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  • 1
    Electronic Resource
    Electronic Resource
    Research on the Curving Aragonite Sheets in Clam’s Shell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 475-478 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Molluscan shell possesses excellent strength, stiffness and fracture toughness that areclosely related to its exquisite microstructure. SEM observation of a clam’ shell showed that theshell is a kind of bioceramic composite consisting of aragonite and protein layers parallel with thesurface of the shell. The observation also showed that the aragonite layers are composed of long andthin aragonite sheets. Many aragonite sheets are of curving shape at the center of the shell. Thehigher fracture toughness of the shell was analyzed based on the representative model of thecurving aragonite sheets and the concept of the maximum pullout force that is related to the fracturetoughness of the shell. The analytical result showed that the maximum pullout force of the curvingaragonite sheet is larger than that of straight aragonite sheets, which may effectively enhance thefracture toughness of the shell
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.475.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation to the Cross Microstructure of Hydroxyapatite Sheets of a Cannon Bone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 479-482 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bone possesses excellent mechanical properties, which are closely related to its favorablemicrostructures optimized by nature through many centuries. In this work, a scanning electronmicroscope (SEM) was used to observe the microstructures of a cannon bone. It showed that thebone is a kind of bioceramic composite consisting of hydroxyapatite layers and collagen proteinmatrix. The hydroxyapatite layers are composed of long and thin hydroxyapatite sheets. Thehydroxyapatite sheets in different hydroxyapatite layers distribute along different orientations,which composes a kind of cross microstructure. The maximum pullout force of the crossmicrostructure was investigated and compared with that of the 0° microstructure with theirrepresentative models. The result indicated that the maximum pullout force of the crossmicrostructure is markedly larger than that of the 0° microstructure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.479.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Round-Hole-Fiber Distribution in Hydrophilidae Cuticle and Biomimetic Research (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 433-436 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Insect cuticle possesses excellent mechanical properties, such as strength, stiffness and fracture toughness, which are closely related to its elaborate microstructures optimized through centuries’ evolution. SEM observation on Hydrophilidae cuticle shows a kind of biocomposite consisting of chitin-fiber plies and protein matrix, and the chitin-fiber plies are composed of several special arrangements. The observation also shows that there are many holes in the cuticle and the fibers passing along the brims of the holes round the holes continuously. Making use of such microstructure, a kind of biomimetic composite laminate with round-hole-fiber distribution is fabricated with preformed-hole method. The ultimate strength of the composite laminate is investigated and compared with that of the composite laminate with a hole drilled. It shows that the ultimate strength of the former is distinctly higher than that of the latter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.433.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Micro-Macro Combined Study for a Porous Constitutive Model Based on the Analysis of a Cylindrical Void (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 227 (Aug. 2002), p. 101-112 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/46/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.227.101.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Hydroxyapatite-Sheet Microstructure of Shinbone (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 396-398 (Oct. 2008), p. 441-444 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.396-398.441.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation on Screwy Microstructure of Solid-Trough Shell (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 396-398 (Oct. 2008), p. 453-456 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.396-398.453.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Research on the Hybrid Fiber-Reinforced Microstructure of Chafer Cuticle (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 111 (Apr. 2006), p. 135-138 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In this paper, the microstructure of chafer cuticle is observed with a scanning electron microscope (SEM). The observation shows that the insect cuticle is a kind of biocomposite with hybrid structural characteristic of various chitin fibers embedded in protein matrix. The reinforced chitin fibers vary in size, shape, property and distribution, which are related to their location in the cuticle. Near the surface of the cuticle, the chitin fibers are smaller, stiffer, more circular, andthe orientations of the chitin-fiber plies are various. A kind of helicoidal layup is found. The dependence of fracture strength on the fiber diameter and the dependence of fracture toughness on the parameters related to helicoidal layup are experimentally investigated. It shows that the smaller fiber and the helicoidal layup endow the surface of the cuticle with higher fracture strength and toughness
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.111.135.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    A Cyclic Stress-Strain Constitutive Model for Polycrystalline Magnesium Alloy and its Application (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 81-88 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The stress-strain behavior of cast magnesium alloy (AM60) was investigated bystrain-controlled cyclic testing carried out on MTS. In order to describe the cyclic stress and strainproperties of AM60 by means of the energy storing characteristics of microstructure duringirreversible deformation, a plastic constitutive model with no yielding surface was developed forsingle crystal by adopting a spring-dashpot mechanical system. Plastic dashpots reflecting thematerial transient response were introduced to describe the plasticity of slip systems. By utilizing theKBW self-consistent theory, a polycrystalline plastic constitutive model for Magnesium alloy wasformed. The numerical analysis in the corresponding algorithm is greatly simplified as no process ofsearching for the activation of the slip systems and slip directions is required. The cyclic stress-strainbehavior, based on this model, is discussed. The simulation results show good agreement with theexperimental data for AM60
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.81.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Research on the Layered Microstructure of Shankbone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 785-788 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bone is a kind of biomaterial in nature. It behaves favorable strength, stiffness andfracture toughness which are closely related to its fine microstructure. SEM observation on ashankbone shows that the bone is a kind of natural bioceramic composite consisted ofhydroxyapatite layers and collagen matrix. The observation also shows that the hydroxyapatitelayers consist of many hydroxyapatite sheets and are arranged in a parallel distribution. The fracturetoughness of the bone is analyzed based on the representative model of the microstructure of thebone and the idea of maximum pullout force. The analytical result shows that the long and thinshape as well as the parallel distribution of the hydroxyapatite sheets improves the maximumpullout force of the sheets and the fracture toughness of the bone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.785.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Research of Herringbone Structure of Fragum Unedo Shell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1273-1276 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The microstructure of a Fragum unedo shell is observed with a scanning electronicmicroscope (SEM). It shows that the shell is a kind of bio-ceramic composite consisting ofaragonite and collagen protein layers. The observation also shows that the aragonite layers consistof thin and long aragonite sheets. A kind of particular herringbone structure of the aragonite sheetsis found. In the structure, the aragonite sheets in an arbitrary aragonite layer make a crossed angleagainst that in its neighboring aragonite layers. Based on the SEM observation the comparativeexperiments in the maximum pull-out forces of both the herringbone and conventional 0°-structuresare conducted. It shows that the maximum pull-out force of the herringbone structure is markedlylarger than that of the 0°-structure, and the larger the crossed angle is, the more the maximumpull-out force of the herringbone structure will increase compared with that of the 0°-structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1273.pdf
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