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3차원 프린팅 금속의 제조 방식에 따른 기계적 거동 평가
김두형(Doohyeong Kim),이용석(Yong-Seok Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
It is important to understand a mechanical behavior of metals for retaining product reliability. The mechanical behavior of metals is influenced by various parameters. One of them, the material manufacturing method, has recently become in spotlight. In our research, we conducted an evaluation of mechanical characteristics according to different materials and two different manufacturing method, which were casting and additive manufacturing methods. There was an additional evaluated factor, a direction effect of the additive manufactured specimens. Tensile tests were performed on a total of seven different specimens. The proportional limit, ultimate tensile strength, and elongation were found for each sample, and we were analyzed for a reason of dissimilar mechanical behavior based on surface observation.
3차원 프린팅 금속의 제조 방식에 따른 기계적 거동 평가
김두형(Doohyeong Kim),이용석(Yong-Seok Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
It is important to understand a mechanical behavior of metals for retaining product reliability. The mechanical behavior of metals is influenced by various parameters. One of them, the material manufacturing method, has recently become in spotlight. In our research, we conducted an evaluation of mechanical characteristics according to different materials and two different manufacturing method, which were casting and additive manufacturing methods. There was an additional evaluated factor, a direction effect of the additive manufactured specimens. Tensile tests were performed on a total of seven different specimens. The proportional limit, ultimate tensile strength, and elongation were found for each sample, and we were analyzed for a reason of dissimilar mechanical behavior based on surface observation.
Sangyul Ha,박진형,Doohyeong Kim,Hyeon-Jin Son,Yong-Seok Lee 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
Various mechanical tests are performed to evaluate mechanical characteristics. Tensile testing is an essential experimental method. Preparing equipment for accurately measuring mechanical properties is challenging because it is very expensive. Hence, tensile tests are performed except for some measuring instruments. The strain-measurement device is often excluded. Therefore, the outcomes of strain measurement methods differ. This study showed the difference in the elastic modulus depending on that in the strain measurement method (strain calculation based on (1) the strain between the grips and (2) that using a strain gauge or other strain measurement devices in the gauge length). Experiments and computational analyses were used to prove the outcome. A novel method to estimate the elastic modulus through a hybrid experimental method and finite element analysis is proposed because the elastic modulus can be lowered when calculating strain based on the deformation amount between grips.
유한요소해석을 활용한 전자 패키지 휨에서 물성 산포의 영향 분석
박수빈(Soobean Park),김두형(Doohyeong Kim),하상렬(Sangyul Ha),이용석(Yong-Seok Lee) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Warpage behavior prediction is one of important skill in electronic packages. Currently, the prediction of warpage behavior is based on average values. In this study, we analyzed how the warpage changes when the mechanical property distribution is considered in the warpage behavior through finite element analysis. Based on the results, we will introduce the influence of mechanical property scatter and the important properties factors to control the warpage.
임무에 따른 하박 교체형 고 가반하중 양팔로봇의 설계: 구난 및 물체 핸들링
김휘수,박동일,최태용,도현민,김두형,경진호,박찬훈,Kim, Hwisu,Park, Dongil,Choi, Taeyong,Do, Hyunmin,Kim, Doohyeong,Kyung, Jinho,Park, Chanhun 한국로봇학회 2017 로봇학회 논문지 Vol.12 No.4
Robot arms are being increasingly used in various fields with special attention given to unmanned systems. In this research, we developed a high payload dual-arm robot, in which the forearm module is replaceable to meet the assigned task, such as object handling or lifting humans in a rescue operation. With each forearm module specialized for an assigned task (e.g. safety for rescue and redundant joints for object handling task), the robot can conduct various tasks more effectively than could be done previously. In this paper, the design of the high payload dual-arm robot with replaceable forearm function is described in detail. Two forearms are developed here. Each of forearm has quite a different goal. One of the forearms is specialized for human rescue in human familiar flat aspect and compliance parts. Other is for general heavy objects, more than 30 kg, handling with high degree of freedom more than 7.