scholarly journals Microstructural Modeling of Rheological Mechanical Response for Asphalt Mixture Using an Image-Based Finite Element Approach

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2041 ◽  
Author(s):  
Wenke Huang ◽  
Hao Wang ◽  
Yingmei Yin ◽  
Xiaoning Zhang ◽  
Jie Yuan
Keyword(s):  
Finite Element ◽  
Mechanical Response ◽  
Micromechanical Model ◽  
Asphalt Mixture ◽  
Simulation Software ◽  
Fe Model ◽  
Finite Element Approach ◽  
X Ray ◽  
Element Approach ◽  
Asphalt Mortar

In this paper, an image-based micromechanical model for an asphalt mixture’s rheological mechanical response is introduced. Detailed information on finite element (FE) modeling based on X-ray computed tomography (X-ray CT) is presented. An improved morphological multiscale algorithm was developed to segment the adhesive coarse aggregate images. A classification method to recognize the different classifications of the elemental area for a confining pressure purpose is proposed in this study. Then, the numerical viscoelastic constitutive formulation of asphalt mortar in an FE code was implemented using the simulation software ABAQUS user material subroutine (UMAT). To avoid complex experiments in determining the time-dependent Poisson’s ratio directly, numerous attempts were made to indirectly obtain all material properties in the viscoelastic constitutive model. Finally, the image-based FE model incorporated with the viscoelastic asphalt mortar phase and elastic aggregates was used for triaxial compressive test simulations, and a triaxial creep experiment under different working conditions was conducted to identify and validate the proposed finite element approach. The numerical simulation and experimental results indicate that the three-dimensional microstructural numerical model established can effectively analyze the material’s rheological mechanical response under the effect of triaxial load within the linear viscoelastic range.

scholarly journals A finite element approach to x-ray optics design

2017 ◽  
Author(s):  
A. P. Honkanen ◽  
C. Ferrero ◽  
J. P. Guigay ◽  
V. Mocella
Keyword(s):  
Finite Element ◽  
Ray Optics ◽  
Finite Element Approach ◽  
X Ray ◽  
Element Approach ◽  
Optics Design

scholarly journals A finite-element approach to dynamical diffraction problems in reflection geometry

2018 ◽  
Vol 51 (2) ◽  
pp. 514-525 ◽  
Author(s):  
Ari-Pekka Honkanen ◽  
Claudio Ferrero ◽  
Jean-Pierre Guigay ◽  
Vito Mocella
Keyword(s):  
Finite Element ◽  
Weak Form ◽  
Finite Element Approach ◽  
X Ray ◽  
Diffracted Waves ◽  
Element Approach ◽  
Reflection Geometry ◽  
Reference Implementation ◽  
New Formulation ◽  
Focusing Properties

A finite-element approach to the numerical solution of the Takagi–Taupin equations expressed in a weak form is presented and applied to simulate the X-ray reflectivity curves, spatial intensity distributions and focusing properties of bent perfect crystals in symmetric reflection geometry. The proposed framework encompasses a new formulation of the Takagi–Taupin equations, which appears to be promising in terms of robustness and stability and supports the Fresnel propagation of the diffracted waves. The presented method is very flexible and has the potential of dealing with dynamical X-ray or neutron diffraction problems related to crystals of arbitrary shape and deformation. The reference implementation based on the commercial COMSOLMultiphysicssoftware package is available to the relevant user community.

An Inverse Finite Element Approach to Calculate Full-Field Forming Strains

2015 ◽  
Vol 651-653 ◽  
pp. 363-368 ◽  
Author(s):  
Roland Ritt ◽  
Martín Machado ◽  
Michael Fischlschweiger ◽  
Zoltan Major ◽  
Thomas Antretter
Keyword(s):  
Finite Element ◽  
Higher Order ◽  
Fe Analysis ◽  
Fe Model ◽  
Rectangular Grid ◽  
Full Field ◽  
Finite Element Approach ◽  
Element Approach ◽  
Grid Points

A methodology to calculate surface strains from a rectangular grid placed on a forming blank is introduced. This method consists of treating the grid points as nodes of a finite element (FE) model and assigning elements to the grid. The strains are then computed following FE analysis. If higher order elements are used, also more information within the element can be obtained which allows a coarser grid without loss of accuracy. This is the major advantage of the approach presented herein.

scholarly journals A fast fuzzy finite element approach for laterally loaded pile in layered soils

2018 ◽  
Vol 12 (3) ◽  
pp. 1-9
Author(s):  
Pham Hoang Anh
Keyword(s):  
Finite Element ◽  
Soil Parameters ◽  
Fe Model ◽  
Finite Element Approach ◽  
Fuzzy Variables ◽  
Laterally Loaded Pile ◽  
Element Approach ◽  
Fuzzy Finite Element ◽  
Extreme Responses ◽  
Laterally Loaded

A fuzzy finite element approach for static analysis of laterally loaded pile in multi-layer soil with uncertain properties is presented. The finite element (FE) formulation is established using a beam-on-two-parameter foundation model. Based on the developed FE model, uncertainty propagation of the soil parameters to the pile response is evaluated by mean of the α-cut strategy combined with a response surface based optimization technique. First order Taylor's expansion representing the pile responses is used to find the binary combinations of the fuzzy variables that result in extreme responses at an α-level. The exact values of the extreme responses are then determined by direct FE analysis at the found binary combinations of the fuzzy variables. The proposed approach is shown to be accurate and computationally efficient. Article history: Received 05 October 2017, Revised 05 March 2018, Accepted 27 April 2018

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