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  • 1
    Electronic Resource
    Electronic Resource
    Electromechanical properties of electrostrictive poly(vinylidene fluoride–trifluoroethylene) copolymer (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2054-2056 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a large electrostrictive strain in electron irradiated poly(vinylidene fluoride–trifluoroethylene) copolymer at a composition with 65 mol % vinylidene fluoride, which also exhibits a large ratio of strain to applied field (∼275 pm/V). The strain response is nearly independent of the external driving condition (unipolar or bipolar field) and does not change with temperature in about 20 °C temperature range near room temperature. Moreover, near room temperature, the material can reach a relatively high quasistatic longitudinal electromechanical coupling factor k33∼0.33. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122365
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrothermal growth of diamond in metal–C–H 2 O systems (1997)
    [s.l.] : Nature Publishing Group
    Nature 385 (1997), S. 513-515 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 Typical morphology of the product of the hydrothermal synthesis, a, Particle, several micrometres in size, b, Large aggregate, typically tens of micrometres in size but can be 〉100 |xm. Scale bars: a, 5 |mm; b, 10 |xm. Szmanski et a/.13 have claimed hydrothermal growth of diamond, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/385513a0
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical Analysis on Surface Fractures in Two-Layered Materials Subjected to Thermal Loading (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 913-916 
    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: With the knowledge of heterogeneous characteristics of thermal barrier coating materialsat mesoscopic level, a coupled thermo-mechanical-damage (TMD Model) model was introduced andused to numerically quantify the thermal stresses and crack development of in thermal barrier coatings(TBCs) composite subjected to decreased temperatures. The effect of different surface precrackmorphologies, such as precrack length and precrack density, on an interface crack subjected tothermal loading caused by a temperature change is presented. It provides us with a more sensiblephysical intuition and a more accurate mathematical for optimizing the design and the processing ofceramic coatings subjected to the coupled thermal-mechanical loading
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.913.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental Study on Crack Propagation by AE Location under Uniaxial Compression Condition (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2329-2332 
    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: AE technique is proved a efficient tool for real-time monitoring of the crack initiation andpropagation during rock failure process under uniaxial compression condition. In this paper, An AEsystem was employed to investigate the crack propagation and failure modes of three groups ofgranite specimens (80mm×100mm×170mm) with the same pre-existing crack. The AE sensors can besurface mounted. By using a Geiger location algorithm, AE event location can be determined bytime-of-arrival times. The propagation velocities of p-wave or s-wave of granite samples weremeasured. Experiments on pre-existing crack propagation of granite samples were carried out on thepress machine. From the testing result, failure mode of three kinds of granite samples was mainlyshear failure, while the secondary crack propagated slowly and could not influence the failure mode ofgranite sample. By surveying the relation of accumulative AE events and stress-strain curve, AEactivity represents different characters with stress-strain changing during the total loading process,microcracking contributing to fracture propagation with strain corrosion. AE location result reflectedcrack initiation and propagation, which is of great importance in studying rock instability andpredicting rock failure mode
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2329.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental Verification and Theoretical Analysis on Felicity Effect of Acoustic Emission in Concrete (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2333-2336 
    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 experiment of acoustic emission (AE) on concrete specimens under uniaxial cyclicloading was conducted. The Kaiser effect of acoustic emission in concrete and the Felicity effect,which manifest the memorizing ability to the maximum previous stress level of Kaiser effect, werevalidated by the experiment. The mechanism of Felicity effect was analyzed based on the theory ofstatistical damage mechanics and a tentative AE factor constitutive model of brittle material underuniaxial cyclic loading was suggested. The curve of constitutive model is in good coincidence withthe curve from the experiment. The experimental results showed that the Felicity effect becameclearer along with the increasing of stress level. Each loading cycle would cause new damage insidethe material, and the response of material to the new loading cycle is different from the previous cycle
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2333.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    An Experimental Study of Excavation Damaged Zone in Anisotropic Rock (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 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: When a tunnel or an underground structure is excavated in rock mass, rock disturbed ordamaged zone (EDZ) is formed around the excavation due to the stress concentration resulting fromstress redistribution. Recent studies on the rock EDZ revealed it’s important to structural stabilityaround underground opening. In this study, the fracture and damage mechanisms of rock induced bythe accumulation of microcracks were investigated by AE tests. The results of the experimentsshowed that tensile failure was the major microscopic failure mechanism of rock in excavationdamaged and disturbed zone. The expression of the damage magnitudes in each AE source leads toaccurate prediction of macroscopic failure mechanisms. In addition, the orientation of themacroscopic failure plane could be estimated by the orientational distribution of microcracks
