Investigation of Collision Toughness and Energy Distribution for Hot Press Forming Center Pillar Applied with Combination Techniques of Patchwork and Partial Softening Using Side Crash Simulation
2. Experiment and Simulation
2.2. Drop Weight Test and Simulation
2.2.1. Geometry Modeling, Mesh, and Weld Constraints for FE Simulation
2.2.2. Boundary Conditions for Drop Weight Test
2.3. Side Crash Simulation
2.3.1. Geometry and Properties of a Moving Deformable Barrier in a Sedan
2.3.2. Boundary Conditions for Side Crash Test
2.3.3. Energy Absorption Method
2.3.4. Damage Initiation Criteria and Damage Evolution
3. Results and Discussion
3.1. Comparison of Impulse between Experiment and Simulation
3.2. Side Crash Simulation
3.2.1. Energy Distribution during Side Crash Simulation
3.2.2. Effect of PW and PS on Elastic Strain Energy
3.2.3. Effect of PW and PS on Plastic Dissipated Energy
3.2.4. Effect of PW and PS on Internal Energy
3.2.5. Effect of PW and PS on the Intrusion Resistance
- During a side crash collision, the effect of PW in the HPF center pillar on plastic deformation energy was minimal but important with respect to elastic strain energy and intrusion resistance. When PW was applied to the HPF center pillar to strengthen the stiffness, the elastic strain energy and intrusion displacement were 10.0 and 7.5% respectively.
- Because the PS technique provided ductility to the lower region of the HPF center pillar, large deformation occurred, and the plastic deformation energy was improved significantly by 10%. The plastic deformation energy of the PS region accounted for 49.8~50.9% of the plastic deformation energy of the HPF center pillar with PS.
- In terms of total internal energy, the PS technique achieved better results than the PW technique. The maximum intrusion displacement of the HPF center pillar with PS was similar to that of the HPF center pillar with PW. In the case of the HPF center pillar with PW and PS, the maximum intrusion displacement was improved by 13.4%, and a synergistic effect of PW and PS occurred.
Data Availability Statement
Conflicts of Interest
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|Attachment Method||Additional Mass (kg)||Spot Radius (mm)||Degrees of Freedom|
between Front Bumper Beam and Impactor
between Ground and Vehicle
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Lee, M.S.; Jin, C.K.; Suh, J.; Lee, T.; Lim, O.D. Investigation of Collision Toughness and Energy Distribution for Hot Press Forming Center Pillar Applied with Combination Techniques of Patchwork and Partial Softening Using Side Crash Simulation. Metals 2022, 12, 1941. https://doi.org/10.3390/met12111941
Lee MS, Jin CK, Suh J, Lee T, Lim OD. Investigation of Collision Toughness and Energy Distribution for Hot Press Forming Center Pillar Applied with Combination Techniques of Patchwork and Partial Softening Using Side Crash Simulation. Metals. 2022; 12(11):1941. https://doi.org/10.3390/met12111941Chicago/Turabian Style
Lee, Min Sik, Chul Kyu Jin, Junho Suh, Taekyung Lee, and Ok Dong Lim. 2022. "Investigation of Collision Toughness and Energy Distribution for Hot Press Forming Center Pillar Applied with Combination Techniques of Patchwork and Partial Softening Using Side Crash Simulation" Metals 12, no. 11: 1941. https://doi.org/10.3390/met12111941