Modelling and optimization of weld bead geometry in robotic gas metal arc-based additive manufacturing using machine learning, finite-element modelling and graph theory and matrix approach

2022 ◽  
Author(s):  
K. Venkata Rao ◽  
Satish Parimi ◽  
L. Suvarna Raju ◽  
Gamini Suresh
Keyword(s):  
Machine Learning ◽  
Finite Element ◽  
Graph Theory ◽  
Additive Manufacturing ◽  
Finite Element Modelling ◽  
Bead Geometry ◽  
Matrix Approach ◽  
Weld Bead Geometry ◽  
Element Modelling ◽  
Modelling And Optimization

scholarly journals Size Effects in Finite Element Modelling of 3D Printed Bone Scaffolds Using Hydroxyapatite PEOT/PBT Composites

Mathematics ◽  
2021 ◽  
Vol 9 (15) ◽  
pp. 1746
Author(s):  
Iñigo Calderon-Uriszar-Aldaca ◽  
Sergio Perez ◽  
Ravi Sinha ◽  
Maria Camara-Torres ◽  
Sara Villanueva ◽  
...  
Keyword(s):  
Finite Element ◽  
Additive Manufacturing ◽  
Tissue Regeneration ◽  
Finite Element Modelling ◽  
Bulk Material ◽  
Bone Tissue Regeneration ◽  
Patient Specific ◽  
Design Factor ◽  
Element Modelling ◽  
Uncertainty Sources

Additive manufacturing (AM) of scaffolds enables the fabrication of customized patient-specific implants for tissue regeneration. Scaffold customization does not involve only the macroscale shape of the final implant, but also their microscopic pore geometry and material properties, which are dependent on optimizable topology. A good match between the experimental data of AM scaffolds and the models is obtained when there is just a few millimetres at least in one direction. Here, we describe a methodology to perform finite element modelling on AM scaffolds for bone tissue regeneration with clinically relevant dimensions (i.e., volume > 1 cm3). The simulation used an equivalent cubic eight node finite elements mesh, and the materials properties were derived both empirically and numerically, from bulk material direct testing and simulated tests on scaffolds. The experimental validation was performed using poly(ethylene oxide terephthalate)-poly(butylene terephthalate) (PEOT/PBT) copolymers and 45 wt% nano hydroxyapatite fillers composites. By applying this methodology on three separate scaffold architectures with volumes larger than 1 cm3, the simulations overestimated the scaffold performance, resulting in 150–290% stiffer than average values obtained in the validation tests. The results mismatch highlighted the relevance of the lack of printing accuracy that is characteristic of the additive manufacturing process. Accordingly, a sensitivity analysis was performed on nine detected uncertainty sources, studying their influence. After the definition of acceptable execution tolerances and reliability levels, a design factor was defined to calibrate the methodology under expectable and conservative scenarios.

Banded matrix approach to Finite Element modelling for soft tissue simulation

1999 ◽  
Vol 4 (3) ◽  
pp. 203-212 ◽  
Author(s):  
J. Berkley ◽  
S. Weghorst ◽  
H. Gladstone ◽  
G. Raugi ◽  
D. Berg ◽  
...  
Keyword(s):  
Finite Element ◽  
Soft Tissue ◽  
Finite Element Modelling ◽  
Matrix Approach ◽  
Element Modelling ◽  
Banded Matrix

scholarly journals Finite Element Modelling of Wire-arc-additive-manufacturing Process

Procedia CIRP ◽  
2016 ◽  
Vol 55 ◽  
pp. 109-114 ◽  
Author(s):  
Filippo Montevecchi ◽  
Giuseppe Venturini ◽  
Antonio Scippa ◽  
Gianni Campatelli
Keyword(s):  
Finite Element ◽  
Additive Manufacturing ◽  
Manufacturing Process ◽  
Finite Element Modelling ◽  
Element Modelling ◽  
Wire Arc Additive Manufacturing

scholarly journals Finite element modelling and optimization of Ge/SiGe superlattice based thermoelectric generators

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Ameze Big-Alabo
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Output Voltage ◽  
Methodological Approach ◽  
Operating Conditions ◽  
Thermoelectric Generators ◽  
Voltage Distribution ◽  
Governing Equations ◽  
Element Modelling ◽  
Modelling And Optimization

AbstractThe study presents the development of a 3D Finite Element modelling (FEM) technique for a uni-coupled Ge/SiGe superlattice-based module configuration. The methodological approach involved the development of the geometrical design of the Ge/SiGe – based Thermoelectric generator (TEG), defining the thermoelectric material properties and boundary conditions and then implementation of the governing equations to obtain an approximate solution via meshing of the TEG module. The developed FEM was then used to optimize the geometry of the TEG with the aim of reducing the contact resistance for improved performances. One way to achieve this is to reduce the thickness of the silicon substrate. Thus by reducing the thickness of the substrate, the thermal losses in the system will be minimized. Secondly, by increasing the superlattice heights, the output voltage also increased and given the anisotropic nature of the superlattice, it was inferred that the optimal voltage measurements can be obtained at the surface of the superlattice which yields the maximum leg height. The relevance of this study is that the FEM allows the simulation of the TEG module for different real-world conditions that would otherwise be expensive and time-consuming to investigate experimentally. It also gives insight to the temperature and voltage distribution of the TEG module under varying operating conditions.

scholarly journals New Manufacturing Process and Product Developments in Metal Forming Industry Using Finite Element Modelling and Optimization Techniques

2021 ◽  
Author(s):  
Van Bac Nguyen ◽  
Martin English
Keyword(s):  
Finite Element ◽  
Numerical Modelling ◽  
Manufacturing Process ◽  
Finite Element Modelling ◽  
Optimization Techniques ◽  
Roll Forming ◽  
Cold Roll Forming ◽  
Element Modelling ◽  
Cold Roll ◽  
Modelling And Optimization

The objective of this paper is to outline a practical approach using numerical modelling and optimization techniques for process and product developments in metal cold rolled forming industry. The optimum economic viability in manufacturing industry requires a minimization of the amount of material used while the structural performance of a cold roll formed product relies on maintaining the stiffness and strength of the section in applications. This leads to the development of new cold forming processes and alternative cold roll formed profiles searching for the optimal profile. In this paper, a Finite Element modelling approach was utilized to simulating complicated manufacturing process and products and optimization techniques including Design Of Experiments was used to optimize the shape design of the end products to obtain lighter products while maintaining the product strength. These developments were illustrated through two case studies of Hadley Industries plc which included (1) numerical modelling of a novel Ultra STEEL® cold roll forming process, and (2) optimization of cold roll forming sections.

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