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  • 1
    Electronic Resource
    Electronic Resource
    Numerical Modelling and Analysis of Ductile Crack Propagation in Blanking Process Using Modified Nodal Release Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 344 (July 2007), p. 201-208 
    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: Ductile fracture processes for discrete crack propagation using nodal release approach iswell established for modelling crack in metal sheet. In this method, the crack is assumed to initiateor propagate along the element edges; hence, a new crack is implemented in the FE mesh. InBlanking process, the crack trajectory is unknown; therefore a very fine mesh is required tosimulate a realistic crack propagation using the nodal release method. Consequently, the nodalrelease method has to be modified in which first the direction of crack extension is calculated andthen, accordingly, the local element topology near the crack-tip is modified such that the nodes ofelements are moved to predicted crack-tip in order to accommodate the crack extension. Theadvantage of this method is that it is possible to model the predicted crack with only slightmodification in the local mesh near to the crack tip. However, it is necessary to transfer historyvariables from old local elements of previous increment to the new local elements of the currentincrement at the vicinity of crack-tip. But this method can lead to slight loss of accuracy to predictthe subsequent crack extension due to interpolations. However, the advantage of this method is thatremeshing can be either completely eliminated or reduced to a greater extend during the simulation.Therefore, in this paper, modified nodal release method for modelling ductile crack propagationin blanking process with the uncoupled damage approach is presented, and is further implementedin commercial FE software - MSC.Marc® together with predefined user-subroutines
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.201.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Selective Strain Hardening of Structure Components by Action Media Based Cold Massive Forming (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 22 (Aug. 2007), p. 57-65 
    Details
    ISSN: 1662-8985
    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: High strength aluminium wrought alloys as well as powder metallurgical aluminiumalloys are limited regarding massive formability. The formability at room temperature can besignificantly affected by superimposing hydrostatic pressure. Depending on the process control, coldforming enables locally induced strain hardening effects, whereby increased hardness or hardnessgradients can be regulated. Simultaneously, the necessity of mechanical post processing is reducedby a metal forming fabrication of joint and connection elements at room temperature.By splitting the component in strengthened and not strengthened regions, specially adaptedproperty profiles can be adjusted to the application. Thus, specially load adapted components withlocally optimised property profiles e.g. ductile or high strength, brittle areas can be manufactured. Adefined buckling or folding of a component in case of a crash can thereby be achieved.In this project innovative tool principles for superimposed cold solid forming will be developed.They will be used to manufacture high strength and complex aluminium structure components withspecific adjustment of local strain hardening. A tool technique is to be created in order to generatelocally hardened areas within massive structures by metal forming. Furthermore, the task is todetermine the procedures limits for superimposed cold massive forming with specifically adjustedstrain hardening of aluminium alloys.For the realisation of these aims fundamental research has to be made, by which the coherencesbetween specific process parameters and the increased formability are determined. Furthermore, thecold hardening effects are to be adjusted by cold massive forming with superimposed hydrostaticpressure and displayed with the help of FEA.In the long term, the analysis aims at the development of pressure superimposed forming that istechnically utilisable as a near net shape manufacturing process for high complex aluminiumstructure components with selective adjustment of local properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.22.57.pdf
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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