Distribution of hydroxyapatite crystallite orientation and ultrasonic wave velocity in ring-shaped cortical bone of bovine femur

2008 ◽  
Vol 55 (6) ◽  
pp. 1298-1303 ◽  
Author(s):  
Yu. Yamato ◽  
M. Matsukawa ◽  
H. Mizukawa ◽  
T. Yanagitani ◽  
K. Yamazaki ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Crystallite Orientation ◽  
Ultrasonic Wave Velocity

Three-Dimensional Anisotropy of Ultrasonic Wave Velocity in Bovine Cortical Bone: Effects of Hydroxyapatite Crystallites Orientation and Microstructure

2011 ◽  
Vol 50 (7S) ◽  
pp. 07HF18 ◽  
Author(s):  
Tomohiro Nakatsuji ◽  
Kazufumi Yamamoto ◽  
Daisuke Suga ◽  
Takahiko Yanagitani ◽  
Mami Matsukawa ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Three Dimensional ◽  
Ultrasonic Wave Velocity

Relative contributions of porosity and mineralized matrix properties to the bulk axial ultrasonic wave velocity in human cortical bone

Ultrasonics ◽  
2012 ◽  
Vol 52 (4) ◽  
pp. 467-471 ◽  
Author(s):  
Julien Grondin ◽  
Quentin Grimal ◽  
Kazufumi Yamamoto ◽  
Mami Matsukawa ◽  
Amena Saïed ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Ultrasonic Wave Velocity ◽  
Human Cortical Bone ◽  
Matrix Properties ◽  
Mineralized Matrix

Three-Dimensional Anisotropy of Ultrasonic Wave Velocity in Bovine Cortical Bone: Effects of Hydroxyapatite Crystallites Orientation and Microstructure

2011 ◽  
Vol 50 (7) ◽  
pp. 07HF18 ◽  
Author(s):  
Tomohiro Nakatsuji ◽  
Kazufumi Yamamoto ◽  
Daisuke Suga ◽  
Takahiko Yanagitani ◽  
Mami Matsukawa ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Three Dimensional ◽  
Ultrasonic Wave Velocity

The evolution of structure properties of vegetation concrete under freeze–thaw cycles

2020 ◽  
pp. 002072092093036
Author(s):  
Jiazhen Gao ◽  
Mingtao Zhou ◽  
Wennian Xu ◽  
Daxiang Liu ◽  
Jian Shen ◽  
...  
Keyword(s):  
Water Content ◽  
Ultrasonic Wave ◽  
Wave Velocity ◽  
Engineering Students ◽  
Cement Hydration ◽  
Electrical Engineering ◽  
Ultrasonic Wave Velocity ◽  
Freeze Thaw ◽  
Microstructural Parameters ◽  
Thaw Cycle

Vegetation concrete is a typical artificial composite soil commonly used for ecological restoration on slopes. The strength and stability of vegetation concrete would be reduced when it is used in areas where freeze–thaw cycles occur frequently. For exploring the changes of structural properties of vegetation concrete under freeze–thaw cycles, an indoor simulation experiment of vegetation concrete samples containing 25 and 30% water content was carried out, so as to test the changes of specimen surface, volume, ultrasonic wave velocity, shearing strength, and microscopic structure. The microstructural parameters were analyzed quantitatively with Image-Pro Plus software. The experimental results indicated that as cycles of freeze–thaw grow, the macroscopic changes of samples included steadily rising surface crack rate, increasing first and then decreasing volume, greatly reducing ultrasonic wave velocity and gradually decreasing shear strength. The inner structure of samples slowly deteriorated from overall dense to dispersed with decreasing cement hydration crystals, pores resulting from dispersion and destruction of bulky grains, higher surface porosity, and smoother particles in microscopic aspect. When compared with samples containing 25% water content, the microstructure of the 30% water content sample was more affected by the freeze–thaw cycle, and its structural weakening effect was more obvious. Reduced cement hydration crystals, lower inter-particle bonding force, and increase in the number of large pores were the main causes of degradation of vegetation concrete structure. Electrical engineering students can refer to the analysis methods in this paper to evaluate the structural performance of any electrical engineering material.

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