Loading rate and holding load dependent room temperature nanoindentation creep behavior of 60NiTi alloy: individual and coupling effects

2021 ◽  
Author(s):  
Wanjun He ◽  
Qunfeng Zeng ◽  
Chao Yan ◽  
Jianing Zhu ◽  
Danli Zhang ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Room Temperature ◽  
Loading Rate ◽  
Coupling Effects

Room Temperature Creep Behavior and its Effect on Tensile Properties of CP-Ti

2017 ◽  
Author(s):  
Le Chang ◽  
Changyu Zhou ◽  
Xiaohua He
Keyword(s):  
Tensile Properties ◽  
Creep Strain ◽  
Creep Behavior ◽  
Room Temperature ◽  
Loading Rate ◽  
Temperature Creep ◽  
Creep Stress ◽  
Room Temperature Creep ◽  
Stress Dependent ◽  
Cp Ti

Commercial pure titanium (CP-Ti) is an attractive material, due to its good properties such as high strength, high specific work hardening ability, excellent plasticity, toughness, corrosion resistance and weld ability. It is commonly used in pressure vessels, such as heat exchangers, pumps, valves and so on. It has been reported that the room temperature creep has a great influence on the failure of titanium pressure vessel. In this paper, in order to investigate room temperature creep behavior and its effect on tensile properties of CP-Ti, both creep and tensile experiments were carried out. According to creep experiment results, CP-Ti shows strong stress dependent creep behavior at the creep stress higher than 305MPa. On the contrary, the strong loading rate dependent creep behavior occurs at the creep stress lower than 305MPa. Besides, creep strain of CP-Ti can be reduced by pretension. As pretension reaches 6%, creep behavior of CP-Ti is completely suppressed at the creep stress of 320MPa. Subsequent tensile test results show that the occurrence of room temperature creep obviously enhances the strength of CP-Ti. With the increase of creep strain and loading rate in previous creep tests, the yield strength and tensile strength of CP-Ti increase.

Multi-scale indentation creep behavior in Fe-based amorphous/nanocrystalline coating at room temperature

2021 ◽  
Vol 283 ◽  
pp. 128768
Author(s):  
Anil Kumar ◽  
Sapan Kumar Nayak ◽  
Atanu Banerjee ◽  
Tapas Laha
Keyword(s):  
Creep Behavior ◽  
Room Temperature ◽  
Indentation Creep ◽  
Nanocrystalline Coating ◽  
Multi Scale

Enhanced Room Temperature Magnetoelectric Coupling Effects in c ‐axis Oriented Polycrystalline BaSrCo 2‐ x Mg x Fe 11 AlO 22

2021 ◽  
Author(s):  
Xing‐Han Chen ◽  
Kun Zhai ◽  
Guo‐Yu Qian ◽  
Qing‐Shan Fu ◽  
Chiranjib Chakrabarti ◽  
...  
Keyword(s):  
Room Temperature ◽  
Magnetoelectric Coupling ◽  
Coupling Effects ◽  
Oriented Polycrystalline

Critical concentration of Mg addition for plastic instabilities in Al–Mg alloys

2000 ◽  
Vol 15 (5) ◽  
pp. 1037-1040 ◽  
Author(s):  
N. Q. Chinh ◽  
F. Csikor ◽  
Zs. Kovács ◽  
J. Lendvai
Keyword(s):  
Room Temperature ◽  
Loading Rate ◽  
Critical Concentration ◽  
Solute Concentration ◽  
Mg Alloys ◽  
Depth Sensing ◽  
Solute Content ◽  
Mg Addition ◽  
Constant Loading Rate ◽  
Al Mg Alloys

Plastic instabilities were investigated by the depth-sensing microhardness test in binary high-purity Al–Mg alloys with different Mg contents. During the tests the applied load was increased from 0 to 2000 mN at constant loading rate. The instabilities appeared as characteristic steps in the load–depth curves during indentation. It was shown that the occurrence and development of the plastic instabilities depend strongly on the solute content. Furthermore, the plastic instabilities occurred only when the solute concentration was larger than a critical value, C0. From room-temperature tests on Al–Mg alloys, C0 was found to be 0.86 wt% Mg. The critical concentration, which is necessary to get plastic instabilities, was also interpreted theoretically.

