Tetsuo Kumazawa

Dynamic Deformation Evaluation by Electro Motive Force

An electromotive force (Emf) was generated during metal deformation and measured with a thermocouple. Both the Emf-strain curve and stress-strain curve were obtained simultaneously in a tension test [1]. The Emf curve was correlated with the stress curve which depends on thermal change, i.e., strain energy. Therefore, this method was applied to a dynamic and an impact deformation test. Both Emf and strain were measured in a vibration test of a steel plate at first. Secondly, an impact test using a Hopkinson-Bar was conducted. Finally, the Emf data in the dynamic and impact loading range were reported.

The Flexible 3-Dimensional Load Measurement Sensor Using the Elastic Sphere

A product is manufactured by the robot at a factory. The present robot’s surface (especially robot arm part) is a metal. Therefore, it is dangerous if human contacts a robot. Since it is certain to use a robot for medical treatment or welfare in the near future, a possibility that a work robot and a human will contact becomes high. When a robot and human being will live together in the near future, it is necessary to develop the sensor which carries out flexible modification. Although the 2-dimensional distribution load measuring method using flexible material is proposed, the sensor which can detect load in three dimensions is not developed [1]–[2].