RESEARCH OF THE NANOMETER HELICOIDAL LAYUP OF RUFESCENS SHELL

2005 ◽  
Vol 19 (01n03) ◽  
pp. 577-579
Author(s):  
BIN CHEN ◽  
XIANG-HE PENG ◽  
JING-HONG FAN ◽  
WAN-LU WANG
Keyword(s):  
Fracture Toughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ceramic Composite ◽  
Organic Matrix ◽  
Nanometer Scale ◽  
Pullout Force ◽  
Sem Observation ◽  
Scanning Electron

A scanning electron microscope (SEM) observation on a Rufescens shell shows that the shell is a bio-ceramic composite consisting of aragonite sheets with nanometer scale and organic matrix. These nano-aragonite sheets are arranged in the shell in the form of helicoidal layup. The reason of the excellent fracture toughness of the shell is analyzed based on the maximal pullout force of the helicoidal layup of the aragonite sheets in the shell.

Helicoidal-Rounded-Hole Microstructure of Mature Shankbone

2011 ◽  
Vol 460-461 ◽  
pp. 652-655
Author(s):  
Bin Chen ◽  
Ji Luo ◽  
Quan Yuan
Keyword(s):  
Fracture Toughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Protein Matrix ◽  
Pullout Force ◽  
Sem Observation ◽  
Collagen Protein ◽  
Scanning Electron

Scanning electron microscope (SEM) observation on a mature shankbone shows that the bone is a kind of bioceramic composite consisting of hydroxyapatite sheets and collagen protein matrix. The observation also shows that there are many holes in the bone and that the hydroxyapatite sheets near by these holes helicoidally round these holes forming a kind of helicoidally-rounded-hole microstructure (HRHM). The maximum pullout force of the HRHM is investigated and compared with that of non-helicoidally-rounded-hole microstructure (NHRHM). It shows that the HRHM could markedly increase the maximum pullout force of the hydroxyapatite sheets compared to the NHRHM and therefore enhance the fracture toughness of the bone.

Lambdoidal Reinforced Microstructure of Mactridae Shell

2008 ◽  
Vol 368-372 ◽  
pp. 1695-1698
Author(s):  
Bin Chen ◽  
X. Peng ◽  
J. Fan ◽  
S. Sun
Keyword(s):  
Fracture Toughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Organic Matrix ◽  
Laminated Structure ◽  
Pullout Force ◽  
Scanning Electron

A scanning electron microscope (SEM) was used for observing the microstructures of a Mactridae shell. It showed that the shell is a kind of natural bioceramic composite, which consists of aragonite sheets and organic matrix with laminated structure. It also showed that there are various reinforced microstructures in the shell, which include a kind of lambdoidal one. The maximum pullout force of the lambdoidal reinforced microstructure, which is related to the fracture toughness of the shell, was analyzed and compared with that of a conventional 0°-structure based on their representative models. The result indicated that the maximum pullout force of the lambdoidal reinforced microstructure is markedly larger than that of the 0°-structure, which was experimentally verified.

Intercrossed Microstructures of Hydroxyapatite Sheets of Tibia Bone

2011 ◽  
Vol 460-461 ◽  
pp. 648-651
Author(s):  
Bin Chen ◽  
Quan Yuan ◽  
Ji Luo
Keyword(s):  
Fracture Toughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Protein Matrix ◽  
Pullout Force ◽  
Tibia Bone ◽  
Collagen Protein ◽  
Scanning Electron

The observation of scanning electron microscope (SEM) showed that a tibia bone is a kind of bioceramic composite consisting of hydroxyapatite layers and collagen protein matrix. All the hydroxyapatite layers are parallel with the surface of the bone and consist of numerous hydroxyapatite sheets. The observation also showed there is a kind of intercrossed microstructure of the hydroxyapatite sheets. In which the hydroxyapatite sheets in an arbitrary hydroxyapatite layer make a large intercrossed angle with the hydroxyapatite sheets in its adjacent hydroxyapatite layers. The maximum pullout force of the intercrossed microstructure, which is closely related to the fracture toughness of the bone, was investigated and compared with that of the parallel microstructure of the sheets through their representative models. Result indicated that the maximum pullout force of the intercrossed microstructure is markedly larger than that of the parallel microstructure.

Microstructure and Toughness Mechanism of Shank Bone

2009 ◽  
Vol 610-613 ◽  
pp. 1374-1377
Author(s):  
Bin Chen ◽  
Xiang He Peng ◽  
Shi Tao Sun ◽  
Ji Luo
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Organic Materials ◽  
Pullout Force ◽  
Sem Observation ◽  
Toughness Mechanism ◽  
Scanning Electron

Scanning electron microscope (SEM) observation was performed and showed that shank bone is a kind of bioceramic composite consisting of laminated hydroxyapatite and organic materials. The hydroxyapatite layers are parallel with the surface of the bone and consist of numerous thin and long hydroxyapatite sheet fibers. The hydroxyapatite sheet fibers in different hydroxyapatite make a little angle with each other and compose a kind of screwy microstructure. The maximum pullout force of the screwy microstructure was investigated and compared with that of parallel microstructure. It shows that the maximum pullout force of the screwy microstructure is markedly larger than that of the parallel microstructure, which was experimentally validated.

