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  • 1
    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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Sheet-Layer Microstructure and Toughness Mechanism of Shinbone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 1129-1132 
    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: Most structural materials existing in nature take the form of composite. After centuries’evolution, these materials gain highly optimized microstructures and performances. In this work, akind of natural biomaterial, shinbone, is observed with a scanning electron microscope (SEM). Theobservation result shows that the bone is a bioceramic composite consisting of hydroxyapatitelayers and collagen matrix. The observation also shows that the hydroxyapatite layers are composedof hydroxyapatite sheets. The hydroxyapatite sheets are of thin and long shape and paralleldistribution along the orientation of the maximum main stress of the bone. The shape anddistribution of the hydroxyapatite sheets may endow the bone with favorable fracture toughness,which is analyzed and illuminated based a representational model of the hydroxyapatite sheets andthe idea of maximum pullout force
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.1129.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Observation on Hydrophilidae Cuticle and Analysis of Maximum Pullout Force of Branched Fiber (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 901-904 
    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: Most structural materials existing in nature take the form of composite. After centuries’evolution and modification, these natural materials gain highly optimized structures and prominentperformances. The SEM observation on the cuticle of Hydrophilidae shows that the cuticle is abiocomposite reinforced with chitin fibers. The chitin fibers are embedded in a protein matrix of thecuticle in the form of layers. A kind of revolving fiber layup was found. Observation also shows thatthere is a kind of special branched fiber consisting of a long fiber and many short fibers. Themaximum pullout force of the branched fiber is analyzed. The results show that the maximumpullout force of the branched fiber is distinctly larger than that of ordinary straight fiber
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.901.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Research of the Herringbone Microstructure of Rufescens’s Shell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 905-908 
    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 is strong, stiff, tough and shows an erose fracture surface when it isbroken. In this research, the SEM observation on a Rufescens’s shell shows that the shell consists ofaragonite layers and collagen matrix. Each aragonite layer is parallel to the surface of the shell andconsists of many thin aragonite sheets. These aragonite sheets are perpendicular to the layer wherethey are located. The observation also shows that the direction of the sheets in different layer isvarious and a kind of herringbone distribution is found. The maximum pullout force of theherringbone distribution is analyzed based on its representative model, and it shows that theherringbone distribution can markedly increase the pullout force of the distribution and improve thefracture toughness of the shell
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.905.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Lambdoidal Layup of Aragonite Sheets in Conch Shell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2532-2535 
    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 SEM observation on a conch’s shell shows that the shell is a kind of laminated bioceramiccomposite composed of aragonite layers and organic matrix. Each aragonite layer is parallel with thesurface of the shell and consists of many thin aragonite sheets. These aragonite sheets are perpendicular tothe layer where they are located. The observation also shows that the orientations of the sheets in differentlayers are different and these aragonite sheets compose various layups. A kind of lambdoidal layup isfound. The maximum pullout force of the lambdoidal layup is analyzed based on its representative model.The result shows that the lambdoidal layup can markedly increase the pullout force of the layup andimprove the fracture toughness of the shell
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2532.pdf
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  • 7
    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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  • 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
    Microscopically based new damage constitutive model with applications* (2000)
    Springer
    Journal of computer-aided materials design 7 (2000), S. 43-54 
    Details
    ISSN: 1573-4900
    Keywords: Constitutive equation ; Damaged materials ; Spherical void ; Void evolution rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper we put forward a new formulation of constitutive relations based on micro-mechanical analysis to describe the behavior of damaged materials. The constitutive theory of continuum damage mechanics has been further developed, based on the foundations of elastoplastic deformation and analysis of the mechanical behavior of a microelement of damaged material in which different damage mechanisms are involved. The description of ductile fracture phenomena by the evolution of damage parameter f, measuring the void volume fraction, is applied. Softening functions have been introduced into the macroscopic constitutive equations to model the damage effects on material response. The method has been applied to the analysis of the stress and damage distribution near the tip of the notch of the notched bar under uniaxial loading. Calculated results for distribution of stress and damage, based on the new constitutive description and corresponding finite element code, are compared with the experimental data obtained by deformation tests and photointerpreter. Calculated results show satisfactory agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008710108987
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  • 10
    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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