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.905.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrahigh field induced strain and polarization response in electron irradiated poly(vinylidene fluoride-trifluoroethylene) copolymer (1998)
    Springer
    Materials research innovations 2 (1998), S. 57-63 
    Details
    ISSN: 1433-075X
    Keywords: Key words Polymers ; PVDF-TrFE ; Electron irradiation ; Dielectric constant ; Vogel-Fulcher law ; Strain ; Polarization ; Electrostriction ; Elastic modulus ; Elastic energy density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The influence of electron dosage on the field induced strain, dielectric constant, and polarization response has been investigated in electron irradiated poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) 50/50 copolymer. It was found that under suitable electron dosage an ultrahigh electrostrictive strain can be achieved. Interestingly, material after irradiation exhibits many features resembling those of relaxor ferroelectrics, suggesting that the electron irradiation breaks up the coherent polarization domain in normal ferroelectric P(VDF-TrFE) copolymer into nano-polar regions that transform the material into a relaxor ferroelectric. In addition, many of the material properties including the field induced polarization, the electrostrictive strain, and elastic modulus exhibit irregular change (non-monotonical) with electron dosage, indicating a complex relation among the crosslinking density, crystallinity, crystallite size, and molecular conformation in determining the material responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100190050063
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  • 8
    Electronic Resource
    Electronic Resource
    Sintering of β-Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Powder Prepared by Self-Propagating High-Temperature Synthesis (SHS) (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2179-2182 
    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: Sintering of the Self-Propagating High-Temperature Synthesis (SHS) of β-Si3N4 powderwith 6.67 wt.% Y2O3 and 3.33 wt.% Al2O3 as sintering additives has been emphatically investigatedusing hot-press sintering process. The relative density of hot-pressed β-Si3N4 reached near to thefull densification (99.43%) at 1700℃. The similar micrographs with self-reinforcing rod-likeβ-Si3N4 grains forming an interlocking structure were observed. The better mechanical properties ofhot-pressed Si3N4, such as the hardness (16.73GPa), fracture toughness (5.72 MPa·m1/2) andbending strength (611.72MPa) values, were obtained at 1700℃. The results indicate that goodsinter ability can be obtained with the cheaply SHS of silicon nitride powder for preparing siliconnitride materials, which will make the cost of silicon nitride materials lowered
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2179.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fabrication of Ba〈sub〉6-3x〈/sub〉(Sm〈sub〉0.2〈/sub〉Nd〈sub〉0.8〈/sub〉)〈sub〉8+2x〈/sub〉Ti〈sub〉18〈/sub〉O〈sub〉54〈/sub〉(x=2/3) Ceramics by Solid State Reaction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 258-261 
    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: Effects of calcining and sintering temperatures on the microstructure and the microwavedielectric properties of Ba6-3x(Sm0.2Nd0.8)8+2xTi18O54(x=2/3) ceramics were studied. When the calciningtemperature was lower (1373K), the dielectric constant ε and the Qf factor initially increased withincreasing sintering temperature, but decreased when sintering temperature was higher than 1603K. As awhole, the temperature coefficients of the resonant frequency τf tended to increase with increasingsintering temperature. The microstructure of the sintered ceramic consisted mainly of columnar andblock-shape grains. The grain size increased with increasing sintering temperature. When the calciningtemperature was higher (1473K), εr and τf were nearly independent of sintering temperature. Theexcellent microwave dielectric properties were achieved in the Ba6-3x(Sm0.2Nd0.8)8+2xTi18O54 (x=2/3)ceramic calcined at 1373K and sintered at 1603K for 3 h: ε = 80.8, Qf = 8114 (GHz) and τf = 5.6
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.258.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Failure Process of Rock Sample Observed by AE Source Locating Technique under Uniaxial Compression (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 567-570 
    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: A series of uniaxial-compression tests were conducted on some representative brittle rockspecimens, such as granite, marble and dolerite. A multi-channel, high-speed AE signal acquiringand analyzing system was employed to acquire and record the characteristics of AE events anddemonstrate the temporal and spatial distribution of these events during the rupture-brewingprocess. The test result showed that in the primary stage, many low amplitude AE events weredeveloped rapidly and distributed randomly throughout the entire specimens. In the second stage,the number of AE increased much slower than that in the first stage, while the amplitude of mostAE events became greater. Contrarily to the primary stage, AE events clustered in the middle areaof the specimen and distributed vertically conformed to the orientation of compression. The mostdistinct characteristic of this stage was a vacant gap formed approximately in the central part of thespecimen. In the last stage, the number of AE events increased sharply and their magnitudeincreased accordingly. The final failure location coincidently inhabited the aforementioned gap. Themain conclusion is that most macrocracks are developed from the surrounding microcracks existedearlier and their positions occupy the earlier formed gaps, and the AE activity usually becomesquite acute before the main rupture occurs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.567.pdf
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