Compressive creep behavior of an electric brush-plated nanocrystalline Cu at room temperature

2009 ◽  
Vol 106 (8) ◽  
pp. 086105 ◽  
Author(s):  
Guoyong Wang ◽  
Jianshe Lian ◽  
Zhonghao Jiang ◽  
Liyuan Qin ◽  
Qing Jiang
Keyword(s):  
Creep Behavior ◽  
Room Temperature ◽  
Compressive Creep

Study on the mutual interactions between the parameters of a CANON system and its coping strategy when operating at room temperature (15 to 25 °C) using response surface methodology

2014 ◽  
Vol 69 (9) ◽  
pp. 1805-1812 ◽  
Author(s):  
Jian Zhou ◽  
Guangxu Qin ◽  
Jianbing Zhang ◽  
Yancheng Li ◽  
Qiang He ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Removal Efficiency ◽  
Coping Strategy ◽  
Room Temperature ◽  
Loading Rate ◽  
Nitrogen Loading ◽  
Independent Variables ◽  
Do Concentration ◽  
N Loading

The coping strategy of a CANON (completely autotrophic nitrogen removal over nitrite) reactor working at room temperature was investigated using response surface methodology. The total nitrogen (TN) removal efficiency was taken as a dependent variable. The temperature (X), dissolved oxygen (DO) concentration (Y), and influent nitrogen loading rate (Z) were taken as independent variables. Results showed that the relation of these three independent variables can be described by the TN removal efficiency expressed as −5.03 + 1.51X + 45.16Y + 30.13Z + 0.26XY + 1.84XZ − 0.04X2 − 9.06Y2 − 99.00Z2. The analysis of variance proved that the equation is applicable. The response surface demonstrated that the temperature significantly interacts with the DO concentration and influent N loading rate. A coping strategy for the CANON reactor working at room temperature is thus proposed: altering the DO concentration and the N loading rate to counterbalance the impact of low temperature. The verification test proved the strategy is viable. The TN removal efficiency was 91.3% when the reactor was operated under a temperature of 35.0 °C, a DO of 3.0 mg/L, and a N loading rate of 0.70 kgN/(m³ d). When the temperature dropped from 35.0 to 19.2 °C, the TN removal efficiency was kept at 88.7% by regulating the influent N loading rate from 0.7 kgN/(m³ d) to 0.35 kgN/(m³ d) and the DO concentration from 3.0 to 2.6 mg/L.

Modeling of Nonlinear Viscoelastic Creep of Polycarbonate

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Wenbo Luo ◽  
Said Jazouli ◽  
Toan Vu-Khanh
Keyword(s):  
Creep Behavior ◽  
Room Temperature ◽  
Multiple Integral ◽  
Model Fit ◽  
Viscoelastic Creep ◽  
Commercial Grade ◽  
Nonlinear Viscoelastic ◽  
Schapery Model ◽  
Special Case ◽  
Better Than

AbstractThe creep behavior of a commercial grade polycarbonate was investigated in this study. 10 different constant stresses ranging from 8 MPa to 50 MPa were applied to the specimen, and the resultant creep strains were measured at room temperature. It was found that the creep could be modeled linearly below 15 MPa, and nonlinearly above 15 MPa. Different nonlinear viscoelastic models have been briefly reviewed and used to fit the test data. It is shown that the Findley model is a special case of the Schapery model, and both the Findley model and the simplified multiple integral representation are suitable for properly describing the creep behavior of the polycarbonate investigated in this paper; however, the Findley model fit the data better than the simplified multiple integral with three terms.

Effect of hydrogen on creep behavior of Ti-6AI-4V alloy at room temperature

1991 ◽  
Vol 18 (6) ◽  
pp. 1125-1130 ◽  
Author(s):  
G. Y. Gao ◽  
S. C. Dexter
Keyword(s):  
Creep Behavior ◽  
Room Temperature
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