ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Anin situ investigation of the tensile failure of oxide scales (1994)
    Springer
    Oxidation of metals 42 (1994), S. 431-449 
    Details
    ISSN: 1573-4889
    Keywords: acoustic emission ; oxide failure ; mechanisms ; iron oxide ; nickel oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A small four-point-bend jig has been used in a scanning electron microscope (SEM) to monitor the tensile fracture processes in iron and nickel oxide scales in situ. The scales were 3–40 μm thick, the strain rate was 4×10−5 sec−1 and acoustic emission (AE) was used to correlate signals with specific cracking events. The technique provided detailed information of the failure processes, and several micrographs were taken as the crack pattern developed during testing. Failure started with short random through-scale cracks. These cracks soon formed a regular pattern. Spallation only occurred at much higher strains and resulted in very energetic AE signals. These signals were used together with the SEM observations to determine the strain to cause spallation. Measurements of the crack spacing as a function of strain showed that plastic stress relaxation by interfacial slip and/or substrate yielding processes affected cracking. Thus, the oxide remained attached to the substrate longer than would be expected from purely elastic behavior. An analysis based on the observed crack spacing at the onset of spallation gave ratios of 0.8–1.9 and ∼0.9 between tensile and interfacial strength for iron and nickel oxides scales, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046759
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The mechanical failure of oxide scales under tensile or compressive load (1993)
    Springer
    Journal of materials science 28 (1993), S. 6247-6260 
    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 Simple mechanical models which could be used to calculate the stresses in an oxide scale on a flat metal substrate are presented. The sources for these stresses and the experimental techniques for measuring stresses and oxide failure are also briefly summarized. The options for stress relief in oxide scales are listed. The importance of lateral oxide growth and oxide plasticity is emphasized. Both processes result in stress relief without scale failure. This is followed by a detailed survey of the proposed mechanisms and models for oxide scale failure under tensile or compressive forces. Experimental evidence in support of these mechanisms is examined and the critical factors for predicting oxide failure are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01352181
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Preparation and surface characterization of zincated aluminium memory-disc substrates (1993)
    Springer
    Journal of materials science 28 (1993), S. 1563-1572 
    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 surface compositions of CW66 aluminium alloy memory-disc substrates following commercial alkaline and acidic cleaning treatments and a commercial zincating treatment were investigated using the techniques of X-ray photoelectron spectroscopy, low-energy ionscattering spectroscopy, secondary ion mass spectrometry, and scanning electron microscopy. The commercial treatments were performed on the disc substrates following diamond turning, or diamond turning followed by alumina-slurry polishing. Results indicated that alumina-slurry polishing of CW66 memory-disc substrates produces a slightly thicker and more hydrated aluminium oxide film compared to diamond-turned only discs. Commercial alkaline (Alprep 204) and acidic (Alprep 230) cleaners do not significantly affect the aluminium oxide composition nor thickness on CW66 alloy. These cleaning treatments also do not appear to significantly affect the amount of surface carbon contamination, nor the amounts of trace surface contaminants, such as sulphur and chlorine, that are present on the metal. Nitric acid stripping treatments performed between the first and second zincating treatments do not completely remove all of the first zincate film. A small amount of zinc remains on the disc surface. After removal of the first zincate film with nitric acid, SEM results showed that the first zincate treatment significantly roughened the aluminium substrate compared to the cleaned discs. The zincate films prepared in this study were discontinuous and consisted primarily of a Zn(OH)2/ZnO mixture on the surface and zinc metal in the bulk of the film. A variety of trace contaminants (i.e. sodium, silicon, sulphur, chlorine, potassium, calcium and iron) were also present in the zincate films. Some of these contaminants (i.e., sodium, chlorine and iron) most likely resulted from minor components in the zincating solutions. The others most likely resulted from inadvertent sample handling or from the adsorption of airborne contaminants prior to the analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363350
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A comparison of energy release rates, the J-integral and crack tip displacements (1977)
    Springer
    International journal of fracture 13 (1977), S. 257-259 
    Details
    ISSN: 1573-2673
    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/BF00042571
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A photoelastic approach to fracture path prediction (1977)
    Springer
    International journal of fracture 13 (1977), S. 370-376 
    Details
    ISSN: 1573-2673
    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/BF00040153
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Prediction of slow crack growth by a finite element method (1975)
    Springer
    International journal of fracture 11 (1975), S. 1045-1046 
    Details
    ISSN: 1573-2673
    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/BF00033850
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Some further results on slow crack growth prediction by a finite element method (1976)
    Springer
    International journal of fracture 12 (1976), S. 503-506 
    Details
    ISSN: 1573-2673
    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/BF00032852
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Holographic analysis of the deformation of a diesel engine piston (1989)
    Springer
    Experimental mechanics 29 (1989), S. 455-459 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Holography has been used to measure the deformation of a diesel-engine piston heated through a low temperature rise in order to confirm the finite-element modeling of an isoformic piston being developed by Wellworthy Ltd. Previous work relating to the study indicated that a body movement had occurred on the piston and one of the main features of the current study was to measure the absolute movement at diametrically opposite positions on the piston. A single holographic plate was used for this purpose and produced the required results which, when averaged, compare favorably with finite-element results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02323867
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Holographic investigation of the expansion-control characteristics of steel inserts in pistons (1991)
    Springer
    Experimental mechanics 31 (1991), S. 319-327 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The expansion-control characteristics of steel inserts in the open-sleeve type of diesel-engine pistons were investigated using holographic interferometry. The holographic measurements were compared with the predictions of a finite-elements model of the piston. Due to the complex internal geometry of the piston and the in-built stresses, certain assumptions were made in the model. The measurements made for a rise from 50°C to 60°C showed the effects of these assumptions. At the 130°C to 140°C range, the steel insert was found to have lost control of the expansion of the aluminum-alloy skirt. This was confirmed by releasing the skirt from the sleeve in the model and repeating the analysis. The study has shown that the holographic technique can provide the true deformation behavior of the piston at different temperatures. The measurements can also be used to improve the accuracy of the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325988
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Comparison of measurement of piston deformation using holographic interferometry and finite elements (1993)
    Springer
    Experimental mechanics 33 (1993), S. 336-342 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Holographic interferometry was used to measure the thermal expansion of a diesel-engine piston and the results are compared with those predicted by a finite-element model. Various assumptions were made in the generation of the model and the holographic results provided a means of assessing the effects of these assumptions on the deformed profile of the piston. A holographic rig has been developed that enables one to measure simultaneously the deformation on the front and rear surfaces of the piston using a single holographic plate and hence detect any body displacement. A simple ‘mirror’ concept is introduced that can be used to measure in-plane and out-of-plane displacements simultaneously. The holographic results showed expansion values of ten-percent greater than the predictions of the model at midskirt level of the piston. A closer agreement of the results were observed at other levels of the skirt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02322150
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...