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
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Residual Stress on High Temperature Deformation in a Weld Stainless Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 311-316 
    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: This paper considers the measurement of residual stresses induced by mechanical loading in a weldType 347 stainless steel. The work is based in part on an ongoing Round Robin collaborative effortby the Versailles Agreement on Materials and Standards, Technical Working Area 31, (VAMASTWA 31) working on ‘Crack Growth of Components Containing Residual Stresses’. The specificobjective of the work at Imperial College London and HMI, Berlin is to examine how residualstresses and prior straining and subsequent relaxation at high temperature contribute to creep crackinitiation and growth for steels relevant to power plant applications. Tensile residual stresses havebeen introduced in the weld by pre-compression and neutron diffraction measurements have beencarried out before and after stress relaxation at 650 oC. Significant relaxation of the residual stresseshas been observed, in agreement with earlier work on a stainless steel. Preliminary results suggestthat the strains local to the crack drop by over 60% after 1000 h relaxation at 650 oC for the weldsteel. The results have been compared with finite element studies of elastic-plastic pre-compressionand stress relaxation due to creep
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.311.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
    Residual Stress Analyses by Neutron Diffraction in Irradiated Double-V Butt Welded Steel Plates (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 381-386 
    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: Neutron irradiation is known to have a considerable impact on the mechanicalcharacteristics and the behaviour of materials and components. The distribution of residual stressesis one of the properties affected by irradiation. However, because of the difficulties in performingmeasurements in radioactive components, not many experimental data have to date been collected.At the High Flux Reactor (HFR) of the European Commission’s Joint Research Centre (JRC), afacility has been developed for residual stress measurements in steel specimens subjected to longtermirradiation. The objective of this development was to establish the neutron radiation inducedchanges in the residual stresses around welds in test pieces representative of the core shroud ofboiling water reactors. Residual Stress measurements on such double-V butt welds in stainless steelplates after irradiation exposure have been performed by neutron diffraction using this facility. Thecomparison with measurements in non-irradiated companion specimens [1] showed that irradiationchanged the distribution of residual stresses. The results suggested that the impact of irradiationvaried with the distance of the test location from the specimen surface. On the basis of currentlymeasured data we could not draw definitive conclusion about the influence of neutron dose andirradiation duration upon the stress modification
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.381.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
    The New Materials Science Diffractometer STRESS-SPEC at FRM-II (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 211-216 
    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: In response to the development of new materials and the application of materials andcomponents in new technologies the direct measurement, calculation and evaluation of textures andresidual stresses has gained worldwide significance in recent years. Non-destructive analysis forphase specific residual stresses and textures is only possible by means of diffraction methods. Inorder to cater for the development of these analytical techniques the new Materials ScienceDiffractometer STRESS-SPEC at FRM-II is designed to be equally applied to texture and residualstress analyses by virtue of its flexible configuration. The system compromises a highly flexiblemonochromator setup using three different monochromators: Ge (511), bent silicon (400) andpyrolitic graphite (PG). This range of monochromators and the possibility to vary the take-off anglesfrom 2θM = 35º to 110º allows wavelength adjustment such that measurements can be performedaround a scattering angle of 2θS ~ 90º. This is important in order to optimise neutron flux andresolution, especially for stress analysis on components, since the gauge volume element in that caseis cubic and large vertical divergences due to focusing monochromators do not affect the spatialresolution.The instrument is now available for routine operation and here we will present details of recentexperiments and instrument performance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.211.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
    The New and Upgraded Neutron Instruments for Materials Science at HMI - Current Activities in Cooperation with Industry (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 223-228 
    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: Recent progress in engineering includes the development of new materials andinnovations in their processing and treatments. Material technologies, like the study of metals,alloys, ceramics and composites, especially non-destructive analyses of residual stresses profiles andtextures, have gained an increasing importance.The dedicated residual stress diffractometers E3 and E7 at BENSC, HMI, Berlin are alreadyequipped with new two-dimensional position sensitive detectors. An upgrade of the monochromatorsystem is planned for 2006 which includes perfectly bent silicon crystals in order to optimise bothintensity and angular resolution yielding a large gain of the diffractometer efficiency for strainmeasurements. A range of equipment for sample positioning is available, such as a closed Euleriancradle for samples with weights of up to 5 kg, a second cradle for heavy samples (up to 50 kg) withthe ability to tilt the samples up to 90° and a translation table carrying samples of up to 300 kg and1000 mm in diameter. Gauge volumes can be adjusted by a new computer controlled variable slitsystemin a range from 1x1x1 mm³ up to several mm³. In-situ residual stress analysis can beperformed within industrial components during mechanical or thermal loading (up to 2000 K).Rapid data visualization as well as evaluation is performed by the specially designed software. Thepowder diffraction pattern is calculated by summation over the scattering angle dependent Debye-Scherrer lines on the two-dimensional 400*400 mm² planar area detector.A large amount of beam time is exclusively used for industrial research. Among the componentsthat were investigated are crankshafts, impellers, pistons, cylinder heads, turbine blades and welds.Both instruments are similarly designed, where E3 is set up for higher flux and therefore penetrationdepths and E7 is designed for higher angular resolution
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.223.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
    Letterbox Type Repair Weld Finite Element Simulation and Residual Stress Prediction (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 445-450 
