WEBVTT 00:00:00.000 --> 00:00:20.560 Hello, my name is Kiran Yakov. 00:00:20.560 --> 00:00:25.120 I am a Business Administration Mitarbeiter at the Institute for Microstructure Technology 00:00:25.120 --> 00:00:28.000 at the Karlsruhe Institute for Technology. 00:00:28.000 --> 00:00:32.800 I work in the group Smart Materials and Devices from Professor Manfred Hall. 00:00:32.800 --> 00:00:38.240 I am investigating the damping properties of many Taurissian damper structures 00:00:38.240 --> 00:00:41.840 that are located on a form of Gereshnitz. 00:00:41.840 --> 00:00:48.880 Form Gereshnitz are particularly active materials with a very high energy distribution. 00:00:48.880 --> 00:00:56.560 They have a non-conformist mechanical resistance, which gives super-elasticity and a dynamic effect. 00:00:57.520 --> 00:01:04.560 Some super-elastic form Gereshnitz bearings give a part of the mechanical energy as heat 00:01:04.560 --> 00:01:11.440 when stretching and return to the starting state when releasing, completely reversible. 00:01:11.440 --> 00:01:18.320 This loss heat or energy dissipation is very large in these materials, 00:01:18.320 --> 00:01:24.080 so the materials are especially suitable for passive damping elements. 00:01:26.960 --> 00:01:33.360 The interaction of heat and deformation generates complex patterns in the material. 00:01:33.360 --> 00:01:38.880 They generate temperature and stretching bands, which we make visible with an infrared camera 00:01:38.880 --> 00:01:41.760 and digital image correlation. 00:01:43.760 --> 00:01:50.800 Depending on the temperature of the operation, some form Gereshnitz bearings also show the one-way effect. 00:01:51.040 --> 00:01:59.840 The material maintains its deformation after the load and returns to its original form when enough heat is applied. 00:01:59.840 --> 00:02:07.760 This property can be used for active damping when you apply heat energy at the right moment. 00:02:07.760 --> 00:02:14.640 The high feedback power can be used for vibration stabilization, 00:02:14.800 --> 00:02:21.920 for example to stabilize sensors and cameras in mobile devices against hand vibrations. 00:02:25.120 --> 00:02:30.480 This bridge element is made of thin form Gereshnitz bearing foils, 00:02:30.480 --> 00:02:34.080 which show a one-way effect at room temperature. 00:02:37.360 --> 00:02:44.400 The foils only have a tenth of the thickness of a hair and react very quickly to temperature changes. 00:02:45.040 --> 00:02:50.400 The active damping is achieved by pulsing the electric heats and bearings. 00:02:52.000 --> 00:02:55.920 By heating the form Gereshnitz bearing bridge with current, 00:02:55.920 --> 00:03:00.880 the vibration amplitude is reduced and the one-way effect is achieved. 00:03:01.680 --> 00:03:09.600 This is a test sample for the test of vibration isolation with the help of form Gereshnitz microstructures. 00:03:12.800 --> 00:03:19.600 The shaker stimulates the system at different frequencies and the form Gereshnitz bearing microstructures 00:03:19.600 --> 00:03:23.520 reduce the transfer of vibration to the mass. 00:03:30.880 --> 00:03:36.480 I am a scientist at the Institute for Chemical Simulation at the Friedrich Alexander University in Erlangen-Nürnberg. 00:03:36.480 --> 00:03:42.080 Here in Fürth we study the form memory materials with simulation methods. 00:03:42.080 --> 00:03:50.080 We only need software, which we develop ourselves, computers and of course many measuring data, 00:03:50.080 --> 00:03:53.120 which we got from the Karlsruhe Institute for Technology. 00:04:01.680 --> 00:04:06.320 First we tried to describe the general material behavior of form memory. 00:04:06.320 --> 00:04:10.640 That means we need the physical equation for impulse and energy 00:04:10.640 --> 00:04:14.720 and a reaction equation for the martensitic phase conversion. 00:04:14.720 --> 00:04:23.120 To simulate the load behavior on the computer, we have to discretize all the components, 00:04:23.120 --> 00:04:28.080 that means we have to break down small elements so that the computer can understand them. 00:04:28.880 --> 00:04:33.600 Here we see for example the cyclic load of the form memory legions. 00:04:33.600 --> 00:04:38.000 As in the experiment, fine stretch and temperature bands are created. 00:04:44.560 --> 00:04:51.280 Here in this more complicated bridge suspension we see the stretch represented in color 00:04:51.280 --> 00:04:57.680 and it is noticeable that some areas are strongly shaped. 00:04:58.640 --> 00:05:07.040 Here we see another complicated geometry, a spring shock element in the form of a flat spiral spring, 00:05:09.040 --> 00:05:11.040 here for example after the load. 00:05:16.400 --> 00:05:20.800 The double bridge element including the swinging mass is modeled on the computer 00:05:20.800 --> 00:05:24.880 and then a load cycle is simulated with an infinite element program. 00:05:24.880 --> 00:05:28.880 We can determine how much energy can be? 00:05:35.760 --> 00:05:42.160 For the input material used here we see that a permanent stretch remains in the thin beams.