Evident Glass Relaxation at Room Temperature Manifested by Size Effect

2021 ◽  
Author(s):  
Boyang Sun ◽  
Wenhui Cao ◽  
Zijian Wang ◽  
B. A. Sun ◽  
WeiHua Wang
Keyword(s):  
Size Effect ◽  
Room Temperature ◽  
Glass Relaxation

Time to Failure Size Effect for Tensile Creep Specimens

2014 ◽  
Vol 627 ◽  
pp. 185-188 ◽  
Author(s):  
Krzysztof Nowak
Keyword(s):  
Size Effect ◽  
Cross Section ◽  
Material Properties ◽  
Room Temperature ◽  
Creep Condition ◽  
Specimen Size ◽  
Tensile Creep ◽  
Time To Failure ◽  
Tension Specimen ◽  
Series Of Experiments

Size effect for tension specimen in creep condition is not very well recognised phenomenon. The Weibull’s works on influence of nonhomogeneity of material properties on its strength suggest that such effect should take place also for creep. The most of authors regard that the stress redistribution occurring during creep considerably reduces size effect. To examine it the author performed a series of experiments for thin tin alloy wires creeping in room temperature as well as some numerical simulations. The results confirmed the existence of size effect for time to failure. The numerical analysis was made for time of first macroscopic damage occurrencet1and for time of cross-section failuret2. Both these parameters show the influence of specimen size according to size effect law, but the dependence of parametert1was more pronounced.

Size effect of indium antimonide at room temperature

1973 ◽  
Vol 16 (1) ◽  
pp. 188-202 ◽  
Author(s):  
Yu-Tung Yang ◽  
Hong-Tzer Ho ◽  
Cheng-Chih Pei ◽  
Shung-Chen Yang ◽  
Biao-Shian Yu
Keyword(s):  
Size Effect ◽  
Indium Antimonide ◽  
Room Temperature

SIZE EFFECT OF FLOW STRESS IN ISOTHERMAL UPSETTING DEFORMATION

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1745-1750
Author(s):  
BIN GUO ◽  
CHUNJU WANG ◽  
DEBIN SHAN ◽  
LINING SUN
Keyword(s):  
Grain Size ◽  
Flow Stress ◽  
Size Effect ◽  
Room Temperature ◽  
Size Dependence ◽  
Treatment Process ◽  
Different Dimensions ◽  
Single Grain ◽  
The Difference ◽  
Different Grain Size

With the miniaturization of parts, size effect occurs. The isothermal forming processes are performed to obtain homogenizing deformation. In the paper, a serial of isothermal upsetting tests are carried out with billets of different dimensions. Difference of flow stress is accepted as the parameter to evaluate the size dependence of flow stress on billets dimensions. The experimental results show that size effect occurs clearly. With the increasing of temperature, the difference of flow stress becomes smaller, which means that the degree of size dependence is reduced. Scatter of flow stress is observed in the tests at room temperature. When the deformation temperature is raised, the fluctuation of flow stress tends towards decreasing. In order to investigate the effect of grain size, different grain size is obtained with the heat treatment process. At the same temperature, the difference of flow stress increases with the increasing of grain size. These phenomena can be explained from the viewpoint of polycrystalline structure of material. The anisotropy of individual grain is appeared obviously, which leads the fluctuation of flow stress. In the isothermal deformation, the effect of single grain is smaller than that at room temperature.

Grain Size Effect on Room Temperature Fatigue and Creep-Fatigue Behavior of OFHC Copper

2007 ◽  
Vol 52 (3) ◽  
pp. 521-525 ◽  
Author(s):  
Xiao Pan ◽  
Xianglin Wu ◽  
Geng Fu ◽  
James F. Stubbins
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Room Temperature ◽  
Fatigue Behavior ◽  
Ofhc Copper ◽  
Grain Size Effect ◽  
Creep Fatigue

Room temperature generation of terahertz radiation from a grating-bicoupled plasmon-resonant emitter: Size effect

2007 ◽  
Vol 90 (6) ◽  
pp. 061105 ◽  
Author(s):  
Yahya Moubarak Meziani ◽  
Taiichi Otsuji ◽  
Mitsuhiro Hanabe ◽  
Takuma Ishibashi ◽  
Tomohiro Uno ◽  
...  
Keyword(s):  
Size Effect ◽  
Terahertz Radiation ◽  
Room Temperature

scholarly journals Indentation creep of a Ti-based metallic glass

2009 ◽  
Vol 24 (3) ◽  
pp. 993-997 ◽  
Author(s):  
Y.J. Huang ◽  
Y.L. Chiu ◽  
J. Shen ◽  
J.J.J. Chen ◽  
J.F. Sun
Keyword(s):  
Metallic Glass ◽  
Size Effect ◽  
Stress Exponent ◽  
Deformation Behavior ◽  
Room Temperature ◽  
Bulk Sample ◽  
Indentation Creep ◽  
Indentation Size ◽  
Plastic Deformation Behavior ◽  
Measured Stress

In this work, the time-dependent plastic deformation behavior of Ti40Zr25Ni3Cu12Be20 bulk and ribbon metallic glass alloys was investigated using a nanoindentation technique at room temperature with the applied load ranging from 5 to 100 mN. The stress exponent n, defined as, has been derived as a measure of the creep resistance. It was found that the measured stress exponent increases rapidly with increasing indentation size, exhibiting a positive size effect. The size effect on the stress exponent n obtained from the bulk sample is more pronounced than that obtained from the ribbon sample. The deformation mechanism involved will be discussed.

Quantitative analysis of the size effect of room temperature nanoimprinted P3HT nanopillar arrays on the photovoltaic performance

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 11024-11032 ◽  
Author(s):  
Guangzhu Ding ◽  
Chao Li ◽  
Xiaohui Li ◽  
Yangjiang Wu ◽  
Jieping Liu ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Methyl Ester ◽  
Size Effect ◽  
Nanoimprint Lithography ◽  
Room Temperature ◽  
Photovoltaic Performance ◽  
Acid Methyl Ester ◽  
Acid Methyl ◽  
Butyric Acid Methyl Ester ◽  
Nanopillar Arrays

We develop a solvent-assisted room temperature nanoimprint lithography (SART-NIL) technique to fabricate an ideal active layer consisting of poly(3-hexylthiophene) nanopillar arrays surrounded by [6,6]-phenyl-C61-butyric acid methyl ester.

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