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RISS 인기검색어
- 검색키워드
- 저자 : Vincze, Gabriela (검색결과 7 건)
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COLLINEARITY AND SPIN FREEZING
I. Vincze,T. Kemény 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
An overview will be given on recent Mossbauer and magnetization investigation of the applied field dependence of the magnetic properties of typical systems without strong magnetic anisotropy and showing the absence of magnetic saturation in high fields (including iron-rich spin glass (amorphous Fe_(93)Zr_7), soft ferromagnets (amorphous Fe_(88)Zr₁₂ Fe_(70)Ni_(20)Zr_(10) and Fe_(88)B₁₂) and pure Fe). The results emphasize that shape anisotropy due to surface irregularities causes misalignment between the magnetization and the applied field in the otherwise collinear magnetic structure.
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Towards robust Room Structure Segmentation in Manhattan-like Environments from dense 2.5D data
Sven Olufs,Markus Vincze 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In this paper we propose a novel approach for the robust segmentation of room structure using Manhattan world assumption i.e. the frequently observed dominance of three mutually orthogonal vanishing directions in man-made environments. First, separate histograms are generated for the Cartesian major axis, i.e. X, Y and Z, on 2.5D data with an arbitrary roll, pitch and yaw rotation. Using the traditional Markov particle filters and minimal entropy as metric on the histograms, we are able to estimate the camera orientation with respect to orthogonal structure. Once the orientation is estimated we extract a hypotheses of the room structure by exploiting 2D histograms using mean shift clustering techniques as rough estimate for a pre-segmentation of voxels i.e. plane orientation and position. We apply superpixel over segmentation on the colour input to achieve a dense segmentation. The over segmentation and pre-segmented voxels are combined using graph-cuts for a not a-priori known number of final plane segments with a α-expansion graph cut variant proposed by Delong et al. with polynomial runtime. We show the robustness of our approach with respect to noise in real world data.
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Effect of Asymmetric Rolling on Plastic Anisotropy of Low Carbon Steels during Simple Shear Tests
JJ Gracio,HJ Kim,G Vincze,BB Panigrahi,F Barlat,EF Rauch,JW Yoon 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Simple shear tests are performed on low carbon steel pre-deformed in conventional, asymmetric and orthogonal-asymmetric rolling. The simple-shear tests were carried out at 0º, 45º and 135º with respect to the previous rolling direction. For a reduction ratio of 15%, a transient stagnation in the hardening rate is observed at reloading for all changes in strain path. The shear stress level, the hardening rate and extent of the plateau appear to be insensitive to the preliminary applied rolling conditions. After a reduction ratio of 50%, plastic instability was detected at reloading for all the changes of strain path and rolling conditions studied. A specific heat treatment was then designed allowing the material to become ductile after rolling while retaining the fine microstructure and therefore the high strength. Promising results were obtained essentially for 45˚ shear tests.
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Plastic Instability in Complex Strain Paths Predicted by Advanced Constitutive Equations
Marilena.C. Butuc,Frederic Barlat,Jose J. Gracio,Gabriela Vincze 한국소성가공학회 2011 기타자료 Vol.2011 No.8
The present paper aims at predicting plastic instabilities under complex loading histories using an advanced sheet metal forming limit model. The onset of localized necking is computed using the Marciniak-Kuczinsky (MK) analysis [1] with a physically-based hardening model and the phenomenological anisotropic yield criterion Yld2000-2d [2]. The hardening model accounts for anisotropic work-hardening induced by the microstructural evolution at large strains, which was proposed by Teodosiu and Hu [3]. Simulations are carried out for linear and complex strain paths. Experimentally, two deep-drawing quality sheet metals are selected: a bake-hardening steel (BH) and a DC06 steel sheet. The validity of the model is assessed by comparing the predicted and experimental forming limits. The remarkable accuracy of the developed software to predict the forming limits under linear and non-linear strain path is obviously due to the performance of the advanced constitutive equations to describe with great detail the material behavior. The effect of strain-induced anisotropy on formability evolution under strain path changes, as predicted by the microstructural hardening model, is particularly well captured by the model.
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Constitutive modeling for path-dependent behavior and its influence on twist springback
Liao, Juan,Xue, Xin,Lee, Myoung-Gyu,Barlat, Fré,dé,ric,Vincze, Gabriela,Pereira, Antó,nio B. Elsevier 2017 International journal of plasticity Vol.93 No.-
<P><B>Abstract</B></P> <P>The aim of this study is to investigate the path-dependent elastic-plastic behavior of dual-phase steel and its influence on the prediction of twist springback in the channel forming process. The anisotropic hardening responses of the sheet material for non-proportional loading, as well as the degradation of the elastic modulus in uniaxial and biaxial tension are investigated. A recently proposed distortional plasticity model combined with a dislocation density-based hardening approach was adopted to describe the flow behavior of the material. The results indicate that the present model simultaneously reproduces all of the experimentally observed features for both load reversal and changes of the principal strain axis. This constitutive description is employed in the finite element analysis of the forming of two channels with obvious twist springback characteristics. The complex strain path changes during the forming process are then analyzed using a proposed indicator. Finally, the relevance of the load changes and the stress distribution in the channel regarding twist springback predictions are discussed. The influence of loading path-dependent elastic modulus degradation for the prediction of twist springback is also assessed based on two different application geometries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The enhanced HAH model captures DP500's plastic flow behavior at various strain path changes. </LI> <LI> Hardening model affects twist springback prediction in sheet forming. </LI> <LI> A proposed indicator represents well the complex loading path history. </LI> <LI> The influence of strain path changes other than pure load reversal is assessed. </LI> <LI> Path-dependent elastic behavior and its influence on twist springback are studied. </LI> </UL> </P>
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