SU1315871A1 - Device for determining dynamic shear modulus of thin glass fibres - Google Patents

Abstract

The invention is intended to determine viscoelastic characteristics, such as shear modulus, loss modulus, and mechanical loss angle tangent, and can be used to test the synthesis of glassy materials in industry producing and using glass materials. The purpose of the invention is to increase (L with: s sd with

Description

131

accuracy of results. The presence of misalignment and misalignment between the upper clamp 9 and the lower clamp 13 entails a decrease in the measurement accuracy and breakage of the investigated glass fiber. The screw 18 raises the electromagnet 17 with the disconnected voltage and the lower clip 13 free standing on it to the lower end of the pre-. correctly mounted on top of the sample. After that, the sample is attached to the rod 14 of the lower clip 13. Then the electromagnet 17 together with the electromagnetic table 6 is lowered when the microscrew 18 rotates in the opposite direction, and the lower clip 13 freely hangs.

The invention is intended to determine viscoelastic characteristics such as the shear modulus, loss modulus and mechanical loss angle tangent, and can be used to test the synthesis of glassy materials to obtain them with certain deformation parameters in the industry, introducing and using glass materials, in radio engineering and aviation industry, as well as for scientific research.

The purpose of the invention is to improve the accuracy of measurement results.

Fig. 1 shows an apparatus for determining the shear modulus of thin glass fibers; Fig. 2 illustrates an optical shutter fastening system.

A device for determining the shear modulus of thin glass fibers consists of an oscillatory system that includes engine 1, gear 2 with a photoelectric converter 3 rotation of the gear shaft. The periodic electric sinusoidal signal is due to a non-centered optical pinch A.

The oscillating system also includes a lightly movable frame 5 with an electric winding. Frame 5 is centered using supports 6 in to.

one

saves on the test fiber, thereby ensuring the coaxiality of the lower and upper clamps 13 and 9. Next, the electromagnet G / along with its table 16 rises again until the surfaces of the electromagnetic table 16 and the disk 15 of the lower clamp 13 touch, and then the "B" passes through the winding of the electromagnet 17. As a result, the electromagnetic table 16 and the lower jaw 13 are connected by magnetic forces that prevent the lower jaw 13 from moving, ensuring that the clamps are coaxial when the glass fiber under study is twisted. 2 Il.

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J5

20-30 25

a constant magnet 7 having the possibility of vertical movement along a linear bearing 8.

The upper clamp 9 of the investigated glass fiber placed in the heat chamber 10 is rigidly attached to the frame 5, and the optical shutter 11 of the recording photoconverter 12 is rigidly attached to the lower end of the investigated fiber attached to the lower clamp 13 in the form of a refractory steel rod 14, rigidly connected to the disk 15 of electrical steel outside the heat chamber 10, the rod 14 and the disk 15 are the constituent parts of the lower clamp 13 for the fiber under study. The lower clamp 13 is located on the electro magnetic table 16, which is the core of the electromagnet 17. The electromagnet 17, together with the electromagnetic table 16, has a lifting micrometric screw 18 for vertical movement.

The permanent magnet 7, the frame 5 with core supports 6, the upper clamp 9, the optical shutter 11 is balanced by the counterweight 19.

The information is recorded by a two-coordinate recorder 20.

A device for determining the dynamic shear modulus of fine glass fibers works as follows.

The magnet 7 is flowing a current, in the result of which the electromagnetic table 16, the lower clamp 13, are connected by magnetic forces that prevent the lower clamp 13 from moving away from the seat, thus providing the upper and lower clamps and 3.

Application of the lower clamp 13, with

When voltage is applied to the motor 1, it transfers torque to the gearbox 2, the shaft of which introduces the optical shutter 4 attached to it into the gap of the photoconverter 3. The optical shutter 4 is fixed to

the gearbox shaft in this way (Fig. 2), the HO standing out of two rigidly attached, that when the shaft rotates 180 °, it moves from position A to position B, not the output completely from the gap of the photovoltaic converter 3. The optical shutter profile is chosen so that photoconverter realizatiyparky - refractory nonmagnetic. the rod 14 and the disk 15 made of electrical steel allows to separate the magnetic parts from the heating zone J5 of the sample under study.