Investigation on Screwy Microstructure of Solid-Trough Shell

2008 ◽  
Vol 396-398 ◽  
pp. 453-456
Author(s):  
Bin Chen ◽  
Shi Tao Sun ◽  
Xiang He Peng ◽  
Jing Hong Fan
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Organic Materials ◽  
Pullout Force ◽  
Sem Observation ◽  
Scanning Electron

Scanning electron microscope (SEM) observation shows that Solid-trough shell is a kind of bioceramic composite consisting of laminated aragonite and organic materials. The aragonite layers are parallel with the surface of the shell and consist of numerous thin and long aragonite fibers. The aragonite fibers in an arbitrary aragonite layers possess different directions and compose a kind of screwy microstructure. The maximum pullout force of the screwy microstructure was investigated and compared with that of parallel microstructure based on their representative models. It shows that the maximum pullout force of the screwy microstructure is markedly larger than that of the parallel microstructure, which was experimentally validated.

Mechanism of High Modulus and Strength of Unio Douglasiae Shell

2011 ◽  
Vol 467-469 ◽  
pp. 571-574
Author(s):  
Bin Chen ◽  
Ji Luo ◽  
Quan Yuan ◽  
Jing Hong Fan
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fracture Strength ◽  
High Strength ◽  
High Density ◽  
Nanometer Scale ◽  
High Modulus ◽  
Sem Observation ◽  
Griffith Criterion ◽  
Scanning Electron

Scanning electron microscope (SEM) observation shows that the shell of a Unio douglasiae is a kind of bioceramic composite consisting of laminated aragonite and organic materials. The aragonite layers further consist of thin and long aragonite fibers. The aragonite fibers possess high density in the shell and their diameter is within nanometer scale. The mechanism of the high modulus and high strength of the shell were investigated based on the observed nanometer structure of the aragonite fibers and the rule of mixtures Young’s modulus as well as the Griffith criterion. It reveals that the high density and the nanometer scale of the aragonite fibers endow the shell with high modulus and fracture strength.

Hydroxyapatite-Sheet Microstructure of Shinbone

2008 ◽  
Vol 396-398 ◽  
pp. 441-444
Author(s):  
Bin Chen ◽  
Shi Tao Sun ◽  
Xiang He Peng
Keyword(s):  
Fracture Toughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Collagen Matrix ◽  
Sem Observation ◽  
Representative Model ◽  
Analytical Result ◽  
Parallel Distribution ◽  
Scanning Electron

Bone is a kind of biomaterial in nature. It behaves favorable strength, stiffness and fracture toughness which are closely related to its fine microstructures. Scanning electron microscope (SEM) observation on a shinbone shows that the bone is a kind of natural bioceramic composite consisting of hydroxyapatite layers and collagen matrix. The hydroxyapatite layers are arranged in a parallel distribution and consist of many hydroxyapatite sheets. The fracture toughness of the bone was analyzed based on the representative model of the microstructure in the bone and the idea of maximum pullout energy. The analytical result shows that the long and thin shape as well as the parallel distribution of the hydroxyapatite sheets increase the maximum pullout energy of the sheets and enhance the fracture toughness of the bone.

Fiber-Spiral Microstructures of Bamboo and Biomimetic Research

2010 ◽  
Vol 447-448 ◽  
pp. 657-660
Author(s):  
Bin Chen ◽  
Quan Yuan ◽  
Ji Luo
Keyword(s):  
Fracture Toughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Spiral Structure ◽  
Bamboo Fiber ◽  
Parallel Fiber ◽  
Fiber Structure ◽  
Fiber Reinforced ◽  
Sem Observation ◽  
Scanning Electron

The microstructures of a whangee (a kind of bamboo) were observed with a scanning electron microscope (SEM). It showed that the whangee is a kind of natural cellular biocomposite consisting of countless bamboo cells. The bamboo cells are columnar and all of them are parallel with the surface of the bamboo. The observation also showed that the walls of the bamboo cell are a kind of fiber-reinforced biocomposite with bamboo fiber-spiral mcirstructure. Based on the SEM observation, a kind of biomimetic composite with the fiber-spiral structure was fabricated. The fracture toughness of the composite was investigated and compared with that of the conventional composite with parallel-fiber structure. It showed that the fracture toughness of the biomimetic composite is markedly larger than that of the conventional composite.

Micro-nanometer scale vibration in imaging of metrological scanning electron microscope

2019 ◽  
Vol 27 (4) ◽  
pp. 860-867
Author(s):  
杜晨辉 DU Chen-hui ◽  
龚 亮 GONG Liang ◽  
蔡小勇 CAI Xiao-yong ◽  
殷伯华 YIN Bo-hua ◽  
江 潮 JIANG Chao ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Nanometer Scale ◽  
Scanning Electron
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