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  • 1
    Electronic Resource
    Electronic Resource
    Das Nager-Syndrom (1998)
    Springer
    Mund-, Kiefer- und Gesichtschirurgie 2 (1998), S. 122-126 
    Details
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Nager-Syndrom ; Velumspalte ; Genetische Prädisposition ; Key words Nager syndrome ; Cleft velum ; Genetic predisposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: In this publication, Nager syndrome was analyzed in the literature and six patients from our clinic were evaluated in relation to symptoms, etiology and pathogenesis. The diseases to be considered when making a differential diagnostis are pointed out. Clarification of the etiology is still pending. Molecular genetic research in these patients is possibly the key for new findings. A case report illustrates the results of interdisciplinary treatment by the surgeon and orthodontist. Possibilities and problems in relation to therapy are demonstrated.
    Notes: Gegenstand der Arbeit waren eine Literaturanalyse zum Nager-Syndrom sowie eine Auswertung von 6 eigenen Patienten mit dieser angeborenen Fehlbildung zur Symptomatik, Ätiologie und Pathogenese. Die für die Differentialdiagnose in Betracht kommenden Erkrankungen wurden aufgeführt. Die Klärung der Ätiologie dieser angeborenen Fehlbildung steht noch aus. Molekulargenetische Untersuchungen bei entsprechenden Patienten sind möglicherweise der Schlüssel für zukünftige neue Erkenntnisse. Zum Erfolg interdisziplinärer kieferchirurgisch-kieferorthopädischer Maßnahmen wird anhand einer Kasuistik Stellung genommen. Möglichkeiten und Probleme der Therapie werden an diesem Beispiel aufgezeigt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100060050045
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  • 2
    Electronic Resource
    Electronic Resource
    Estimating damage laws from bend-test data (1985)
    Springer
    Journal of materials science 20 (1985), S. 935-940 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Bend-test curves were calculated for materials obeying three very different damage laws. One result of the calculations is that the neutral axis migrates towards the compression face as the load-point displacement increases. For the three damage laws investigated, there is a simple relationship between the location of the neutral axis and the secant modulus derived from the bend-test record; this relationship is quite insensitive to the exact form of the damage law. The stress at a point 20 per cent of the beam depth from the tensile outer fibre is also fairly insensitive to the form of the damage law. Combining these two observations, it is possible to use bend-test data to make a good estimate of the tensile stress-strain curve of a material subject to damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585737
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  • 3
    Electronic Resource
    Electronic Resource
    Indentation fracture of WC-Co cermets (1985)
    Springer
    Journal of materials science 20 (1985), S. 1873-1882 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Indentation fracture of a series of well-characterized WC-Co cermets was studied with a Vickers diamond pyramid indenter. The resulting crack length-indentation load data were analysed in terms of relations characteristic of radial (Palmqvist) and fully developed radial/median (half-penny) crack geometries. The radial crack model gave a better fit to the data on all the alloys studied. Crack shapes determined by repeated surface polishing confirmed the radial nature of the cracks. An indentation fracture mechanics analysis based on the assumption of a wedge-loaded crack is shown to be consistent with the observed linear relation between the radial crack length and the indentation load. The analysis also predicts a simple relation among the fracture toughness (K lc), the Palmqvist toughness (W) and the hardness (H) of the WC-Co alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555296
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  • 4
    Electronic Resource
    Electronic Resource
    Transformation yielding, plasticity and crack-growth-resistance (R-curve) behaviour of CeO2-TZP (1990)
    Springer
    Journal of materials science 25 (1990), S. 2025-2035 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Transformation yield and plasticity, transformation zone sizes at crack tips and rising crack-growth-resistance (R-curve) behaviours were studied in a commercial-grade ceria partially stabilized zirconia polycrystalline material (CeO2-TZP). The yield stresses measured in three-point bending decreased from 390 to 176 MPa when the sintering temperature was varied from 1425 to 1525° C. The corresponding total plastic strain to fracture increased with decreasing yield stress. Crack-tip transformation zones in precracked, annealed and loaded single-edge-notch-bend specimens decreased significantly in size with increasing transformation yield stress; however, the R-curves were relatively insensitive to the yield stresses or the transformation zone sizes. The measured zone sizes and R-curves were examined in terms of both crack shielding and plastic yield strip zone models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045759
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  • 5
    Electronic Resource
    Electronic Resource
    Solid particle erosion of SiC-Al2OC ceramics (1990)
    Springer
