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  • 1
    Electronic Resource
    Electronic Resource
    Sustained Loading Fracture and Strength of Concrete Modelled by Creep-Damage Interaction (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 51-54 
    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 phenomenon creep fracture is well-known for concrete. In the present paper, theMaterial Failure Process Analysis (MFPA2D) model for concrete in the failure process is coupled inseries with the time-dependence of the concrete damage and deformation. Further, the progressivecreep failure of concrete specimens under constant tensile loading was numerically simulated and thetypical time-dependent deformations: the transient creep, the steady-state creep and the acceleratingcreep were also represented. The numerical simulations indicate that the macroscopic creep failure isinduced by clusters of micro-fractures on a mesocopic scale. The above numerical results offer ussome theoretical indications and instructions to further investigate the instability failure mechanismsof engineering concrete structures in civil and hydraulic engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.51.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical Simulation and Analysis on Crack Path Deviation in Brittle Solid (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 931-934 
    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: Ductile tearing of brittle solid with initial crack is studied numerically. This work isfocused on the simulation and analysis of crack path deviation for the respective configuration and thestudy of relation between crack length and the fracture resistance, and that the configuration offracture surface is also observed. The simulating tool is a novel numerical code, 3D Realistic FailureProcess Analysis code (abbreviated as RFPA3D). The simulating investigation has shown that thefracture resistance decreases with the increase of the angle between the crack ends and horizontaldirection. Due to heterogeneity of materials distribution, crack path deviation towards the softer zoneor elements is observed. The topography of the non-planar fracture surface has plotted. Concludingthe simulation made in the present study, the problem of crack extension in the brittle solid can behandled by RFPA3D. Fracture resistance can be predicted and the crack path deviation be simulated,if the model parameters have been carefully identified and the mesh design is adequate. So this workis beneficial to choose safe load-spots and predicate the direction of the crack path deviation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.931.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Modelling of Thermal Cracking Behaviours of Fiber-Reinforced Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 237-240 
    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: In this paper, a coupled thermal-mechanical-damage model, Material Failure ProcessAnalysis for Thermo code (abbreviated as MFPA-thermo), was applied to investigate the formation,extension and coalescence of cracks in FRCs, caused by the thermal mismatch of the matrix and theparticles under uniform temperature variations. The effects of the thermal mismatch between thematrix and fibers on the stress distribution and crack development were also numerically studied. Theinfluences of the material heterogeneity, the failure patterns of FRCs at varied temperatures aresimulated and compared with the experimental results in the present paper. The results show that themechanisms of thermal damage and fracture of the composite remarkedably depend on the differencebetween the coefficients of thermal expansion of the fibers and the matrix on a meso-scale.Meanwhile, the simulations indicate that the thermal cracking of the FRCs at uniform variedtemperatures is an evolution process from diffused damage, nucleation, and finally linkage of cracks
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.237.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Modeling of Stress-Induced Permeability Evolution and Damage of Rock (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 609-616 
    Details
    ISSN: 1662-8985
    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: Rock permeability is important in civil and geo-hydraulic engineering, the mining andpetroleum industries, and in environmental and engineering geology. In this paper, considering themutual hydro-mechanical response between stress-induced permeability and damage, a coupledmathematical model for solid deformation and gas flow in the coal or rock was established and anattempt is made to investigate the rock permeability evolution, fracture patterns, and flow vectors inrock samples at the scale of usual laboratory samples as well as the relation between permeability andstress induced damage in connection with the complete strain-stress process of loaded rocks.Numerical simulations show that the permeability of rock was not constant, closely related to thestate of stress, but varied with the stress and strain states in the rocks. Microcracking, resulting fromthe concentration of stress on relatively weak rock elements, triggers successive crack initiation andpropagation that in turn leads to permeability enhancement. Prior to the peak strength, thepermeability decreases with increasing load. A dramatic increase in permeability occurs in thepost-peak stress-strain region due to the catastrophic collapse of microstructure in rock. Moreover,the permeability of rock in post-peak stress-strain region is much higher that that of in pre-peakregion. Such intensive studies of gas flow in stressed heterogeneous rocks are useful as initialapproaches to many engineering problems in mining and petroleum industries
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.609.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Non-Homogeneity on Limit Bearing Capacity of Rock Block (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 631-638 
    Details
    ISSN: 1662-8985
