The University of Osaka · Engineering
Ninshu Ma 교수의 연구실은 첨단 제조 공정과 스마트 재료를 중심으로 한 고성능 구조물의 설계 및 제어를 연구하고 있습니다. 특히 shape memory alloy 기반 액추에이터의 에너지 효율 향상, 와이어 및 아크 증착성 가공(WAAM)에서의 미세구조 제어, 그리고 박판 파이프 용접 시 변형과 잔류 응력 제어를 위한 외부 구속 기법 개발에 중점을 두고 있습니다. 실험, 수치 해석, 모델링을 융합한 다스케일 연구로, 항공우주 및 엔지니어링 구조물의 신뢰성 향상을 목표로 합니다.
Figures are computed from collected data and may differ slightly.
Shape memory alloys (SMA), in particular nickel–titanium alloy (or nitinol), have been used as actuators in some astronautic, aeronautic and industrial applications. The future will see more SMA application if less energy is required for actuation. This paper presents the design and experimental results of control of an SMA actuator using pulse width modulation (PWM) to reduce the energy consumption by the SMA actuator. A SMA wire test stand is used in this research. Open-loop testing of the SMA
Wire and Arc Additive Manufacturing (WAAM) is a combination of welding and AM technologies and uses an electric arc as the heat source to melt welding wire. The mechanical properties of WAAM components are greatly dependent on the solidification behavior and microstructure. In this paper, a model composed of a macroscopic finite element (FE) model combined with a microscopic phase field (PF) model was constructed to investigate the Al alloy microstructure evolution during WAAM. First, the FE mod
Thin-walled pipes have been widely used in chemical facilities and propulsion structures, where the distortion problem induced by welding fabrication is common and prominent, deteriorating assembly accuracy and even reducing load-bearing capacity. External constraint has shown great capacity to control the residual stresses and welding deformation. The objective of this research is to investigate the effect of constraint on welding process in thin-walled 304 stainless steel pipes through experim
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