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
Filter
Collection
Keywords
Publisher
Language
Years
  • 1
    facet.materialart.
    Unknown
    Chapter Formability and Performance of Al-Zn-Mg-Cu Alloys with Different Initial Tempers in Creep Aging Process (2021)
    InTechOpen
    Details
    Publication Date: 2024-04-11
    Description: The initial temper may directly affect the deformation behavior and material performance in creep age forming (CAF) process. Five heat treatment states are selected as the initial tempers for CAF, namely, solution, peak-aging (T6), over-aging (T73), retrogression and re-solution. The formability and performance of an Al-Zn-Mg-Cu alloy with the above initial tempers in creep aging process are investigated via using creep and stress relaxation aging tests, mechanical property tests, corrosion resistance tests and microstructure analysis. The differences of formability are attributed to the inhibitions of different distributed matrix precipitates (MPts) on the dislocation movement, namely, the more coarsening the MPts is, the easier the dislocation movement. During creep aging process, the mechanical properties are improved for the solution, retrogression and re-solution tempers with fine MPts, but reduced for the T6 and T73 tempers due to coarsening of MPts. Since the distribution of grain boundary precipitates (GBPs) becomes discontinuous, the corrosion resistances of the creep aged specimens are enhanced for all initial tempers. Taking both mechanical properties and corrosion resistances into account, the re-solution temper may be a preferable choice to achieve high performance of the components beyond the precise shape in CAF.
    Keywords: Al-Zn-Mg-Cu alloy, creep age forming, initial temper, precipitate, formability, mechanical property, corrosion resistance ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDP Other manufacturing technologies::TDPM Metals technology / metallurgy
    Language: English
    Format: image/jpeg
    Format: image/jpeg
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Rotational alignment of products from NOCl+Sr chemiluminescent reaction (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1819-1823 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The chemiluminescent reactions Sr+NOCl→SrCl(A,B)+NO are studied under the single collision conditions in a beam-gas arrangement. The product rotational alignment 〈P2(J(circumflex)′⋅k(circumflex))〉=−0.40±0.05 for SrCl(B) is obtained from Sr+NOCl chemiluminescent reactions. In addition, the electronic state branching ratio and the product vibrational state distribution have been roughly estimated by simulating the chemiluminescent spectra of SrCl. Quasiclassical trajectory (QCT) calculations for the Sr+NOCl reaction as a three-body system have been carried out. The calculated results agree well with the experimental ones. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476757
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Application Research on Expert System of Incremental In-Plane Bending (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 600-605 
    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: Incremental in-plane bending is a flexible and laborsaving manufacturing technology forshort production runs in a variety of sizes and shapes. But the technology parameters are interactiveintimately and it is hard to forecast and control the bending radius accurately. Based on the features ofincremental in-plane bending and the advantage of expert system dealing with problems, an expertsystem of incremental in-plane bending by designing knowledge base of representation of creationregulation, reasoning system based on rules and search mechanism and explaining system based onprefabricating text has been researched and developed in this paper. The system, making use of ADOtechnology, Access database and Visual Basic, develops knowledge base, database and reasoningsystem. Based on client / server model, the system realizes a seamless link between Visual Basic andMatlab by using ActiveX. The system can perform functions of bending radius forecasting andforming program evaluating and optimizing. It has a friendly interface and it is easy to operate andconvenient for maintenance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.600.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Finite Element Analysis on Microstructure Evolution of Hot Ring Rolling Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1455-1460 
    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: Hot ring rolling (HRR) is a 3D unsteady-state and coupled thermo-mechanical process, themetal undergoes complicated unequal deformation and microstructure evolution. In this paper a 3Drigid-plastic and coupled thermo-mechanical FEM model for hot ring rolling was developed based onDEFORM3D platform, taking dynamic recrystallization (DRX) volume fraction, DRX grain size,recystallization volume fraction and average grain size as objects, the mechanism of materialmicrostructure evolution and distributions in HRR process are thoroughly studied. The results showthat: with the HRR progressing, the DRX volume fraction, volume fraction, DRX grain size andaverage grain size have the similar distributing characteristic, and the distribution zones expand froma small local area into the whole ring strip, then diffuse to the mid-layer of ring with smalldeformation, their distributions become more uniform. Meanwhile with increase of deformation, thevalues of the DRX volume fraction and recrystallization volume fraction augment, i.e. the degree ofrecystallization increases. The DRX grain size also augments due to local high temperature, while theaverage grain size decreases. In general during HRR process the distributions of DRX volumefraction, recrystallization volume fraction, DRX grain size, and average grain size are ununiform dueto unequal deforming in HRR process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1455.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Research on Precision Forging Law of Complicated Blade by Using 3D FE Simulation and Physical Modeling (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 471-472 (Dec. 2004), p. 839-843 
    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: Research on precision forming laws of complicated blade has been a challenging issue on international frontiers of plastic forming areas. The precision forging laws of the blade with a damper platform have been obtained by using 3D FE simulation and physical modeling. The laws involve in the deforming characteristics of the tenon, damper platform, middle blade body, and tip blade body, such as the unevenness of deformation and material flow, the branch-flow of material, material flow characteristic of the blade body and rotation forming characteristic of the damper platform. The research may serve as a guide to the optimization design of relevant process and dies
