Finite Element-Based Characterization of Pore-Scale Geometry and Its Impact on Fluid Flow

The objective of this paper is to review the application of the finite element-based CFD methods in mixing engineering. It provides a good opportunity to summarize the thirty five years of finite element achievements in the field of fluid flow started in the 70's, with the development of the first 2D Navier-Stokes solver for Newtonian and non-Newtonian viscous fluids, and extended in the 80's, with new solution algorithms to tackle 3D problems. For mixing simulations, a corner stone was the introduction of the "virtual finite element method" in the mid 90's for the simulation of flow systems with internal moving parts. In the on-going quest to improve the characterization of mixing systems for industrial needs, further developments are required, and progress could come from the next generation of computationally efficient multi-physics solvers.

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Effect of thermal gradient on structural relaxation and characterization of thermal stresses in dental porcelains – A finite element study

Journal of the Mechanical Behavior of Biomedical Materials ◽

10.1016/j.jmbbm.2021.104693 ◽

2021 ◽

pp. 104693

Author(s):

Prashant Shelar ◽

Sheila Butler

Keyword(s):

Finite Element ◽

Structural Relaxation ◽

Thermal Gradient ◽

Thermal Stresses ◽

Finite Element Study ◽

Element Study

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Mechanical Characterization of Compact Rolled‐up Microtubes using In‐situ Scanning Electron Microscopy Nanoindentation and Finite Element Analysis

Advanced Engineering Materials ◽

10.1002/adem.202100412 ◽

2021 ◽

Author(s):

Somayeh Moradi ◽

Nathanael Jöhrmann ◽

Dmitriy D. Karnaushenko ◽

Uwe Zschenderlein ◽

Daniil Karnaushenko ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Finite Element Analysis ◽

Finite Element ◽

Mechanical Characterization ◽

Element Analysis ◽

Scanning Electron

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Characterization of Mechanical Heterogeneity in Dissimilar Metal Welded Joints

Materials ◽

10.3390/ma14154145 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4145

Author(s):

He Xue ◽

Zheng Wang ◽

Shuai Wang ◽

Jinxuan He ◽

Hongliang Yang

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Welded Joints ◽

Structural Integrity ◽

Material Interfaces ◽

Mechanical Heterogeneity ◽

Finite Element Software ◽

Dissimilar Metal ◽

Stress Changes

Dissimilar metal welded joints (DMWJs) possess significant localized mechanical heterogeneity. Using finite element software ABAQUS with the User-defined Material (UMAT) subroutine, this study proposed a constitutive equation that may be used to express the heterogeneous mechanical properties of the heat-affected and fusion zones at the interfaces in DMWJs. By eliminating sudden stress changes at the material interfaces, the proposed approach provides a more realistic and accurate characterization of the mechanical heterogeneity in the local regions of DMWJs than existing methods. As such, the proposed approach enables the structural integrity of DMWJs to be analyzed in greater detail.

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Correlation of Global Quantities at Material Characterization of Pressure-Sensitive Materials Using Sharp Indentation Testing

Lubricants ◽

10.3390/lubricants9030029 ◽

2021 ◽

Vol 9 (3) ◽

pp. 29

Author(s):

Carl F. O. Dahlberg ◽

Jonas Faleskog ◽

Per-Lennart Larsson

Keyword(s):

Finite Element ◽

Material Characterization ◽

Pressure Sensitivity ◽

Pressure Sensitive ◽

The Mean ◽

Sharp Indentation ◽

Von Mises ◽

Von Mises Plasticity ◽

Hardness Values

Correlation of sharp indentation problems is examined theoretically and numerically. The analysis focuses on elastic-plastic pressure-sensitive materials and especially the case when the local plastic zone is so large that elastic effects on the mean contact pressure will be small or negligible as is the case for engineering metals and alloys. The results from the theoretical analysis indicate that the effect from pressure-sensitivity and plastic strain-hardening are separable at correlation of hardness values. This is confirmed using finite element methods and closed-form formulas are presented representing a pressure-sensitive counterpart to the Tabor formula at von Mises plasticity. The situation for the relative contact area is more complicated as also discussed.

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