Thus, the use of electromagnetic fastening systems of the lower clamp 13, consisting of an electromagnet 17, having the possibility of passing a sinusoidal periodic electric signal which is fed to the winding of the frame 5, placed

in the field of the permanent magnet 7, turn-20 vertical displacement, with the core.

thirty

its angle to the angle proportional to the value of 3 signals coming from the converter. At the same time, this signal from the photovoltaic converter 3 is fed to the Y input of the two-coordinate recorder 20. The rotation angle of the frame 5 depends on the viscoelastic characteristics of the fiber under study and is recorded by the photoconverter 12, the electrical signal from which is fed to the Y input of the two-coordinate recorder 20. By the difference The phases of the signals from photoconverters 3 and 12 are judged by the viscoelastic characteristics of the glass of the n-35 fiber under study.

The presence of misalignment and distortions between the upper 9 and lower 13 clamps entails a decrease in the measurement accuracy and breakage of the glass fiber under study.

To prevent this, the micrometer screw 18 raises the electromagnet 17 with the voltage disconnected

made in the form of an electromagnetic table 16, with a lower clip 13 located on it, made of two rigidly fastened parts — a disk 25 ka 15 of electrical steel and a rod 14 of refractory non-magnetic steel — ensures the coaxiality of the lower and upper clamps, which leads to the elimination the possibility of distortions and breakage of thin glass samples when they are fastened in the clamps.

Claims (1)

Formula of inventions A device for determining the dynamic shear modulus of thin glass fibers, containing a forced torsional vibration excitation system, upper movable, lower fixed clamps for fastening the sample under investigation, information retrieval system, characterized in that, in order to improve accuracy 40 and free standing on the bottom of the 45 measurement results by providing 13 to the lower end of the pre-coaxiality of the clamps, the device attached to the top of the sample, after which the sample is attached to the rod 14 of the lower clip 13. The electromagnet 17 together with the electromagnetic one-50 consisting of an electromagnet, having 16 lowered during the rotation of the micro screw 18 in the opposite direction, and the lower clip 13 hangs freely on the test fiber. Then the electromagnet's ability to move vertically, with a core made in the form of an electromagnetic platform with a lower clip located on it, wears 17 with the table 16 again lifts up-55 prepared from two rigidly fastened-before the contact of the surface parts - a disk from an electro-electromagnetic table 16 and a disk 15 of chesky steel and a core from a refractory - the lower clip and on a winding of electrocute nonmagnetic steel. 315871. 4 the magnet 7 is flowing a current, as a result of which the electromagnetic table 16 and the lower jaw 13 are connected magnetic forces that prevent the lower jaw 13 from moving, thereby ensuring coaxiality of the upper and lower clamps 9 and 3. The use of the lower clamp 13, W, GO standing of two rigidly fastened standing of two rigidly fastened parts - refractory non-magnetic. the rod 14 and the disk 15 made of electrical steel allows to separate the magnetic parts from the heating zone of the sample under study. Thus, the use of an electromagnetic fastening system of the lower clamp 13, consisting of an electromagnet 17, has the ability to made in the form of an electromagnetic table 16, with a lower clip 13 located on it, made of two rigidly fastened parts — a disk 15 made of electrical steel and a rod 14 of refractory non-magnetic steel; this ensures the coaxiality of the lower and upper clips, which leads to the elimination of the possibility distortions and breakages of thin glass specimens when fastened in clamps. Formula of inventions A device for determining the dynamic shear modulus of thin glass fibers, containing a forced torsional vibration excitation system, upper movable, lower fixed clamps for fastening the sample under investigation, information retrieval system, characterized in that, in order to improve accuracy to determine the dynamic shear modulus, it is equipped with an electromagnetic mounting system for the lower clamp, consisting of an electromagnet, having ability to move vertically, with a core made in the form of an electromagnetic platform with a lower clamp located on it, Riga.g Editor P.Geershi Contributor V.Krutin Tehred M. Khodanich Proofreader V. But ha Order 2354/46 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. d., 4/5 Production and printing company, Uzhgorod, st. Project, 4