Molecular Materials Science and Engineering, New Type Vibration Absorbing Agency, Molecular Composites. Xiong Xiong, Zhang Huiping, 1 Spinning University, Textile Science. Unload 20005 Sakuchi Ayumi Engineering Department, Tokyo Institute of Technology, Tokyo, Japan In recent years. In order to solve the problems of viscoelastic effect 1 and friction effect in polymer materials, the shock-absorbing effect of vibration-damping materials is not very satisfactory. Based on the new principle of vibration reduction, researchers in the Institute have begun researching new vibration-damping materials such as piezo-electric effects using certain materials. Convert mechanical energy into electrical energy.
Then, under the given conductive network, the electrical energy is converted into heat energy to achieve the effect of vibration reduction. However, these types of vibration-reducing materials have been asked. In the past, most of these piezoelectric materials used inorganic ceramic piezoelectric materials because of inorganic ceramic materials and organic high. The modulus of elasticity of the molecular material is too large, resulting in a force transmitted from the outside, and the efficiency of the transfer is very poor. Therefore, the damping effect of this type of material is not very satisfactory. This study allows to discuss the use of a piezoelectric effect with a piezoelectric effect, that is, in a polymer material, mixed with piezoelectric dielectric properties, mechanical materials and conductive properties The carbon fiber material, using piezoelectric exchange and dielectric effects, converts the external vibrational energy into a fixed potential 0, which is then formed inside the mountain material, so as to achieve vibration damping, 1 principle is beer. 13, In the absence of vibration, the internal dipole of the material is randomly distributed. Balance of dipole moments, non-electrical properties When subjected to vibrations, the internal dipoles of the material are regularly arranged. This material has a constant potential. 1(1) If the internal resistance of the composite material at this time is too large to correspond to an open circuit, or if the resistance is too small to be a short circuit, the generated electric energy does not disappear. Electric energy will turn into vibration energy. Continue to vibrate bitter this time when the internal resistance of the composite material is appropriate, the generated electrical energy will be converted into heat energy and consumed, and the vibration attenuation will be accelerated.
In this way, if the internal resistance of the composite material is equal to that of the dielectric material, then the dielectric material will have the fastest decay in the polymer material.
Such as carbon fiber, the conductivity of polymer materials will change with the increase of the amount of conductive material filling, when reaching a certain critical filling amount, the conductivity of the polymer composite material will have an increase of the nearest power 4! Therefore, if produced by rice, the date of receipt is 2000 y1 revised date 2000223 3 Results and discussion 18.4 is the distribution of composite conductivity with carbon fiber, the volume content of 0 increases, from which we can see that when the carbon fiber content increases to determine When the value, ie, the critical value of the material is approximately 1, the electrical conductivity of the composite increases by 1 large jump. From the sun. 4 It can also be seen that the rise of the conductivity of the composite material is widely distributed. When the carbon fiber content is applied to industrial production of 1 ss. 20, the amount of carbon fiber is adjusted so as to control the 2.22 vibration damping performance of the composite. The damping performance of the material uses a logarithmic decrement rate of 56 = 4 where A is the logarithmic attenuation rate, and the solid vibration frequency is the attenuation of the vibration to the initial value. The device sample size of 3 is 501 in length and 10.1 in thickness. 5 The sample is fixed immediately, the length of the vibration part is adjusted to its natural frequency, and the conductivity of the 50 minute molecular dielectric constant dielectric voltage of the organic material and the conductive material is near the critical filling amount, and only slightly changes the filling amount. It will be a very big change at this time, if the composite material chooses the appropriate conductivity, that is, the appropriate resistance, the circuit will be formed by the conductive material. It will be as described. The vibration energy is converted into electrical energy by the dielectric effect and electrical conversion of the dielectric organic material, and this, the circuit formed inside the village material, converts this electrical energy into heat energy consumption, thereby accelerating the vibration attenuation, and achieves the purpose of vibration reduction. 2 Experimental section 2.1 Samples The base material used in this experiment was chlorinated polyethylene 0 manufactured by Showa Denko, Japan; strong dielectric organic material 1 heart 1; Superfine carbon fiber. It is made from the Showa Denko. Density 1.81 plus 3, average diameter 0. åŸ Average length 1.01 The above material was passed through a double roller mixer and kneaded at about 65, followed by hot press molding at a temperature of 120 and a time of 20 pressure. 7 cubits, the respective body-to-cement ratios of the resulting sheet material were 4 off, and the carbon fiber was 0, 2.2 Test Method 22.1 Determination of Electrical Conductivity The conductivity was measured along the sheet thickness direction. The test piece in the 2.1 sample was made into a small square piece of 202, and was painted with 121.121 area of ​​electric silver powder on its surface. The relative value of the fabric measured at normal temperature is probably due to the large viscosity value of the base material chlorinated polyethylene 0, which makes it more difficult for the carbon fiber to form a conductive network in the matrix. In addition, the composite material used in the organic material 0 B because of its lower melting temperature of about 1, about 1, flash this, in the mixing process, the melting of 4 packs of street in the carbon fiber cents. When the content of carbon fiber is small, it is difficult to form a network of recorded tuners. To observe the distribution of carbon fiber in the composite material, the cross section of the carbon fiber was observed with a scanning electron microscope. Distribution of materials 1 From the photos, it can be seen that due to the low content of carbon fibers, the fibers are easily covered by the organic material 02, and it is difficult to form a fixed conductive network. Figure 28.6 is the critical value. Distribution of carbon fiber content in composite materials The photo shows that with the increase of the fiber content and the critical value, the contact between the fibers starts to increase. At this time, a predetermined conductive network is gradually formed and the electrical conductivity of the composite material is large. 7 for use, the heart 3 device to pay the sample into the vibration attenuation test results. Change. 8 is the distribution of the impact of the carbon fiber content on the logarithmic decrement rate after the test, from which it can be seen that in 8.7, the resistance is usually large, that is, the conductivity is very small, which is equivalent to the open circuit, or 8.7 Zhongshan The resistance is very small, that is, the conductivity is large. In this case, it is equivalent to a short circuit and the vibration attenuation is very small. This is in accordance with the results explained in the principle that the electric energy generated at this time does not disappear, and the electric energy quickly transforms into vibration energy and continues to vibrate. Yang 7 in 1 and å“š. In 7, the electrical resistance of the composite lining at this time is just after the critical value of the fiber content, the formation of a fixed conductive network, but not completely conduction, production. The electrical energy passes through the decimeter circuit formed in the anti-material. Rapid conversion into heat energy is consumed. Accelerating the attenuation of the vibration is also consistent with the results of the previous principle analysis. +8 pass time. The logarithmic decay rate is low, and there is a peak position near the critical value of the conduction conduction. Therefore, from the above results, as long as the amount of carbon fiber in the material is appropriately controlled, it is possible to make The vibration quickly declined. In order to obtain the required vibration damping material beer plus + China Science and Technology Press (1) Xu Ruxin andTechnologyPress,1993149.