    Journal of materials science 25 (1990), S. 3229-3235 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Erosion rates of SiC-Al2OC ceramics, with Al2OC content varying from 5 to 75wt%, were assessed using 240-grit alumina abrasive particles accelerated to a velocity estimated at 120msec−1 and impacting the target at normal incidence. The target ceramics varied in hardness from 27.1 GPa for SiC-5wt% Al2OC to 10.8 GPa for SiC-75wt% Al2OC, but the fracture toughness was essentially independent of composition (K lc ã 3.5 MPa m1/2). The erosion weight loss varied linearly with the test duration for all the ceramics and the erosion rate decreased systematically with increasing target hardness; the hardness dependence of the erosion rate was, however, much greater than the predictions of the currently available erosion models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587679
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  • 6
    Electronic Resource
    Electronic Resource
    Stress-relaxation technique for deformation studies in four-point bend tests: application to polycrystalline ceramics at elevated temperatures (1979)
    Springer
    Journal of materials science 14 (1979), S. 2163-2171 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The advantages of the stress-relaxation technique can be effectively realized by applying the procedure to conventional four-point bend tests usually employed in the deformation studies of ceramic materials. A test system and procedure for determining plastic strain rate-stress relationships at elevated temperatures (up to 1600° C) by the stress-relaxation method is described. An analysis to calculate true plastic strains and stresses from measured deflections and loads is presented and it is shown that such an analysis requires minimum assumptions regarding the materials behaviour. Preliminary results obtained on an iron-doped MgO specimen are discussed and compared with the constant load test results obtained on identical specimens. Sources of error in the four-point bend stressrelaxation tests and the methods to minimize them are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688422
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  • 7
    Electronic Resource
    Electronic Resource
    Prediction of indentation-load dependence of fracture strengths from R-curves of toughened ceramics (1993)
    Springer
    Journal of materials science 28 (1993), S. 6120-6126 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Rising-crack-growth resistance or R-curves evaluated by direct measurements of crack lengths associated with indentation flaws in a sintered silicon nitride and a sintered and isostatically hot pressed (HIPed) SiC (whisker)-reinforced alumina were used to predict the corresponding indentation-load dependence of fracture strengths. Two empirical R-curve functions, a power law and an exponential function, were fitted to the R-curve data for the analysis. Fracture strengths were calculated by a combined numerical and graphical procedure that determined the point of tangency between crack-driving forces and the R-curves. The results revealed that the exponential function gave a better prediction of the measured log fracture-strength versus log indentation-load relation than the power law. The exponential function also predicted a nearly linear relation between log fracture-strength and log indentation-load, thus indicating that the apparent linearity of this plot is not adequate evidence to assume a power-law R-curve function. This study, therefore, reinforces the case for R-curve evaluations to be based on direct crack-length measurements rather than strength measurements, because the indentation-load dependence of the fracture strength is not sufficiently sensitive to discriminate between potential R-curve functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365032
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  • 8
    Electronic Resource
    Electronic Resource
    Application of the method of caustics to the centre-cracked diametral compression test specimen (1988)
    Springer
    Journal of materials science 23 (1988), S. 968-976 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Normalized Mode I stress intensity factors,N 1(a/R), for symmetrical radial cracks in diametral compression test specimens were experimentally evaluated using disc specimens of polymethyl methacrylate and the method of caustics. The method of caustics was first employed with precracked three-point bend specimens to assess the optical constant for the test material. This material property and the diameters of the caustics as a function of the applied load at different relative crack lengths (a/R) yielded the non-dimensional stress intensity factors using equations presented by Theocaris. These experimental values agreed closely with the theoretical solutions reported in the literature. Disc specimens of a polycrystalline alumina were also tested in diametral compression at temperatures up to 1000° C and the measured fracture toughness values were compared to those measured with chevron-notched bend specimens. It is shown that the centre-cracked diametral compression specimens give very reproducible fracture toughness measurements, and the specimen and the test technique can be usefully employed to assess the fracture toughness of structural ceramics at both ambient and elevated temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153996
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  • 9
    Electronic Resource
    Electronic Resource
    On estimating fracture toughness of cemented carbides from Palmqvist crack sizes (1986)
    Springer
    Journal of materials science 5 (1986), S. 365-368 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01748108
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