SU1481644A1 - Device for mechanical testing of specimens - Google Patents

Abstract

The invention relates to a measurement technique and can be used in industries that manufacture and use products based on polymeric and glass materials, as well as for scientific research. The goal is to improve the accuracy of measuring the mechanical dynamic characteristics of materials by reducing the static stresses in the sample. The longitudinally deformable sample is located horizontally and the device is equipped with an additional thread of suspension of the movable plate of the oscillatory system. The oscillatory system is made so that the geometrical axis of suspension of the movable plate and the horizontal geometrical axis of the oscillatory system are located in the same vertical plane with the intersection point in the center of mass of the movable system of the device. 2 Il.

Description

one

 The invention relates to a test technique and can be used in developing the technology of material scattering with the aim of obtaining them with certain deformation characteristics in the industry producing and using synthetic polymeric and glassy materials, as well as for scientific research.

The aim of the invention is to improve the accuracy of the measurement of mechanical and dynamic characteristics by reducing the static stresses in the sample.

FIG. 1 shows a diagram of the device; in fig. 2 - recording of the oscillatory process.

The device contains a base 1, clips 2, a horizontally located sample 3. One of the clips is rigidly connected to the rod 4 of a magnet of durable material and a movable plate.

5 oscillatory system. A stationary plate 6 of the capacitive sensor is mounted on the housing of the high-frequency generator 7, where also the electromagnet 8 of the oscillatory process excitation system is located. The high-frequency generator is attached to a vertical stand 9 located on the guides 1 0 and the skids 1 1 with the possibility of moving in a horizontal

 direction.

u

00

about

J

The drive consists of an electric motor 12, a gearbox 13, a gear wheel 14 and a helical gear 15. The base is mounted on vibration insulators 16. The movable plate 5 of the capacitive sensor is suspended on a filament 17 of material with low elastic characteristics and low loss of internal friction fixed an upper end on the bracket 18. The oscillation process and its processing are excited by the electronic unit 19.

The device works as follows.

The electronic unit 19, which is similar in its nodes and functional connections to the electronic unit used in the prototype, receives a signal to the electromagnet 8, by means of which longitudinal mechanical oscillations are excited in the oscillatory system. As a result, in the oscillatory system (thread 17, movable plate 5 of a capacitive sensor, rod 4, movable clamp 2, sample 3), continuous oscillations occur at its resonant frequency (Fig. 2, zone a). After the excitation signal is removed, the oscillatory system performs freely damped longitudinal mechanical oscillations (Fig. 2, zone b), which

sample 3 and hanging the movable plate 5 of the capacitive sensor on the thread 17 allows to increase the measurement accuracy of the physicomechanical characteristics of materials by eliminating the effect of constant tensile stresses on them when the movable plate of the capacitive sensor is suspended on the sample in case of its vertical location This is especially significant in studies in the high-temperature region, when the material passes from an elastic to a flowing state.

The technical and economic effect of the implementation of the proposed device is to improve the quality of scientific research in the development of synthesis technology and the production of glass fibers for optical waveguides with specific deformation

properties.

/

Claims (1)

Invention Formula A device for mechanical testing of samples, comprising an oscillating system with a movable plate, clamps for securing the sample, an excitation system and a system for recording oscillations of the sample, characterized in that the aid of a capacitive sensor and high-hourly - an increase in the measurement accuracy of the mechatronic generator 7 is converted into their electrical analog and processed by the electronic unit 19. The required clearance between the movable 5 and the fixed 6 plates of the capacitive sensor is established by means of a horizontal displacement drive of the upright column 9 with a bracket 18 along the guides 1 0 and sagas 11 by means of an electric motor 12, a gear 13, a gear 14 and a helical gear 15. Thus, the horizontal arrangement of the longitudinally deformable physical and dynamic characteristics by reducing static stresses in the sample, the clamps are located along the horizontal axis, 40, the device is equipped with a suspension thread of a movable plate of an oscillating system, and the oscillatory system is designed so that the geometrical axis of the suspension of the movable plate and 45 The rhythmically geometrical axis of the oscillatory system is located in the same vertical plane with the n-intersection point in the center of mass of the mobile system of the device. physical and dynamic characteristics by reducing the static stresses in the sample, the clamps are located along the horizontal axis, the device is equipped with a thread of suspension of the moving plate of the oscillatory system, and the oscillating system is designed so that the geometric axis of suspension of the moving plate and the horizontal geometric axis of the oscillatory system are located in one vertical plane with the point of intersection n in the center of mass of the mobile system of the device. / 3 7G w M J3 , 224 75 W //////// 1481644 / / P Cooling  . P / P - m / .. ----- nooivbooooooQO w o w o o d o w 0 v v / Bake / 7 / / YU , / & ///// & FIG. 2