Eulerian Modeling of Plasma-Pressure Driven Laser Impact Weld Processes
| Autor: | Sepehr Sadeh, Arif S. Malik, Glenn Gleason, Sumair Sunny, Haoliang Yu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Materials science Atmospheric-pressure plasma Eulerian path 02 engineering and technology Welding Mechanics Industrial and Manufacturing Engineering Control volume law.invention symbols.namesake 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering Shear (geology) Artificial Intelligence law Heat generation Shear stress symbols FOIL method |
| Zdroj: | Procedia Manufacturing. 48:204-214 |
| ISSN: | 2351-9789 |
| DOI: | 10.1016/j.promfg.2020.05.039 |
| Popis: | In this study, details of the rapidly evolving state of a laser impact welding (LIW) process are simulated by incorporating a hydrodynamic plasma pressure model into a high-fidelity thermomechanical Eulerian numerical approach. Detailed evolution of the localized velocities, shear stresses, plastic strains, and temperature state in the vicinity of the weld interface during its formation are revealed. The presented simulation technique applies a load distribution that is temporally and spatially modeled based on the plasma pressure induced during surface ablation by a nanosecond-pulsed infrared laser. Due to the Gaussian plasma-pressure loading profile, significant shear stress patterns are observed to develop in the flyer foil prior to its collision with the target foil, the character of which appears to be significant in achieving a successful impact weld. Moreover, features already known to be critical to successful impact welding of thin foils are captured by the combination of the high-fidelity Eulerian control volume and the plasma pressure model, including the requisite collision velocity and impact angle. During the impact welding, interfacial material ‘jetting’ is observed, in addition to concentrated shear stress fields along the weld front. A wavy interface arising from a regular pattern of material mixing is confirmed to occur, in addition to significant plastic strains and heat generation due to the plastic deformation, all of which indicate the formation of a collision joint due to the more realistic loading condition imposed. |
| Databáze: | OpenAIRE |
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