scholarly journals Distribution of longitudinal wave velocity and hydroxyapatite crystallite orientation in bovine cortical bone

2009 ◽  
Vol 30 (4) ◽  
pp. 306-309 ◽  
Author(s):  
Yuichiro Yaoi ◽  
Kazufumi Yamamoto ◽  
Yu Yamato ◽  
Takahiko Yanagitani ◽  
Mami Matsukawa ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Longitudinal Wave Velocity ◽  
Crystallite Orientation

Relationships between the anisotropy of longitudinal wave velocity and hydroxyapatite crystallite orientation in bovine cortical bone

Ultrasonics ◽  
2012 ◽  
Vol 52 (3) ◽  
pp. 377-386 ◽  
Author(s):  
Kazufumi Yamamoto ◽  
Tomohiro Nakatsuji ◽  
Yuichiro Yaoi ◽  
Yu Yamato ◽  
Takahiko Yanagitani ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Longitudinal Wave Velocity ◽  
Crystallite Orientation

Anisotropy of Longitudinal Wave Velocity and Hydroxyapatite Orientation in Bovine Cortical Bone

2009 ◽  
Vol 48 (7) ◽  
pp. 07GK06 ◽  
Author(s):  
Yuichiro Yaoi ◽  
Kazufumi Yamamoto ◽  
Tomohiro Nakatsuji ◽  
Takahiko Yanagitani ◽  
Mami Matsukawa ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Longitudinal Wave Velocity

Determining the Thermal Shock Elastic Behavior of Mullite Ceramic Regenerator Material by Ultrasonic Testing

2014 ◽  
Vol 633 ◽  
pp. 472-475 ◽  
Author(s):  
Tian Tian Sun ◽  
Yan Xia Wang ◽  
Hai Yun ◽  
Dong Huan Zhang ◽  
Qing Hui Shang
Keyword(s):  
Thermal Shock ◽  
Longitudinal Wave ◽  
Shear Wave ◽  
Wave Velocity ◽  
Temperature Difference ◽  
Shear Wave Velocity ◽  
Modulus Of Elasticity ◽  
Longitudinal Wave Velocity ◽  
Mullite Ceramic ◽  
Mullite Ceramics

Mullite material is a material commonly used in honeycomb regenerator, because in the process of using material under big temperature difference effect, so have a great demand for its thermal shock resistance. The used mullite ceramics were made by the direct solid phase sintering method, and the modulus of elasticity of the mullite ceramics measured by ultrasonic pulse-echo method in a thermal shock and thermal fatigue experiment, respectively. In the air-cooling condition, the study found the mullite ceramic without thermal shock that the longitudinal wave velocity and shear wave velocity respectively 3970(m/s) and 2492(m/s). After 45 times thermal shock of temperature difference of 800°C, longitudinal wave velocity and shear wave velocity decreased to 3910(m/s) and 2457(m/s), and the value of the modulus of elasticity changed 1020MPa. By observing the change of the elastic modulus value rule, can know the elastic deformation of thermal shock on the material performance of thermal shock damage. Moreover, the results can provide the data basis for the calculation of the residual strength and the numerical simulation of thermal stress.

Ultrasonic Study on Crystal Orientation Effects Upon Point Defect Growth Caused by Cross Slip Under Plastic Deformation

2004 ◽  
Author(s):  
Michiaki Kobayashi
Keyword(s):  
Plastic Deformation ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Crystal Orientation ◽  
Pure Shear ◽  
Cross Slip ◽  
Polished Surface ◽  
Longitudinal Wave Velocity ◽  
Velocity Change ◽  
Change Tendency

Concerned with the longitudinal wave velocity changes under plastic deformation in pure shear state, the experimental results of longitudinal wave velocity are categorized to two types: (i) simple decreasing change tendency at polished surface specimens, and (ii) chaotic change tendency at unpolished surface specimens. In the present paper, the effects of surface roughness and crystal orientation on the amount of cross slip under plastic deformation are studied via finite element polycrystal model (FEPM) from the viewpoint of longitudinal wave velocity change showing a sensitive response to the point defects caused by cross slip.

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