Fractures in Carbonates: From Digital Outcrops to Mechanical Models

2011 ◽  
pp. 137-147 ◽  
Author(s):  
PAUL GILLESPIE ◽  
ERIK MONSEN ◽  
LAURENT MAERTEN ◽  
DAVID HUNT ◽  
JOHN THURMOND ◽  
...  
Keyword(s):  
Mechanical Models

Interactive Segmentation of Scanned Mechanical Models Based on Quadratic Surfaces Fitting

2019 ◽  
Vol 31 (7) ◽  
pp. 1210
Author(s):  
Zhongqi Wu ◽  
Jianwei Guo ◽  
Jun Xiao ◽  
Xiangyong Zeng ◽  
Ying Wang ◽  
...  
Keyword(s):  
Interactive Segmentation ◽  
Mechanical Models ◽  
Quadratic Surfaces

scholarly journals 3D-Based Transition hpq/hp-Adaptive Finite Elements for Analysis of Piezoelectrics

2021 ◽  
Vol 11 (9) ◽  
pp. 4062
Author(s):  
Grzegorz Zboiński ◽  
Magdalena Zielińska
Keyword(s):  
Finite Elements ◽  
Numerical Solutions ◽  
High Stress ◽  
Continuous Change ◽  
Transition Elements ◽  
Finite Element Approximations ◽  
Element Size ◽  
Piezoelectric Elements ◽  
Mechanical Models ◽  
Transition Models

This paper concerns the algorithm of transition piezoelectric elements for adaptive analysis of electro-mechanical systems. In addition, effectivity of the proposed elements in such an analysis is presented. The elements under consideration are assigned for joining basic elements which correspond to the mechanical models of either the first or higher order, while the electric model is of arbitrary order. In this work, three variants of the transition models are applied. The first one assures continuity of displacements between the basic models and continuity of electric potential between these models, as well. The second transition piezoelectric model guarantees additional continuity of the stress field between the basic models. The third transition model additionally enables continuous change of the strain state between the basic models. Based on the mentioned models, three types of the corresponding transition finite elements are introduced. The applied finite element approximations are hpq/hp-adaptive ones, which allows element-wise changes of the element size parameter h, and the element longitudinal and transverse orders of approximation, respectively, p and q, depending on the error level. Numerical effectiveness of the models and their approximations is investigated in the contexts of: ability to remove high stress gradients between the basic and transition models, and convergence of the numerical solutions for the model problems of piezoelectrics with and without the proposed transition elements.

scholarly journals A critical look at the prediction of the temperature field around a laser-induced melt pool on metallic substrates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yi Shu ◽  
Daniel Galles ◽  
Ottman A. Tertuliano ◽  
Brandon A. McWilliams ◽  
Nancy Yang ◽  
...  
Keyword(s):  
Laser Beam ◽  
Constant Velocity ◽  
Three Dimensional ◽  
Laser Beams ◽  
Poor Control ◽  
Metallic Substrates ◽  
Melt Pool ◽  
Mechanical Models ◽  
Transport Effects ◽  
Thermal Histories

AbstractThe study of microstructure evolution in additive manufacturing of metals would be aided by knowing the thermal history. Since temperature measurements beneath the surface are difficult, estimates are obtained from computational thermo-mechanical models calibrated against traces left in the sample revealed after etching, such as the trace of the melt pool boundary. Here we examine the question of how reliable thermal histories computed from a model that reproduces the melt pool trace are. To this end, we perform experiments in which one of two different laser beams moves with constant velocity and power over a substrate of 17-4PH SS or Ti-6Al-4V, with low enough power to avoid generating a keyhole. We find that thermal histories appear to be reliably computed provided that (a) the power density distribution of the laser beam over the substrate is well characterized, and (b) convective heat transport effects are accounted for. Poor control of the laser beam leads to potentially multiple three-dimensional melt pool shapes compatible with the melt pool trace, and therefore to multiple potential thermal histories. Ignoring convective effects leads to results that are inconsistent with experiments, even for the mild melt pools here.

scholarly journals A model order reduction approach to create patient-specific mechanical models of human liver in computational medicine applications

2019 ◽  
Vol 170 ◽  
pp. 95-106 ◽  
Author(s):  
Nathan Lauzeral ◽  
Domenico Borzacchiello ◽  
Michael Kugler ◽  
Daniel George ◽  
Yves Rémond ◽  
...  
Keyword(s):  
Human Liver ◽  
Model Order Reduction ◽  
Order Reduction ◽  
Patient Specific ◽  
Model Order ◽  
Mechanical Models ◽  
Reduction Approach

scholarly journals Material Parameter Identification for Acoustic Simulation of Additively Manufactured Structures

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 168
Author(s):  
Sebastian Rothe ◽  
Christopher Blech ◽  
Hagen Watschke ◽  
Thomas Vietor ◽  
Sabine C. Langer
Keyword(s):  
Krylov Subspace ◽  
Mechanical Impedance ◽  
Element Model ◽  
Material Parameter Identification ◽  
Material Parameters ◽  
Material Deposition ◽  
Mechanical Models ◽  
Acoustic Black Holes ◽  
Full Design ◽  
Design Freedom

One possibility in order to manufacture products with very few restrictions in design freedom is additive manufacturing. For advanced acoustic design measures like Acoustic Black Holes (ABH), the layer-wise material deposition allows the continuous alignment of the mechanical impedance by different filling patterns and degrees of filling. In order to explore the full design potential, mechanical models are indispensable. In dependency on process parameters, the resulting homogenized material parameters vary. In previous investigations, especially for ABH structures, a dependency of the material parameters on the structure’s thickness can be observed. In this contribution, beams of different thicknesses are investigated experimentally and numerically in order to identify the material parameters in dependency on the frequency and the thickness. The focused material is polyactic acid (PLA). A parameter fitting is conducted by use of a 3D finite element model and it’s reduced version in a Krylov subspace. The results yield homogenized material parameters for the PLA stack as a function of frequency and thickness. An increasing Young’s modulus with increasing frequency and increasing thickness is observed. This observed effect has considerable influence and has not been considered so far. With the received parameters, more reliable results can be obtained.

Mechanical models of trishear-like folds

2002 ◽  
Vol 24 (2) ◽  
pp. 277-287 ◽  
Author(s):  
Kaj M. Johnson ◽  
Arvid M. Johnson
Keyword(s):  
Mechanical Models

scholarly journals Mechanical models of amplitude and frequency modulation

2005 ◽  
Vol 26 (3) ◽  
pp. 409-422 ◽  
Author(s):  
L Bellomonte ◽  
I Guastella ◽  
R M Sperandeo-Mineo
Keyword(s):  
Frequency Modulation ◽  
Mechanical Models ◽  
Amplitude And Frequency Modulation
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