Library

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
Filter
  • 2005-2009  (6)
  • 1970-1974  (1)
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Stress Relief Groove Shape on Fretting Fatigue Strength (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 856-859 
    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 objective of this study is to evaluate the effect of stress relief groove on frettingfatigue strength. Fretting fatigue tests and finite element analyses were done. The shape of groovewas controlled by groove radius R and tangential angle θ. The depth of groove was specified by Rand θ. Fretting fatigue strength was increased with an increase of θ and then it turned into adecrease. The decrease was caused by the transition of failure mode from fretting fatigue at thecontact part to plain fatigue at the groove root. The transition was caused by an increase of stressconcentration at the groove root with an increase of the groove depth. Therefore, the maximumimprovement of fatigue strength was achieved by the largest θ limited by fatigue strength of thegroove root. In the analysis, the groove generates high compressive stress field at the contact edge,where small cracks never propagate. Therefore, assumptions to relieve the contact pressureconcentration at the contact edge were taken into the analysis model. The values of stress intensityfactor ranges for small cracks introduced near the contact edge were almost the same betweengrooved and non-groove specimens
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.856.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Assessment of Extrinsic Crack Tip Shielding in Austenitic Steel near Fatigue Threshold (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 49-52 
    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: Asymmetric arrangements of stored crack-wake dislocations and low values of the sizeratio SR, the plastic zone size / the characteristic microstructural distance, were found to be of basicimportance for the shear misfit of crack flanks causing the roughness-induced crack closure in caseof plain strain conditions. The crack wake dislocations produce also the plasticity induced crackclosure as a result of a near-tip mismatch perpendicular to crack flanks. According to a recentlypublished theoretical concept, an estimation of these extrinsic shielding effects in the threshold regionof fatigue crack propagation was made for austenitic steel of Japan provenience. Related fatigueexperiments were based on a standard load shedding technique associated with monitoring ofthe crack closure level. The surface roughness was analysed by means of the optical chromatographythat enables a 3D reconstruction of fracture morphology. Calculated and measured effectivethreshold values of about 2.2 MPa.m1/2 are practically identical. Total levels of the extrinsic tougheninginduced by the austenitic microstructure are rather low when compared to those identified inferritic- and ferritic-austenitic steels
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.49.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fatigue Property of High-Strength Carbon Steel Deformed by Repetitive Side Extrusion Process (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 245-248 
    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: The development of an ultrafine grained carbon steel during repetitive shear deformation of side extrusion and the properties after heat treatment were investigated. Side extrusions were carried out at room temperature and the used material was 0.50% carbon steel. The repetitive side extrusions with a constant lateral pressure were carried out up to 3 passes without rotation. The specimens of these steels after 3 passes were annealed at a constant temperature of 600ºC changing the treatment time. After side extrusion and heat treatment, the fatigue property was better than that of the as-received material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.245.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Fatigue Failure under Varying Loading within Fatigue Limit Diagram (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 1-8 
    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: Although fatigue limit diagram is defined in principle for constant stress amplitudecondition, it is often considered that fatigue failure would not occur even in varying loading if appliedstresses were kept within the fatigue limit diagram. However, it was shown in the case ofsmall-notched specimen and fretting fatigue that fatigue failure occurred in some special case ofvariable amplitude loading condition even when all stress amplitudes were kept within the fatiguelimit diagram. The cause of this phenomenon was examined using two-step and repeated two-stepstress patterns in which the first step stress was with zero mean stress and the second step stress had ahigh mean stress. A non-propagating crack was formed by the first step stress. This crack functionedas a pre-crack for the second step stress with high mean stress. Consequently, fatigue failure occurredeven when all stress amplitudes were kept within the fatigue limit diagram. It was an unexpectedfracture caused by the interference effect of non-propagating crack and mean stress change
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.1.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Effect of Absorbed Hydrogen on the Near Threshold Fatigue Crack Growth Behavior of Short Crack (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 409-412 
    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: Hydrogen is considered to be a possible energy source in the coming future. However, ithas been recognized that hydrogen has a detrimental effect on the fatigue strength of metal. Thefatigue crack growth characteristic is an important property for the integrity assessment of hydrogenutilization machine. In this report, the effect of hydrogen on the fatigue crack propagationcharacteristic was studied using low alloy steel, carbon steels and A286 alloy. Especially in this study,very short pre-cracked specimen as small as 0.03 mm deep was used and the near threshold fatiguecrack behavior was studied. As a result, materials whose Vickers hardness was higher than 300 werefound to be susceptible to absorbed hydrogen
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.409.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Cause and Effect of Factors Affecting the ΔK〈sub〉th〈/sub〉 of Small Crack (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 482 (Apr. 2005), p. 89-94 
    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: The threshold stress intensity factor (ΔKth) of small crack is affected by various factors, especially by material hardness, stress ratio and crack size. Test results showed that harder material had higher ΔKth and smaller crack had lower ΔKth. The crack closure measurement on a very small crack was done to make clear the root cause of those effects. Most of those effects could be explained by the peculiar behavior of crack closure for crack deeper than 100µm. However, everything could not be understood only by the crack closure behaviour. In addition to the difference in crack closure, (ΔKeff)th itself was also dependent on crack size when the crack depth was shallower than 100µm. Another remarkable phenomenon was experienced in this study. Unusual decrease in ΔKth was found in some case. The large decrease of ΔKth occurred under the conjunction of three factors, that is,extremely high stress ratio (R) higher than 0.8, small crack and hard material. This kind of large reduction in ΔKth in high R region is of much importance in turbo machinery that operates under high mean stress with small vibratory stress
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.482.89.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Syntheses of poly[γ-(l)-menthyl L- and D-glutamates] and their secondary structuresPresented at the Annual Meeting of the Chemical Society of Japan, Tokyo, Japan, March 1969. (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 41-52 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: γ-(l)-Menthyl L- and D-glutamates were prepared by a fusion reaction of N-phthalyl-L- and D-glutamic anhydrides with l-menthol, followed by hydrazinolysis. The monomers were polymerized to poly[γ-(l)-menthyl L- and D-glutamates] by the N-carboxyanhydride method. These polymers were soluble in many organic solvents, such as ethyl ether, chloroform, tetrahydrofuran, and n-hexane. From the results obtained by a study of the infrared absorption spectra, the x-ray photographs, the optical rotatory dispersions and the circular dichroisms, poly[γ-(l)-menthyl L-glutamate] was found to be a right-handed α-helix in the solid state and in solution. Similarly, poly[γ-(l)-menthyl D-glutamate] was a left-handed α-helix. The helix-coil transition of these polymers was observed in the vicinity of 40% dichloroacetic acid in a chloroform-dichloroacetic acid mixture.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090105
    Library Location Call Number Volume/Issue/Year 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...