
Keyword(s):  
High Strain ◽  
Ferroelectric Ceramics ◽  
Strain Response ◽  
Output Stability ◽  
Piezoelectric Strain ◽  
Electronic Actuator

Piezoceramics with both high strain response and excellent output stability are strongly demanded for electronic actuator applications. Unfortunately, enhanced strains are generally accompanied by temperature and E-field instabilities for relaxor-PbTiO3...

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