In this paper, we aim to clarify the effect of cutting direction on the cutting characteristics in the wedge indentation processing of polyethylene terephthalate (PET) film with mechanical anisotropic properties. In order to reveal the cutting characteristics due to difference in cutting direction, the cutting line force of a center bevel blade on the PET film was measured by setting the cutting direction to machine direction (MD) and cross direction (CD), and the cutting surface was observed. From the results, the cutting line force was shown that CD is higher than MD. There were three deformation modes of the cutting surface, and the occurrence frequency was different between CD and MD. In addition, a finite element method (FEM) analysis was carried out to compare the difference in cutting deformation and internal stress state due to cutting direction and lubrication state. It is clarified that the cutting deformation of the PET film is characterized by the tensile test based mechanical properties and the frictional coefficients with the wedge and underlay.
In this paper, we aim to clarify the effect of cutting direction on the cutting characteristics of polyethylene terephthalate (PET) film with mechanical anisotropic properties during the wedge indentation process. In order to reveal the difference in the cutting line force due to the cutting direction, the wedge cutting force on the PET film was experimentally measured by choosing the cutting direction as the machine direction (MD) and the cross machine direction (CD), while the cutting profile of the PET film was observed from the side line direction. From the experiment, the cutting line force of PET film in orthogonal to CD was the larger than the cutting line force of PET film in orthogonal to MD. It was found that there were three deformation modes of the cutting profile and the occurrence frequency of these modes was changed with respect to the cutting direction. In addition, a finite element method (FEM) analysis was carried out to compare the cutting profile and the internal stress state in the sheared zone due to the difference of the cutting direction and the lubrication state. It was clarified that the cutting deformation of the PET film at the necked stage was characterized by the tensile test based mechanical properties and the frictional coefficients with the wedge blade and the underlay.
We have been investigating how to use Paramecium for bio-micromachines. Paramecium was controlled by the weak electrical field by applying their negative galvanotaxis. In our previous paper, we succeeded controlling paramecium very stably for over 100 laps along the star-shaped target route in the vertical plane pool. We also succeeded to transport the object by using Paramecium. We also found that the softness of the object is important for Paramecium to transport. Therefore, based on these facts, we succeeded dropping the gel ball from the shelf in the designated direction, continuously in three shelves. Therefore, in this report, we developed an algorithm for transporting objects for Paramecium which makes possibility of collision high by setting a route consisting of 4 points. In this paper, we also investigated how to make a soft operation tool made of super gel and attach it to a Paramecium. We found that if we insert a Paramecium to a hole in a super gel film, the activity of Paramecium did not decrease.
本研究は, 数°Cの温度変化で可逆的な形状変化が提示できる教材を開発し, 小学校4年理科「物の体積と温度」単元の発展学習で使用した。児童の学習内容と教材の原理に関する理解, 教材に対する有用感について調査した結果, 児童は学習内容と教材の原理を正しく理解し, 教材に対する有用感が高いことから, 本教材は固体の温度変化に伴う体積変化を学ぶ教材として有用であることが示唆された。