Accelerated Process Parameter Selection of Polymer-based Selective Laser Sintering via Hybrid Physics-informed Neural Network and Finite Element Surrogate Modelling

Applied Mathematical Modelling, Journal Year: 2024, Volume and Issue: 130, P. 693 - 712

Published: March 28, 2024

The state of the melt region as well temperature field are critical indicators reflecting stability process and subsequent product quality in selective laser sintering (SLS). present study compares various simulation models for analyzing pool morphologies, specifically considering their complex transient evolution. While thermal fluid dynamic simulations offer comprehensive insights into regions, inherent high computational time demand is a drawback. In SLS, polymer's viscosity low conductivity limit liquid flow, thereby promoting slow evolution formation. Based on this observation, utilizing low-complexity pure heat conduction can be adequate describing morphologies compared to more simulations. work, we propose such purely based finite element (FE) model use it combination with an AI-powered partial differential equation (PDE) solver parametric physics-informed neural network (PINN). We conduct process, where large gradients present, PINN model, whereas employ method (FEM) cooling phase which rates several orders lower, thus enabling prediction morphology under configurations. combined hybrid demonstrates less than 7% deviation temperatures 1% sizes FEM-based models, faster times 0.7 s 20 minutes cooling. Moreover, utilized multi-track variations purpose optimizing manufacturing process. Our provides approach determine most suitable combinations settings that enhance speed while preventing issues lack fusion material degradation.

Language: Английский

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A novel design strategy to enhance buckling resistance of thin-walled single-cell lattice structures via topology optimisation

Virtual and Physical Prototyping, Journal Year: 2024, Volume and Issue: 19(1)

Published: May 6, 2024

Lattice structures with thin walls or members are susceptible to instability due their limited buckling strength. We propose a design methodology that utilises topology optimisation techniques create lattice structure improved resistance, demonstrated here on single cell of thin-walled square honeycomb lattice. utilise the mode as reference inform modified via optimisation, while ensuring weight and stiffness remain unchanged. apply 2D method objective maximising load factors, simultaneously enforcing constraints volume fraction within domain. A family designs is created parametric study, considering parameters like thickness member active Designing fabricating these also consider additive manufacturing constraints, such minimal feature size overhang. Experimental analysis fabricated reveals remarkable 70% increase in strength without altering weight. Numerical simulations corroborate findings, discrepancy less than 10%. This shows potential enhance resistance lattices various types maintaining base stiffness.

Language: Английский

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A double-layer mesh-driven robust topology optimization strategy for mechanical metamaterials under size uncertainty

Thin-Walled Structures, Journal Year: 2023, Volume and Issue: 196, P. 111439 - 111439

Published: Dec. 7, 2023

Language: Английский

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Natural frequency analysis of bidirectional functionally graded plates based on a refined shear theory using nonconforming finite elements

Mechanics of Advanced Materials and Structures, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 12

Published: Jan. 23, 2024

In this study, we investigate the free vibrations of functionally graded plates using refined shear deformation theory. These have material properties that vary in two directions: z-axis and x-axis. The variation follows a bidirectional gradation described by power law based on Voigt rule mixture. displacement field is characterized four variables, chosen such way strain stress vanish, traction at upper lower surfaces plate. This eliminates need for correction factor, as required first-order We derive equations motion related boundary conditions Hamilton's principle finite element approach. proposed ensures C1-continuity including first derivative transverse deflection kinematic field. For spatial discretization, employ rectangular with nodes interpolation schemes. Lagrangian shape functions are used in-plane displacement, while Hermitian scheme employed deflection. enables us to determine natural frequencies 2D-FG plates. demonstrate validity, convergence, accuracy through illustrative examples compare it previous literature. Furthermore, conduct numerical analyses examine effects function, conditions, plate aspect ratio, slenderness indices frequencies. developed model provides insights into significance design various structural elements,

Language: Английский

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Avoiding heat source calibration for finite element modeling of the laser powder bed fusion process

Additive manufacturing, Journal Year: 2024, Volume and Issue: 92, P. 104369 - 104369

Published: July 1, 2024

Language: Английский

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