3D microscale laser dynamic forming: Multiscale modeling and experimental validation
Microscale laser dynamic forming ({mu}LDF) shows great potential in fabricating robust and high-aspect-ratio metallic microcomponents. Experiments revealed that strain rate and sample size play important roles in determining the dynamic plasticity and final results of {mu}LDF. To further understand these effects, a multiscale modeling methodology is adopted to characterize the microscale dynamic plasticity considering the evolutions of nano-to-submicron dislocations avalanches under shock loading. In this methodology, 3D discrete dislocation dynamics simulations are implemented to derive the yield strength and the initial strain hardening dependence on size and strain rate. It is observed that there exist three dynamic stages during deformation process. The initial strain hardening rate in Stage II increases with strain rate. The mechanical threshold stress model, intrinsically equipped with strain-rate-dependent flow stress and initial hardening, is chosen and modified to incorporate size effect quantitatively. This scale-dependent model, implemented in abaqus/explicit, provides deformation depths and thickness variations in good agreement with experimental results in {mu}LDF.
- OSTI ID:
- 21560259
- Journal Information:
- Journal of Applied Physics, Vol. 109, Issue 10; Other Information: DOI: 10.1063/1.3590144; (c) 2011 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASPECT RATIO
DEFORMATION
DISLOCATIONS
FLOW STRESS
LASER MATERIALS
LOADING
PLASTICITY
PLASTICS
PROCESSING
SHOCK WAVES
SIMULATION
STRAIN HARDENING
STRAIN RATE
THICKNESS
YIELD STRENGTH
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIMENSIONLESS NUMBERS
DIMENSIONS
HARDENING
LINE DEFECTS
MATERIALS
MATERIALS HANDLING
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
STRESSES
SYNTHETIC MATERIALS