Silvaco Inc’s Post

For the first time, a distinct application of polarization singularities in #laser #microprocessing demonstrated! "Polarization singularities provide a unique ability to dynamically shape vector beams using the design of geometric phase elements (GPEs) proposed in this work and based on hollow center space variant #waveplates.  ... The produced GPEs were successfully used to generate high-energy polarization singularities and these were employed in #glasswelding, #thinfilm removal, and #silicon #ablation applications.  The experimental results demonstrate the significant impact of the shape of the beam on the material processing results.  Polarization singularities with tunable #FlatTop beam profiles offer enhanced control over heat deposition and material modification, enabling the production of more precise and uniform structures compared to Gaussian beams. These findings underscore the potential of flat-top beams in various material processing applications, including #volume #modification of transparent materials and selective #surface #ablation of thin metallic films, as well as for #semiconductors." The article - Polarization singularities for shaping of vector flat-top beams in utilization for high-power laser micromachining of various materials - was published in Optics & Laser Technology, Volume 177, 2024. The authors: Ernestas Nacius, Orestas Ulčinas, Sergej Orlov, Vytautas Jukna.

Simulating 20 Layers of Maraging Steel with LPBF Using AM PravaH In this video, we explore a detailed simulation of 20 layers in the Laser Powder Bed Fusion (LPBF) process for Maraging steel alloy, using AM PravaH software. Watch as we delve into the intricate layer-by-layer manufacturing of a thin metal wall, capturing every phase of the process. We also showcase how phase changes are tracked, Gaussian laser distribution with Fresnel reflections is calculated, and Marangoni convection and Discrete Element Method (DEM) are applied for precise powder bed preparation (with particles sized between 18-36 microns). This sophisticated simulation was executed on a powerful 20-core processor and completed in under a day, thanks to advanced preventive time step controls. #additivemanufacturing #3dprinting #3dmodeling #engineering #innovation

FEM of the month This month we’re diving into an explosion simulation inside a standard 20-foot shipping container. The TNT explosion is simulated using the blast load functionality in Altair Radioss. The goal is to demonstrate how Radioss can be used to predict the effect of an explosion on a structure. The software provides 3 different types of explosions: · Free Air · Ground Reflection · Air Burst The setup simplifies the air blast pressure calculation because the arrival time and incident pressure are not adjusted for obstacles. Confinement of the explosion and ground effects are also neglected. A free air explosion without ground reflection is used for the current simulation. The air blast pressure is determined by the software using the semi-empirical (modified) Friedlander model, which has been determined by fitting to experimental data. Only the detonation point, affected surfaces and equivalent TNT mass must be provided to set-up the simulation. The air blast pressure used in the simulation is equivalent to that of a one-kilogram TNT explosion.   An elastic-plastic material model with failure is used to model the behaviour of the Corten steel (common for shipping containers) of the container. 3D shell elements and 1D beam elements are used to model the container. The bottom of the container is constrained in the vertical direction. The video shows the deformation of the container as well as the blast pressure on the container walls. #fem #explosion #simulation #engineering #femto #weenableinnovation

This simulation is based on 1 KG NEQ of TNT equivalent. A 20’ TEU can carry exponentially more than that quantity. Not to mention this is only the effect of blast and does not take fragmentation into account. Sea containers [alone] are neither magazines nor barricades, yet I have seen them used as both.

While most of our LinkedIn feed is full of #PhotonicsWest activity, we’re working hard to release some exciting new products! Stay tuned for the release of ALLVAR Alloys SM1 Lens Tubes, engineered with our unique negative CTE material. These lens tubes bring a new level of precision and compatibility to your projects, designed to seamlessly fit with standard SM1 threaded style lens tubes. Ideal for breadboard assembly and prototyping, they're a game-changer in helping you tackle thermal design challenges in optical assemblies! 👀 Keep an eye on our LinkedIn for updates. 📧 Sign up for our newsletter to get all the details first: https://ow.ly/n3Vu50QwvLC #AllvarAlloys #Optics #Photonics #Assembly #OpticalDesign #OptoMechanicalEngineering #Engineering

#mdpimetals #highlycited 📌Highly cited paper sharing: Title: Geometry Effect on Microstructure and Mechanical Properties in Laser Powder Bed Fusion of Ti-6Al-4V by Juri Munk, Eric Breitbarth, Tobias Siemer, Norbert Pirch and Constantin Häfner Highlights: * The effect of geometry on the material properties of LPBF-made parts from Ti-6Al-4V was investigated * Thermal histories of various geometries were simulated by transient thermal finite element analysis of the LPBF process * Geometry variants with areas exposed to impeded heat dissipation and therefore higher local thermal input show an 𝛼 + 𝛽 microstructure with a 𝛽 fraction of up to 20% compared to the common 𝛼′ microstructure in areas not exposed to excessive thermal input * Based on data from 21 different geometry variants, a correlation model between tensile strength and simulated thermal histories was successfully established * The achieved results provide the basis for a rapid prediction model of the mechanical performance of additively manufactured components The full text of the paper can be viewed and downloaded for free at: https://brnw.ch/21wKY2K #additivemanufacturing #laserpowderbedfusion #heattreatment

In this video we will investigate the situation where two adjacent rigid diaphragm panels may constrain the same joint, and cause an FYI CO108 Solver Diagnostic Message during analysis. We will look at how we can prevent this by removing the shared joints from one or more of the rigid diaphragm constraints. Know more: https://lnkd.in/g4HYS_fZ #altair #onlyforward #altairpatner #cae #simsolid #simlab #design #simulate #multiphysics #optimization Abhijit kulkarni Dr. LAXMINARAYAN KRISHNAPPA Amar Javalekar Altair

In this video we will investigate the situation where two adjacent rigid diaphragm panels may constrain the same joint, and cause an FYI CO108 Solver Diagnostic Message during analysis. We will look at how we can prevent this by removing the shared joints from one or more of the rigid diaphragm constraints. Know more: https://lnkd.in/g4HYS_fZ #altair #onlyforward #altairpatner #cae #simsolid #simlab #design #simulate #multiphysics #optimization Abhijit kulkarni Dr. LAXMINARAYAN KRISHNAPPA Amar Javalekar Altair

In this video we will investigate the situation where two adjacent rigid diaphragm panels may constrain the same joint, and cause an FYI CO108 Solver Diagnostic Message during analysis. We will look at how we can prevent this by removing the shared joints from one or more of the rigid diaphragm constraints. Know more: https://lnkd.in/g4HYS_fZ #altair #onlyforward #altairpatner #cae #simsolid #simlab #design #simulate #multiphysics #optimization Abhijit Kulkarni Dr. LAXMINARAYAN KRISHNAPPA Amar Javalekar Altair

In this video we will investigate the situation where two adjacent rigid diaphragm panels may constrain the same joint, and cause an FYI CO108 Solver Diagnostic Message during analysis. We will look at how we can prevent this by removing the shared joints from one or more of the rigid diaphragm constraints. Know more: https://lnkd.in/g4HYS_fZ #altair #onlyforward #altairpatner #cae #simsolid #simlab #design #simulate #multiphysics #optimization Abhijit kulkarni Dr. LAXMINARAYAN KRISHNAPPA Amar Javalekar Altair