Hußnätter W (2007)
Publication Type: Journal article
Publication year: 2007
Publisher: None
Book Volume: 344
Pages Range: 105-112
DOI: 10.4028/0-87849-437-5.105
The dimensioning of tools and components in fields of metal forming is more and more based on process modeling and numerical simulation and therefore the material data are of main importance. Since the mechanical behavior of components in sheet metal forming processes highly differs according to real, i.e. biaxial stress condition because of anisotropic effects, the knowledge of material properties based on experimental investigations by biaxial loading is essential. Therefore, a novel experimental setup for the determination of yield loci has been developed at the Chair of Manufacturing Technology (LFT) in Erlangen. In this paper this setup is introduced. In comparison to existing setups me design of kinematics of the LFT-setup is sniplified and therefore the controllability of loading and measuring devices is enhanced. On the one hand the strains are directly measured by an optical measurement system, but on the other hand the regarding yield stresses cannot experimentally be determined, they have to be calculated from the quotient of force and the representative cross-sectional area of the specimen. Thus, a very detailed determination of both forces and cross section of the sheet is necessary. Since the specimens are not actively loaded, the reaction forces in rolling direction (RD) and transverse direction (TO) have to be calculated from the measured contact forces between tool and sheet to achieve the first component for the quotient. Using the results of the thinning analysis of the sheets it can be noticed, that the area of plastification is not constant for increasing forming. Therefore, the calculation of the yield stress must contain a variable formulation for the cross-sectional area.
APA:
Hußnätter, W. (2007). Detection of the real plastification in a biaxial tension test. Key Engineering Materials, 344, 105-112. https://dx.doi.org/10.4028/0-87849-437-5.105
MLA:
Hußnätter, Wolfgang. "Detection of the real plastification in a biaxial tension test." Key Engineering Materials 344 (2007): 105-112.
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