A5100337312- Welding Techniques and Residual Stresses
- Advanced Welding Techniques Analysis
- Aluminum Alloy Microstructure Properties
- Microstructure and Mechanical Properties of Steels
- Aluminum Alloys Composites Properties
- Additive Manufacturing Materials and Processes
- Magnesium Alloys: Properties and Applications
- Metal and Thin Film Mechanics
- High Entropy Alloys Studies
- Fatigue and fracture mechanics
- Advanced materials and composites
- Metal Alloys Wear and Properties
- High-Temperature Coating Behaviors
- Nanomaterials and Printing Technologies
- Metallurgy and Material Forming
- Aerodynamics and Fluid Dynamics Research
- Non-Destructive Testing Techniques
- Metallurgical Processes and Thermodynamics
- Engineering Applied Research
- Advanced machining processes and optimization
- Nuclear Materials and Properties
- Surface Treatment and Residual Stress
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- High Temperature Alloys and Creep
- Advanced Sensor and Energy Harvesting Materials
Korea Electronics Technology Institute
2014-2025
Korea Institute of Industrial Technology
2015-2024
Hongik University
2021-2024
Hanyang University
2021-2023
Seoul National University
2017-2021
Inha University
2008-2018
Soonchunhyang University
2018
Kwangwoon University
2016
Chungnam National University
2016
Seonam University
2015
Abstract A smooth, ultra-flexible and transparent electrode was developed from silver nanowires (AgNWs) embedded in a colorless polyimide (cPI) by utilizing an inverted film-processing method. The resulting AgNW-cPI composite had transparency of >80%, low sheet resistance 8 Ω/□ ultra-smooth surfaces comparable to glass. Leveraging the robust mechanical properties flexibility cPI, thickness film reduced less than 10 μm, which is conducive extreme flexibility. This exhibited durability, for...
Interatomic potentials for pure Li and the Mg–Li binary system have been developed based on second nearest-neighbor modified embedded-atom method formalism. The can describe various fundamental physical properties of (bulk, point defect, planar defect thermal properties) alloy behaviors (thermodynamic, structural elastic in reasonable agreement with experimental data or higher-level calculations. applicability potential to atomistic investigations deformation behavior Mg alloys effect is...
Stainless steel 316 (STS316)/Fe functionally graded materials were fabricated by direct energy deposition (DED) method using laser as a heat source. The feeding amount of the mixed powder was evaluated and condition optimized through section evaluation. reliability feed regression analysis, it confirmed dispersive spectrometer (EDS) analysis X-ray diffractometer (XRD) that functional material designed composition manufactured. Defects microstructures analyzed scanning electron microscope (SEM).
Finely patterned AgNW electrodes were embedded in a colorless polyimide, resulting flexible touch sensor.
Nondestructive test (NDT) technology is required in the gas metal arc (GMA) welding process to secure weld robustness and monitor quality real-time. In this study, a laser vision sensor (LVS) designed fabricated, an image processing algorithm developed implemented extract precise lines on tested welds. A camera calibration method based gyro used cope with complex motion of robot. Data are obtained GMA experiments at various conditions for estimation prediction models. Deep neural network...
Ultrasonic welding enables the bonding of materials with dissimilar thermal properties, making it a promising technology for industries requiring lightweight and high-strength components. This study investigates effects time on joint characteristics ultrasonic material between 6000-series aluminum alloy PA6-GF40 composite. In this study, tensile-shear tests were conducted to evaluate changes in energy strength under various conditions. The cross-sections observed using an optical microscope...
Ultrasonic welding technology is a joining method that utilizes localized frictional heat. Since the heat does not spread outside joint, it can efficiently join two materials while minimizing thermal damage to surrounding materials, making an advantageous process for dissimilar materials. In this study, effect of indentation on ultrasonic characteristics A1050 aluminum alloys and C1100 oxygen-free copper was investigated. The changes in energy, tensile shear strength, depth were observed as...
Resistance spot welding (RSW) inherently creates indentations on the material surface due to applied pressure from upper and lower electrodes. While are not a major concern for internal components, they significantly affect quality of external panels. To mitigate this issue, industrial practices involve increasing diameter curvature electrode tip; however, approach cannot completely eliminate indentations, necessitating additional post-processing their removal. Using large-area flat...
The influence of Ti addition on inclusion characteristics and their effects the nucleation acicular ferrite has been studied using as-deposited bainitic-type GMA weld metals prepared with oxygen content constant. TEM analysis was carried out to identify phases investigate local variation in chemical composition around inclusions. It found that Ti-containing phase changes from (Mn,Ti)-spinel oxide Ti2O3 at ~0.07 wt.% while Mn-depleted zone (MDZ) starts form ~0.02 Ti. This indicates MDZs are...
In this study, the effect of weld bead shape on fatigue strength lap fillet joints using gas metal arc welding (GMAW) process was investigated. The base material used in experiment 590 MPa grade galvanealed steel sheet with 2.3 mm and 2.6 thickness. order to make four types beads different shapes by factors such as length, angle, area, process, wire feeding speed, joint were changed. stress-number cycles failure (S–N) curve obtained from test for bead, cause difference clarified through...
An efficient nondestructive testing method of resistance spot weld quality is essential in evaluating the all welded joints automotive components a car body production line. This study proposes prediction algorithm for welding that can predict geometrical and physical properties spot-welded joint evaluate based on acceptance criteria. To this end, four statistical models main joint, including tensile shear strength, indentation depth, expulsion occurrence, failure mode, were estimated...