Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Chang-Whan Lee"'
Autor:
Yun-Chan Chung, Jae-Hyeong Yu, Kyu-Seok Jung, Yong-Ho Song, Young-Bae Jun, Young-Jae Kim, Sung-Min Jun, Sung-Oh Kwon, Chang-Whan Lee
Publikováno v:
Heliyon, Vol 9, Iss 4, Pp e14757- (2023)
The subtle feature geometry also called a feature line, is considered an important geometric characteristic of automotive outer panels. The influences of material properties and thickness on the radius of curvature of subtle features were investigate
Externí odkaz:
https://doaj.org/article/1048fce7a9154d63925b5795a98bf644
Publikováno v:
Materials, Vol 16, Iss 15, p 5308 (2023)
The uniaxial warm tensile experiments were carried out in deformation temperatures (50–250 °C) and strain rates (0.005 to 0.0167 s−1) to investigate the material workability and to predict flow stress of AZ31B magnesium alloy. The back–propaga
Externí odkaz:
https://doaj.org/article/f222cf6bf9f741428420bbecc616183a
Publikováno v:
Materials, Vol 16, Iss 14, p 5088 (2023)
Constitutive equations were recognized for AZ31B magnesium alloy at higher temperatures and strain rates from conventional empirical models like the original Johnson–Cook (JC), modified JC, and modified Zerilli–Armstrong (ZA) models for capturing
Externí odkaz:
https://doaj.org/article/e24165f3d98f405f81a092fe2a38261d
Publikováno v:
Energies, Vol 16, Iss 6, p 2700 (2023)
Molten carbonate fuel cells (MCFCs) use molten carbonate as an electrolyte. MCFCs operate at high temperatures and have the advantage of using methane as a fuel because they can use nickel-based catalysts. We analyzed the performance of an internal m
Externí odkaz:
https://doaj.org/article/5b2b6dc4ea874d99a2a6fa43fe3816a6
Autor:
Chang-Whan Lee, Yun-Chan Chung
Publikováno v:
Materials, Vol 15, Iss 18, p 6323 (2022)
Feature lines on automotive outer panels are difficult to make, measure, and inspect. This paper proposes an algorithm to fit a line-arc-line curve to the measured data points of a subtle feature line. First, based on an iterative method and random s
Externí odkaz:
https://doaj.org/article/21e9dfb5271c4f3d8b8b25458a807a72
Autor:
Mohanraj Murugesan, Jae-Hyeong Yu, Kyu-Seok Jung, Sung-Min Cho, Krishna Singh Bhandari, Chang-Whan Lee
Publikováno v:
Materials, Vol 15, Iss 4, p 1458 (2022)
The surface finish is an important characteristic in the incremental sheet forming (ISF) process and is often influenced by numerous factors within the forming process. Therefore, this research was aimed at identifying the optimal forming parameters
Externí odkaz:
https://doaj.org/article/6be679e666a24447a5a118f5716dda3e
Publikováno v:
Energies, Vol 14, Iss 16, p 5156 (2021)
The free-piston Stirling engine is a closed-cycle regenerative heat engine that converts heat energy into mechanical work, and requires a spring element for vibratory operations of the displacer and power pistons. In this study, the geometry of the f
Externí odkaz:
https://doaj.org/article/bb4cb5c61cf84f43b8d69002fcaecd0a
Autor:
Jae-Hyeong YU, Chang-Whan Lee
Publikováno v:
Materials, Vol 14, Iss 14, p 3856 (2021)
In this study, the time-dependent mechanical behavior of the magnesium alloy sheet (AZ31B) was investigated through the creep and stress relaxation tests with respect to the temperature and pre-strain. The microstructure changes during creep and stre
Externí odkaz:
https://doaj.org/article/fb6cc9f8278c4f478d0546a165e09f46
Publikováno v:
Materials, Vol 13, Iss 21, p 4719 (2020)
Incremental sheet metal forming can manufacture various sheet metal products without a dedicated punch and die set. In this study, we developed a two-stage incremental forming process to decrease shape errors in the conventional incremental forming p
Externí odkaz:
https://doaj.org/article/d21f56929e7249188dc9a477b7da7915
Autor:
Jae-Hyeong Yu, Chang-Whan Lee
Publikováno v:
Energies, Vol 13, Iss 6, p 1361 (2020)
Molten carbonate fuel cells (MCFCs) are high-operating-temperature fuel cells with high efficiency and fuel diversity. Electrochemical reactions in MCFCs are exothermic. As the size of the fuel cells increases, the amount of the heat from the fuel ce
Externí odkaz:
https://doaj.org/article/f09a71d10d5e453aa74792c8d9a90c5b