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  • Articles  (11)
  • Articles: DFG German National Licenses  (11)
  • Open Access-Papers
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (11)
  • 1
    Electronic Resource
    Electronic Resource
    An improved formulation of the oxygen-diffusion problem and its application to Zircaloy oxidation by steam (1997)
    Springer
    Oxidation of metals 47 (1997), S. 427-444 
    Details
    ISSN: 1573-4889
    Keywords: modeling ; numerical techniques ; finite-difference methods ; diffusion ; moving boundary problem ; steam oxidation ; Zircaloy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Numerical solutions of the oxygen-diffusion problem arising in the oxidation of metals at high temperatures are complicated by the change in density as the oxide is formed and the occurrence of moving boundaries separating the different phases. The former complication is resolved by a transformation of the dependent variable and the coordinate, which reduces the problem to a form identical to one without density change. The latter complication is dealt with by demonstrating an analogy with the Stefan problem in heat transfer with phase change in the enthalpy formulation, for which abundant numerical works exist. A finite-difference code is written to solve the resulting equations. It is successfully applied to simulate an oxidation experiment of Zircaloy by steam at 1600°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02134785
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  • 2
    Electronic Resource
    Electronic Resource
    Fatigue crack growth rates under sequential mixed-mode I and II loading cycles (2000)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 23 (2000), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: One common mode of failure that occurs in rolling bodies such as gears, bearings and rails is due to the fatigue process. Several research workers suggest that rolling contact fatigue cracks are subjected to mixed mode I and II loading cycles. It is believed that the correct modelling of loading cycles can help us to study the mechanics of crack growth because fatigue comprises a major safety consideration in the design process. Experiments have been performed under nonproportional mixed-mode I and II loading cycles with fixed degrees of overlap, so that coplanar cracks were produced. Three empirical crack propagation laws have been established which are related to both mode I and mode II effective stress intensity factor ranges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2000.00342.x
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  • 3
    Electronic Resource
    Electronic Resource
    Two measurement techniques for determining effective stress intensity factors (2000)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 23 (2000), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two methods were studied for determining crack closure and locking effects under combinations of mixed mode I and II loading, namely the strain gauge and the surface replica methods. They demonstrated that strain gauges are able to detect the mode I crack closure but not mode II crack locking. As an alternative, the surface replica method is suggested as a practical technique for measuring mode II crack locking effects. The effective mode II stress intensity factor range can be estimated by comparison of the actual measured sliding range between a pair of crack faces and the theoretical sliding range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2000.00341.x
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  • 4
    Electronic Resource
    Electronic Resource
    A graph-based expert system approach to geometric feature recognition (1995)
    Springer
    Journal of intelligent manufacturing 6 (1995), S. 155-162 
    Details
    ISSN: 1572-8145
    Keywords: Feature recognition ; adjacency graphs ; expert systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Geometric feature recognition is a crucial task in the development of concurrent engineering software. This paper presents a new methodology for geometric feature recognition which combines the advantages of face-edge adjacency graphs and expert systems. The methodology uses several new concepts such as enhanced winged edge data structure (EWEDS) and multi-attributed adjacency graphs (MAAG). The object model is presented as a set of facts. The rules for the recognition of each feature are derived from the corresponding feature-MAAG. This simplifies the process of writing the rules while enabling the inclusion of new features into the rule base as they are encountered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171444
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  • 5
    Electronic Resource
    Electronic Resource
    Deep-level photoluminescence studies of undoped and tin-doped (LEC) InP (1994)
    Springer
    Journal of materials science 5 (1994), S. 215-220 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of tin doping on the deep-level photoluminescence (PL) spectra of (LEC) InP were studied. Specifically, the effect of rapid thermal annealing (RTA) on the deep emission bands labelled as band A (1.13 eV), band B (1.06 eV), band C (1.20 eV) and band D (0.97 eV) were investigated. Band A appeared in both undoped and doped samples, but it disappeared after RTA for all the samples. It is suggested that band A is due to the formation of a complex involving VIn with residual impurities. The disappearance of band A after RTA is concomitant with the appearance of bands B, C and D. The existence of band B is attributed to the complex formation of VP with residual impurities. Band C was observed after the annealing process both in undoped and lightly-tin-doped samples and is believed to be due to the formation of VP single point defects. Band D was only observed in heavily doped samples and it is believed to be the effect of InP antisite defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186188
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  • 6
    Electronic Resource
    Electronic Resource
    Mixing of phosphorus and antimony ions in silicon by recoil implantation (1986)
    Springer
    Journal of materials science 5 (1986), S. 633-634 
    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/BF01731532
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  • 7
    Electronic Resource
    Electronic Resource
    P-n junctions and Schottky barriers formed by antimony recoil implantation (1986)
    Springer
    Journal of materials science 5 (1986), S. 789-791 
    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/BF01730093
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  • 8
    Electronic Resource
    Electronic Resource
    Shallow Sb-doped Si surface layers formed by recoil implantation (1989)
    Springer
    Journal of materials science 24 (1989), S. 1073-1076 
    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 Recoil implantation was used to form shallow n+ layers on p-Si by implanting 150 keV Ar+ ions through evaporated Sb layers. By varying the Sb layer thickness, different dopant profiles were achieved. Based on the sheet resistance measurements, it was found that the dopant profiles deviated from theory when the Sb layer thickness was small. Damage effects related to energy deposition by the primary ions were used to explain the differences. It was suggested that these effects could significantly affect the dopant activity and the redistribution of the atoms during heat treatment. These effects were less important for those samples with thick Sb layers. For shallow p-n junction formation, it was essential to keep the damage effects to a low level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01148801
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  • 9
    Electronic Resource
    Electronic Resource
    Fracture resistance of polyblends and polyblend matrix composites: Part I Unreinforced and fibre-reinforced nylon 6,6/ABS polyblends (1997)
    Springer
    Journal of materials science 32 (1997), S. 5335-5346 
    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 deformation behaviour and the fracture resistance of a range of nylon 6,6/ABS alloys of varying composition both with and without the presence of glass fibres were investigated. The deformation behaviour was characterized by careful measurements of the volumetric strain during tensile tests in order to understand the relative roles of cavitation and shear yielding in these materials. The fracture resistance was investigated in detail in the fracture mechanics sense by characterizing the J-integral fracture initiation toughness. In materials exhibiting stable crack growth, a new parameter, namely, the plateau value of the J-integral fracture resistance curve, was measured directly and represented the resistance of the material to stable crack growth. The results showed that the relationship between the deformation behaviour and fracture resistance was related to the extent of damage that developed in the crack-tip zone. Substantial additional toughening was developed during the crack extension stage both in the presence and absence of glass fibres. Glass fibres were found to promote shear yielding and, as a result, enhance both the fracture initiation as well as the fracture propagation resistance of the nylon 6,6/ABS alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018618912039
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  • 10
    Electronic Resource
    Electronic Resource
    Intensity dependence of the deep levels of semi-insulating GaAs on the annealing temperature (1992)
    Springer
    Journal of materials science 11 (1992), S. 196-198 
    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/BF00741419
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