STRAIN GRADIENT POLYCRYSTAL PLASTICITY ANALYSIS: FE MODELING AND SYNCHROTRON X-RAY DIFFRACTION

The results of a strain gradient finite element model of polycrystalline plastic deformation in an HCP alloy were analysed in terms of orientation-related meso-scale grain groups. The predictions for meso-scale elastic strains were post-processed to construct energy dispersive diffraction peak patterns. Synchrotron X-ray polycrystalline diffraction was thereafter employed to record experimentally multiple peaks from deformed samples of Ti -6 Al -4 V alloy. Model parameters were adjusted to provide the best simultaneous match to multiple peaks in terms of intensity, position and shape. The framework provides a rigorous means of validating polycrystal plasticity finite element model. The study represents an example of the parallel development of modelling and experimental tools that is useful for the study of statistically stored dislocations (SSDs) and geometrically necessary dislocations (GNDs) effects on the deformation behaviour of (poly)crystals.

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Tuning of Finite Element Model Parameters to Match Nonlinear Reduced Order Models

Nonlinear Structures & Systems, Volume 1 - Conference Proceedings of the Society for Experimental Mechanics Series ◽

10.1007/978-3-030-47626-7_18 ◽

2020 ◽

pp. 113-116

Author(s):

Kyusic Park ◽

Matthew S. Allen

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Element Model ◽

Model Parameters ◽

Reduced Order Models ◽

Reduced Order

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Individual Finite Element Model Based on the X-ray CT Data : Evaluation of the CT image attenuated by partial volume effect

The Proceedings of the JSME Conference on Frontiers in Bioengineering ◽

10.1299/jsmebiofro.2003.14.69 ◽

2003 ◽

Vol 2003.14 (0) ◽

pp. 69-70

Author(s):

Michihiko KOSEKI ◽

Yusuke KITAGAWA ◽

Norio INOU ◽

Koutarou MAKI

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Element Model ◽

Volume Effect ◽

Partial Volume Effect ◽

Data Evaluation ◽

Ct Image ◽

X Ray ◽

Partial Volume ◽

Ct Data

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An Effective Method for Determining Finite Element Model Parameters of Rotor Elastic Support System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.141.191 ◽

2011 ◽

Vol 141 ◽

pp. 191-197

Author(s):

Yong Xing Wang ◽

Jiang Yan ◽

Sheng Ze Wang

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Support System ◽

Structural Parameters ◽

Element Model ◽

Elastic Support ◽

Asymmetric Structure ◽

Model Parameters ◽

Equivalent Stiffness ◽

Rolling Ball

A finite element model of the elastic support rotor system based on the corresponding experimental model was established. According to the principle of two types of model with an equal first order critical speed, the equivalent stiffness and damping of a rolling ball bearing support system with rubber rings determined by experiment were transferred into the finite element model. Then, the dynamic behavior of rotor systems with symmetric and asymmetric structure, different support system stiffness and support span were calculated and analyzed respectively. At last, the influence of the rotor structural parameters on the equivalent stiffness of elastic bearing support system obtained by experiment was pointed out.

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Numerical and Experimental Analysis of Self Piercing Riveting Process with Carbon Fiber-Reinforced Plastic and Aluminium Sheets

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.554-557.1045 ◽

2013 ◽

Vol 554-557 ◽

pp. 1045-1054 ◽

Cited By ~ 6

Author(s):

Welf Guntram Drossel ◽

Reinhard Mauermann ◽

Raik Grützner ◽

Danilo Mattheß

Keyword(s):