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.471-472.839.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Wrinkling Limit Based on FEM Virtual Experiment during NC Bending Process of Thin-Walled Tube (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 471-472 (Dec. 2004), p. 498-502 
    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: A definition of forming limit is given with minimum centerline radius min R beforewrinkling for NC bending process of thin-walled tube. Based on the developed FEM wrinkling prediction system TBWS-3D, an effective searching algorithm of wrinkling limit is proposed and forming limit can be obtained conveniently. Thus influence laws of main forming parameters on wrinkling limit are investigated and revealed. Measures to improve forming limit is put forward consequently. The achievements may help to both practice of thin-walled precise tube bending and research of plastic wrinkling
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.471-472.498.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Simulation for Guide Roll in 3D-FE Analysis of Cold Ring Rolling (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 471-472 (Dec. 2004), p. 760-764 
    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: A simple and efficient method has been proposed in order to determine the dynamic speed boundary condition caused by the guide rolls for developing the 3D-FE model of cold ring rolling process rapidly. The concept of the motion track of guide rolls has been put forward firstly and an optimal motion track and track type are given by simulation. Meanwhile, an effect of the guide rolls on the ring tilting and ring circularity was simulated and analyzed. The result shows that the simulation results are in good agreement with experiment results from the literature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.471-472.760.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Research on the Curvature Radius of Roller-Trace in the Forming Process of Conventional Spinning (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 277-280 
    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: Based on the 3D FE model of conventional spinning, the influence of curvature radiusof roller-trace on the conventional spinning process has been studied. It is found that when thecurvature radius of roller-trace is smaller, the maximum of thinning rate and hoop compressivestress increases dramatically with the increasing of the radius, and curvature radius does littleeffect on the forming process when it is up to a critical value. To obtain a more reasonableselection criterion of curvature radius of roller-trace, a new index named flange width has beenput forward， which represents the comprehensive effect of workpiece diameter and mandreldiameter in the forming process of conventional spinning. Further research has been done and theselection criterion of curvature radius is obtained: the smaller the flange width is or the larger theworkpiece thickness or the entry tangential angle is, the larger the range of reasonable curvatureradius is
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.277.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Research on Stress and Strain Distribution during Multi-Pass Conventional Spinning under Different Roller Motion Modes (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 205-208 
    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: Establishing a reasonable mechanical model for multi-pass conventional spinning andtypical drawing spinning is the object of the present study. Research on stress and strain distributionduring multi-pass conventional spinning processing under three modes of roller motion, i.e.,one-way moving without profiling, one-way moving with profiling, and two-way moving withprofiling, is carried out using elasto-plastic FEM method. Though the equivalent stress distributionunder these three modes of roller motion is similar, there exists significant difference in magnitude,with the equivalent stress in the close-mandrel area being the highest in the case of profiledone-way moving. As far as the strain is concerned, it has a similar distribution as the equivalentstress, with the strain in the close-mandrel area under one-way moving with profiling having thehighest value. In the case of roller two-way moving with profiling, the strain distribution is the mosthomogeneous, while the work-hardening of the blank is the most serious. In all cases, both stressand strain in the deforming zone increase with increasing spinning passes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.205.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Research on Variation of Stress and Strain Field and Wall Thickness during Cone Spinning (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 149-152 
    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: Cone spinning is an advanced but complex metal forming process under coupled effectsof multi-factors. Understanding the deformation mechanism, i.e., the stresses, strains, and metalflow in the deformation zone during the process is of great significance for optimizing the spinningprocess and controlling the product quality. In this paper, based on ABAQUS/Explicit, a reasonableFEM model for cone spinning with a single roller has been established, and the features of stress,strain and wall thickness during the process have been obtained. The results show the following: (1)In the beginning, large stress, large strain and the acute thinning of wall thickness localize at thesmall region below the roller, then the region extends into a small ring, further it becomes a largering, and finally the ring will become uneven if the wrinkling occurs in the flange. (2) Afterspinning, the acute thinning region locates at the midst of the wall near the bottom of the workpiece.(3) At earlier stage of cone spinning, as a result of the acute thinning of wall thickness in the wallzone, the unevenness of wall thickness increases sharply to a value, then it almost keeps the value atthe stable stage, and finally it will slowly increase again if the wrinkling appears in the flange. Theresults are helpful for determination and optimization of process parameters of cone spinning
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.149.pdf
    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...