    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: Rock is a typical non-homogeneous material. The behavior of a rock block undercompression and the process of micro-fracture in that block are phenomena of considerable interest inunderstanding the strength characterization of brittle rock. In this study, the effect of thenon-homogeneity on limit bearing capacity of rock block based on Rock Elasto-Plastic FailureProcess Analysis code (REPFPA) are simulated and investigated. Numerical simulations find out thatthere exists a functional relation between the heterogeneity coefficient and the limit bearing capacityof rock block. For specimens with the same heterogeneity, however, the numerical simulations showthat the failure modes depend greatly on the crack initiation location, which is found to be sensitive tothe local disorder features within the specimen. In addition, the characteristics of acoustic emissionswith the changing of heterogeneity coefficient were also found. These identifications are crucial forbetter understanding and interpreting the experimental results and consequently, improve ourconcepts in design or analysis of rock engineering structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.631.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Study of Crack Propagation in Stiff Clays (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 201-204 
    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: Many stiff clays forming part of natural slopes and earth dams exist in the fissured state.When these cracks are subjected to gravity induced normal and shear stresses they may propagate.The present discussion presents a numerical method to study the propagation direction of cracksunder stress fields similar to those found in the field. Not only did the results on one crackpropagation direction obtained from the numerical method and the analytical results agree well, butnumerical results have been used to investigate the mechanisms of the whole process of twohorizontal cracks initiation and propagation and coalescence in stiff soils
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.201.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Thermal Induced Crack Propagation in Laminated Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 886-891 
    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: A coupled thermo-mechanical model is employed to analyze the thermo-mechanicalbehavior of a widely used laminated composite subject to temperature decrease at service conditions.Three sets of governing equations, i.e. heat transfer, thermo-mechanical deformation and damageevolution are respectively described in the model. These equations are then assembled into a coupledmatrix equation using finite element formulation and then solved simultaneously at each timeinterval. A numerical model of two layered composites with some preexisting equal-spacing cracksalong the interface in the lower layer is set up to investigate the thermal induced crack propagationdue to temperature decrease. Results are presented in the form of crack propagation process in stressprofiles and discussed. Numerical simulations show that the crack propagation behavior of thecomposites is closely dependent on the physico-mechanical properties of two layers and preexistingcracks. It is found that thermal induced cracks penetrate into the upper layer and grow in the upperlayer due to the low strength of the upper layer when the model is subject to uniform temperaturedecrease
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.886.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Application of RFPA〈sup〉2D〈/sup〉 in Sublevel Caving Mining Extra-Thick Coal Seams (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1246-1251 
    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: On the basis of suitable arrangement for the special stress surrounding and parametersselection, Realistic Failure Process Analysis 2-D (RFPA2D) numerical simulation of extra-thick coalseams’ displacement and failure is carried out. It’s proved that the numerical simulation results areconsistent with the in-sit measurement results of top coal’s advance supporting stress and deep-holedisplacement. So application of RFPA2D in sub-level caving mining extra-thick coal seams isreliable. It’s also proved that application of RFPA2D in sub-level caving mining can do great help tostudy the nature of top coal’s displacement, fragmentation and failure process of extra-thick coalseams. As the top coal’s displacement and failure situation under certain circumstance can beforecasted by RFPA2D numerical simulation, the most suitable top coal thickness under certaincircumstance can be predicted by RFPA2D numerical simulation test, which can do great benefit toextra-thick coal seams’ safe and high efficient mining
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1246.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Spark Plasma Sintering of Bismuth Titanate Ceramics (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Spark plasma sintering (SPS) was used to fabricate bismuth titanate (Bi4Ti3O12) ceramics. The densification, microstructure development and dielectric properties were investigated. It was found that the densification process was greatly enhanced during SPS. The sintering temperature was 200°C lower and the microstructure was much finer than that of the pressureless sintered ceramics, and dense compacts with a high density of over 99% were obtained at a wide temperature range of 800°–1100°C. Dielectric property measurement indicated that the volatilization of Bi3+ was greatly restrained during SPS, resulting in an unprecedented low dielectric loss for pure Bi4Ti3O12 ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00256.x
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  • 10
    Electronic Resource
    Electronic Resource
    Functional analysis of the ver gene using antisense transgenic wheat (1998)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 102 (1998), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The function of ver203, a gene related to vernalization in winter wheat, was investigated by expression of a complementary DNA as an antisense RNA in transgenic plants. A verc203:gus fusion-expression plasmid was constructed in pBI221, which contains a CaMV (cauliflower mosaic virus) 35S-promoter, a gus gene and a nos terminator. The construct was then introduced into the plant by the pollen-tube pathway. The results showed that heading was strongly inhibited in 6 of 326 vernalized antisense transgenic winter wheat plants, until both the vernalized control winter wheat and sense transgenic plants ripened. The hybridization analysis of DNA, amplification of the insert DNA sequences with PCR, northern blot analysis with double- and single-stranded probes, and detection of GUS activity by X-gluc assay gave strong positive results. This suggests that the VER203 protein plays an important role in controlling heading and flower development in winter wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.1998.1020112.x
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