scholarly journals Numerical Verification of Simplified Identification Method of Yield Function Using Circumscribing Polygon of Yield Locus

2019 ◽  
Vol 60 (700) ◽  
pp. 136-141
Author(s):  
Hideo TAKIZAWA ◽  
Shohei KODAMA
Keyword(s):  
Yield Function ◽  
Yield Locus ◽  
Numerical Verification ◽  
Identification Method

scholarly journals A hybrid approach for the efficient computation of polycrystalline yield loci with the accuracy of the crystal plasticity finite element method

2022 ◽  
Author(s):  
Abhishek Biswas ◽  
Surya R Kalidindi ◽  
Alexander Hartmaier
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Crystal Plasticity ◽  
Hybrid Method ◽  
Hybrid Approach ◽  
Yield Function ◽  
Yield Locus ◽  
Stress Space ◽  
Crystal Plasticity Finite Element ◽  
Yield Loci

Abstract Direct experimental evaluation of the anisotropic yield locus of a given material, representing the zeros of the material's yield function in the stress space, is arduous. It is much more practical to determine the yield locus by combining limited measurements of yield strengths with predictions from numerical models based on microstructural features such as the orientation distribution function (ODF; also referred to as the crystallographic texture). For the latter, several different strategies exist in the current literature. In this work, we develop and present a new hybrid method that combines the numerical efficiency and simplicity of the classical crystallographic yield locus (CYL) method with the accuracy of the computationally expensive crystal plasticity finite element method (CPFEM). The development of our hybrid approach is presented in two steps. In the first step, we demonstrate for diverse crystallographic textures that the proposed hybrid method is in good agreement with the shape of the predicted yield locus estimated by either CPFEM or experiments, even for pronounced plastic anisotropy. It is shown that the calibration of only two parameters of the CYL method with only two yield stresses for different load cases obtained from either CPFEM simulations or experiments produces a reliable computation of the polycrystal yield loci for diverse crystallographic textures. The accuracy of the hybrid approach is evaluated using the results from the previously established CPFEM method for the computation of the entire yield locus and also experiments. In the second step, the point cloud data of stress tensors on the yield loci predicted by the calibrated CYL method are interpolated within the deviatoric stress space by cubic splines such that a smooth yield function can be constructed. Since the produced yield locus from the hybrid approach is presented as a smooth function, this formulation can potentially be used as an anisotropic yield function for the standard continuum plasticity methods commonly used in finite element analysis.

Study of Identification Method of Drunk Driving Based on Wavelet Analysis

ICCTP 2011 ◽  
2011 ◽  
Author(s):  
Xing-jian Zhang ◽  
Xiao-hua Zhao ◽  
Jian Rong ◽  
Shi-li Xu
Keyword(s):  
Wavelet Analysis ◽  
Drunk Driving ◽  
Identification Method

An Identification Method of Related Group of Threads for a Recent Bug Thread by Peak Characteristics of Similarities

2012 ◽  
Vol 132 (2) ◽  
pp. 231-237
Author(s):  
Yuuki Imanara ◽  
Kota Itakura ◽  
Masaki Samejima ◽  
Masanori Akiyoshi
Keyword(s):  
Identification Method ◽  
Related Group

An Identification Method of Magnetizing Inrush Current Phenomena in Distribution System

2010 ◽  
Vol 130 (4) ◽  
pp. 430-436 ◽  
Author(s):  
Naoki Dou ◽  
Atushi Toyama ◽  
Kohki Satoh ◽  
Tadashi Naitoh ◽  
Kazuyuki Masaki
Keyword(s):  
Distribution System ◽  
Inrush Current ◽  
Identification Method ◽  
Magnetizing Inrush Current

An Identification Method of Magnetizing Inrush Current Phenomena by Voltage Waveform

2012 ◽  
Vol 132 (6) ◽  
pp. 588-596
Author(s):  
Tadashi Naitoh ◽  
Keiki Takeda ◽  
Atsushi Toyama ◽  
Tatsuhiko Maeda
Keyword(s):  
Inrush Current ◽  
Voltage Waveform ◽  
Identification Method ◽  
Magnetizing Inrush Current

An Improved Identification Method of Magnetizing Inrush Current Phenomena in Distribution System

2012 ◽  
Vol 132 (3) ◽  
pp. 260-267 ◽  
Author(s):  
Tatsuhiko Maeda ◽  
Tadashi Naitoh ◽  
Atsushi Toyama ◽  
Keiki Takeda
Keyword(s):  
Distribution System ◽  
Inrush Current ◽  
Identification Method ◽  
Magnetizing Inrush Current
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