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    Generation of Cyclic Stress-Strain Curves for Sheet Metals

    Source: Journal of Engineering Materials and Technology:;2001:;volume( 123 ):;issue: 004::page 391
    Author:
    K. M. Zhao
    ,
    J. K. Lee
    DOI: 10.1115/1.1395021
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The main objective of this paper is to obtain the first few stress-strain loops of sheet metals from reverse loading so that the springback can be simulated accurately. Material parameters are identified by an inverse method within a selected constitutive model that represents the hardening behavior of materials subjected to a cyclic loading. Three-point bending tests are conducted on sheet steels (mild steel and high strength steel). Punch stroke, punch load, bending strain, and bending angle are measured directly during the tests. Bending moments are then computed from these measured data. Bending moments are also calculated based on a constitutive model. Normal anisotropy and nonlinear isotropic/kinematic hardening are considered. Material parameters are identified by minimizing the normalized error between two bending moments. Micro-genetic algorithm is used in the optimization procedure. Stress-strain curves are generated with the material parameters found in this way, which can be used with other plastic models.
    keyword(s): Sheet metal , Stress , Hardening , Stress-strain curves , Optimization , Anisotropy AND Constitutive equations ,
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      Generation of Cyclic Stress-Strain Curves for Sheet Metals

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    http://yetl.yabesh.ir/yetl1/handle/yetl/125269
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    contributor authorK. M. Zhao
    contributor authorJ. K. Lee
    date accessioned2017-05-09T00:04:59Z
    date available2017-05-09T00:04:59Z
    date copyrightOctober, 2001
    date issued2001
    identifier issn0094-4289
    identifier otherJEMTA8-27024#391_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/125269
    description abstractThe main objective of this paper is to obtain the first few stress-strain loops of sheet metals from reverse loading so that the springback can be simulated accurately. Material parameters are identified by an inverse method within a selected constitutive model that represents the hardening behavior of materials subjected to a cyclic loading. Three-point bending tests are conducted on sheet steels (mild steel and high strength steel). Punch stroke, punch load, bending strain, and bending angle are measured directly during the tests. Bending moments are then computed from these measured data. Bending moments are also calculated based on a constitutive model. Normal anisotropy and nonlinear isotropic/kinematic hardening are considered. Material parameters are identified by minimizing the normalized error between two bending moments. Micro-genetic algorithm is used in the optimization procedure. Stress-strain curves are generated with the material parameters found in this way, which can be used with other plastic models.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleGeneration of Cyclic Stress-Strain Curves for Sheet Metals
    typeJournal Paper
    journal volume123
    journal issue4
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.1395021
    journal fristpage391
    journal lastpage397
    identifier eissn1528-8889
    keywordsSheet metal
    keywordsStress
    keywordsHardening
    keywordsStress-strain curves
    keywordsOptimization
    keywordsAnisotropy AND Constitutive equations
    treeJournal of Engineering Materials and Technology:;2001:;volume( 123 ):;issue: 004
    contenttypeFulltext
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