    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: Finite element prediction of residual stresses in a 3-bead letterbox-type repair weld isinvestigated in the present study. The repair is performed on a 2¼CrMo low alloy ferritic steelplate, containing a machined central groove where three weld beads are deposited using ALCROMO S 225 2¼CrMo electrodes. The proposed simulation procedure, which is based ondecoupled thermal and mechanical analyses and the “birth and death of elements” technique, isevaluated through comparison of predicted stresses with neutron diffraction testing data. Parametricstudies include modelling aspects such as 2-D plane strain versus 3-D analysis, re-melting of weldmaterial during sequential bead deposition, melting of base plate near the fusion line and annealing.It is concluded that numerical results come, in general, in satisfied agreement with the experimentaldata
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.445.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
    Residual Strain Measurement of C/C-SiC Tubes at High Temperature (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 665-670 
    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: As part of the European project “high and ultrahigh temperature heat exchangers”(HITHEX) the prediction and experimental assessment of the lifetime behaviour, characterisationand qualification of particular CMC materials, including carbon fibre reinforced carbonsiliconcarbides(C/C-SiC), has been executed. Part of the programme of the HITHEX project wasthe measurement of the strain development within the C/C-SiC tubular specimens from room tohigh temperature, the results of which are presented here. Residual strains have been determined inseveral specimens by neutron diffraction at the High Flux Reactor (HFR) of the Joint ResearchCentre in Petten, The Netherlands. At the HFR two facilities are available for residual straininvestigations. Both instruments were utilised in the investigations. The first facility at beam tubeHB5, the combined stress and powder diffractometer, employs a constant neutron wavelength of0.257 nm, and the second facility at HB4, the Large Component Neutron diffraction facility,LCNDF, has a flexible wavelength. The installation of a vacuum furnace has enabled the residualstrain measurement of specimens at high temperature on HB4. The furnace had to fulfil three maincriteria for the investigation of these specimens; high-temperature, good neutron penetration andnegligible oxidation of the specimens. The ceramic specimens, which have outer and innerdiameters of 50 and 40 mm, respectively, and a length of 100 mm have been measured totemperatures of up to 1450°C. Measurements were carried out in two directions on the SiC phase ofseveral specimens, i.e. in the radial and tangential (hoop) directions. The implications of theseresults with respect to the structural integrity assessment of these components at high temperaturesare discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.665.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
    Residual Stress and Microstructural Variations in Thick Aluminium Alloy Forgings (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 45-50 
    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 most critical stage in the heat treatment of high strength aluminium alloys is therapid cooling necessary to form a supersaturated solid solution. During cold water quenching ofthick sections, the thermal gradients are sufficient to cause inhomogeneous plastic deformationwhich in turn leads to the development of large residual stresses. Two 215 mm thick rectilinearforgings made from 7075 and 7010 were heat treated, and the through thickness residual stressesmeasured by neutron diffraction and deep hole drilling. The distribution of residual stresses wasfound to be similar for both alloys varying from highly triaxial and tensile in the core to a state ofbiaxial compression in the surface. The 7010 forging exhibited significantly larger tensile stressesin the core. 7075 is a much more quench sensitive alloy when compared to 7010. This results in lossof supersaturation by second phase precipitation during quenching in the core of the 7075 forging
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.45.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Neutron Strain Investigations of Laser Bent Samples (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 63-68 
    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: Bending of metal plates with high-energy laser beams presents a flexible materialsforming technique where bending results from the establishment of a steep temperature gradientthrough the material thickness. This inevitably leads to non-uniform thermal expansion/contractionand subsequently residual stresses. Non destructive residual strain mapping with neutrondiffraction through the 8mm thickness of a series WA 300 grade structural steel plate samples,focused on the region straddling the centerline of the heating bead location, shows the presence oflarge residual stress fields. Directly below the laser track the longitudinal strains are tensile anddominant, normal strains compressive and transverse strains slightly tensile. The magnitudes of thestrains decrease outside the width of the laser beam footprint. The first laser pass induces throughthicknessstrains close to yield, whereafter their magnitudes decrease with increased number of laserbeam passes. A comprehensive mapping of the longitudinal stresses as function of the number oflaser passes is given
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.63.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Problems in the Averaging of Neutron Diffraction Stress Data from Round-Robin Campaigns (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 283-288 
    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: In recent years the use of a special Bayesian approach on averaging ‘round-robin’ residualstress data has been implemented. This averaging approach is useful in that it copes with thesituation where systematic errors have occurred in one or more of the measurements and thusdiminishes the influence of these particular ‘wrong value’ outlier data points. The analyses not onlytake into account the measurand value, but also the uncertainties associated with each measurand. Itshould deal with data that may contain individual members with uncertainties larger than the statederror and assumes that the quoted error bar is only a lower bound on the uncertainty. This workshows what could happen when there is a ‘strong mismatch’ in uncertainties when averaging over alimited amount of data. It has been observed that in a case where there are few data points (forexample 5 or less), a strong bias can occur towards data points with a relatively small quoteduncertainty compared to other data points with larger quoted uncertainties. A ‘mismatch’ inuncertainty quotation can arise when averaging very good data with poorer data or when averagingwith data obtained from other measurement techniques. This effect is demonstrated in this work byusing fictitious data and also based on the example of real measurement data obtained by neutrondiffraction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.283.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Measurement of Residual Stress Through a Shot Peened Surface Subjected to Successive Material Removal (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 404-407 (Aug. 2002), p. 653-658 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.404-407.653.pdf
    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...