The Effects of Ablative Coating Thickness at Various Laser Intensities and Multiple Laser Pulses on Thin Copper Sheet Formability in High Strain Rate Laser Shock Forming

2011 ◽  
Author(s):  
Balasubramanian Nagarajan ◽  
Sylvie Castagne ◽  
Zhongke Wang ◽  
Choon Keat Lai ◽  
Xincai Wang ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Coating Thickness ◽  
High Strain ◽  
Laser Pulses ◽  
Laser Shock ◽  
Copper Sheet ◽  
Sheet Formability ◽  
Laser Shock Forming

Characterizations on Microscale Laser Dynamic Forming of Metal Foil

2006 ◽  
Author(s):  
Gary J. Cheng ◽  
Daniel Pirzada
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Electron Backscatter Diffraction ◽  
Laser Forming ◽  
Metal Foil ◽  
Laser Shock ◽  
Forming Process ◽  
High Shock ◽  
Shock Peening

Laser dynamic forming (LDF) is a unique hybrid forming process, combining the advantages of laser shock peening, laser forming and metal forming, with an ultra high strain rate forming utilizing laser shock waves. In this paper, a hybrid forming technique based on laser dynamic forming will be demonstrated. The feasibility of laser dynamic forming will be discussed through experiments. The mechanical and microstructure of the formed 3D structures will be characterized. The grain microstructure and misorientation will be investigated quantitatively with Electron backscatter diffraction (EBSD). The residual stress distributions are measured using X-ray diffraction. We will describe the important factors that lead to improved micro-formability at high strain rate induced by high shock pressure. It is concluded that with further development, this may be an important microforming technology for various materials. LDF has great potential for meso-, micro- and nano scale forming since the laser provides high precision, highly-localized heating intensity, high repeatability, fast setup and superb flexibility.

Investigation of laser shock induced ductile damage at ultra-high strain rate by using large scale MD simulations

2012 ◽  
Author(s):  
Jean-Paul Cuq-Lelandais ◽  
Michel Boustie ◽  
Laurent Soulard ◽  
Laurent Berthe ◽  
Joelle Bontaz-Carion ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Large Scale ◽  
High Strain ◽  
Md Simulations ◽  
Ductile Damage ◽  
Laser Shock

Numerical Simulation of Laser Shock Peening in Presence of Weld for Fatigue Life Design

2014 ◽  
Author(s):  
Emricka Julan ◽  
Said Taheri ◽  
Claude Stolz ◽  
Patrice Peyre ◽  
Philippe Gilles
Keyword(s):  
Numerical Simulation ◽  
Stress Field ◽  
Residual Stresses ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Laser Shock Peening ◽  
Initial Stresses ◽  
Laser Shock ◽  
Shock Peening

Laser shock peening (LSP) is a surface mitigation technique that can be applied to improve the life of a metallic component through the generation of a compressive surface stress field induced by high-power laser pulses. Numerical simulation of LSP (produced residual stresses) in presence of an initial stress field similar to those obtained under welding has been carried out in nonlinear dynamic by coupling an explicit code (Europlexus) and an implicit one (Code_Aster). In the first step, an axisymetrical model has been validated by comparison with an analytical solution considering an elastic-perfectly plastic behavior law. Then, comparisons with Abaqus calculations have been carried out in terms of displacements and residual stresses using the Johnson-Cook high strain rate constitutive law to validate multi-impact 3D modeling. High strain rate parameter of Johnson-Cook law has been identified using LSP on thin plates. Validations of the simulations are then performed by comparing with experimental determined deformations caused by LSP on thick plates. For 25 overlapped shots, LSP induced residual stresses calculated with and without initial residual stresses similar to those obtain under welding have been compared to adress the effect of initial stresses on final residual fields.

Study of high strain rate effect on sheet formability based on Nakazima test

2017 ◽  
Author(s):  
Edoardo Mancini ◽  
Gianluca Chiappini ◽  
Archimede Forcellese ◽  
Marco Sasso ◽  
Michela Simoncini
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Sheet Formability
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