Finite Element ◽

Carbon Fiber ◽

Finite Element Model ◽

Simulation Model ◽

Process Parameters ◽

Process Model ◽

Element Model ◽

Model Parameters ◽

Fiber Reinforced ◽

Carbon Fiber Reinforced

In this study a numerical simulation model was designed for representing the joining process of carbon fiber-reinforced plastics (CFRP) and aluminum alloy with semi-tubular self-piercing rivet. The first step towards this goal is to analyze the piercing process of CFRP numerical and experimental. Thereby the essential process parameters, tool geometries and material characteristics are determined and in finite element model represented. Subsequently the finite element model will be verified and calibrated by experimental studies. The next step is the integration of the calibrated model parameters from the piercing process in the extensive simulation model of self-piercing rivet process. The comparison between the measured and computed values, e.g. process parameters and the geometrical connection characteristics, shows the reached quality of the process model. The presented method provides an experimental reliable characterization of the damage of the composite material and an evaluation of the connection performances, regarding the anisotropic property of CFRP.

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Application of a FRF Based Model Updating Technique for the Validation of Finite Element Models of Components of the Automotive Industry

Volume 3C: 15th Biennial Conference on Mechanical Vibration and Noise — Vibration Control, Analysis, and Identification ◽

10.1115/detc1995-0695 ◽

1995 ◽

Author(s):

Stefan Lammens ◽

Marc Brughmans ◽

Jan Leuridan ◽

Ward Heylen ◽

Paul Sas

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Automotive Industry ◽

Stiffness Matrix ◽

Model Updating ◽

Dynamic Stiffness ◽

Element Model ◽

Model Parameters ◽

Finite Element Models ◽

Analytical Dynamic

Abstract This paper presents two applications of the RADSER model updating technique (Lammens et al. (1995) and Larsson (1992)). The RADSER technique updates finite element model parameters by solution of a linearised set of equations that optimise the Reduced Analytical Dynamic Stiffness matrix based on Experimental Receptances. The first application deals with the identification of the dynamic characteristics of rubber mounts. The second application validates a coarse finite element model of a subframe of a Volvo 480.

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Strain gradient finite element model for finite deformation theory: size effects and shear bands

Computational Mechanics ◽

10.1007/s00466-020-01816-2 ◽

2020 ◽

Vol 65 (5) ◽

pp. 1219-1246 ◽

Cited By ~ 1

Author(s):

Yooseob Song ◽

George Z. Voyiadjis

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Strain Gradient ◽

Finite Deformation ◽

Size Effects ◽

Deformation Theory ◽

Shear Bands ◽

Element Model ◽

Finite Deformation Theory

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Curvature reduces bending strains in the quokka femur

PeerJ ◽

10.7717/peerj.3100 ◽

2017 ◽

Vol 5 ◽

pp. e3100 ◽

Cited By ~ 4

Author(s):

Kyle McCabe ◽

Keith Henderson ◽

Jess Pantinople ◽

Hazel L. Richards ◽

Nick Milne

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Linear Relationship ◽

Strain Gradient ◽

Stance Phase ◽

Element Model ◽

Knee Extensors ◽

Bending Strain ◽

Biarticular Muscles ◽

The Relationship

This study explores how curvature in the quokka femur may help to reduce bending strain during locomotion. The quokka is a small wallaby, but the curvature of the femur and the muscles active during stance phase are similar to most quadrupedal mammals. Our hypothesis is that the action of hip extensor and ankle plantarflexor muscles during stance phase place cranial bending strains that act to reduce the caudal curvature of the femur. Knee extensors and biarticular muscles that span the femur longitudinally create caudal bending strains in the caudally curved (concave caudal side) bone. These opposing strains can balance each other and result in less strain on the bone. We test this idea by comparing the performance of a normally curved finite element model of the quokka femur to a digitally straightened version of the same bone. The normally curved model is indeed less strained than the straightened version. To further examine the relationship between curvature and the strains in the femoral models, we also tested an extra-curved and a reverse-curved version with the same loads. There appears to be a linear relationship between the curvature and the strains experienced by the models. These results demonstrate that longitudinal curvature in bones may be a manipulable mechanism whereby bone can induce a strain gradient to oppose strains induced by habitual loading.

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