SU84124A1 - Electromagnetic Fatigue Testing Machine - Google Patents

Description

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No. 84124

, CR1 | (,. Operating at a slightly lower frequency, the stiffness of the colliding dampers will add to the rigidity of the elastic machine system); wow its frequency.

  Measuring devices can be used optics (comparator, optical lever, vernier raster) or electric strain gauges with wire resistance sensors 7 connected to the corresponding electromagnet (clamps E and P of fig. 1), as well as other devices.

In illuminators of optical systems, the electric lamp 8 can be used as a light source, included in the appropriate number of isitTKOB windings of electromagnets (clamps B in Fig. 1).

Having supplemented the optical system with photovoltaic cells, lyuzhio to carry out remote measurement of the amplitude and frequency ko, 1sbapy of the test sample, as well as counting the number of cycles, and this will automatically stop the measurement when the sample is destroyed.

The electromagnets of the device are powered directly from the network of the alternating current by switching on in series (clamping AD) or in parallel (clamping LV and C). For this purpose, lamp or masinine generators with adjustable frequencies, self-oscillating self-excitation circuits or mixed feed circuits can be modernized electric current.

In order to reduce damping and dissipation of energy, oscillating flying mapps should have a significant degree of rigidity. From this point on, the 1 st. Head of the test specimen is clamped in the tail | ah e, 1electromagnets with screws 9 IU with screws 10.

,one. protect the windings from heat buildup and mechanical damage and 11 cover them with ribbed covers 7 /. The terminals of the ends of the windings to the clamps 12 on the asbestos-cement panels 13 or insulators must be sufficiently rigid.

The tails and the coils of the cores of electromagnets are made of aropic metal.: 1L, resistant to corrosion, with high,: 1st proc. BiniTbi pole tips and de-mifers are stopper and pin nuts or stop viiggs. The winding of electromagnets is performed with special density (stress). Insulation of the winding (enamel, glass 1P1a) to, 1fra to withstand the long-term effect of elevated temperatures, and e1) and cargo.

The suspension of the mask on rubber or spring-loaded shock absorbers 14 and the Chinese cable (jib) is made so that the stiffness of the elastic system does not decrease,

(to increase the stability of the work of the machine, instead of the spiral spring, between the poles of the electromagnets, a ploy spring 15 can be installed. C1 ;,,, and between each other, movable legs 16.

L ania allows you to create both bending and twisting momeits; coBMcnieiuie.M them in different ratios x can create the necessary conditions for fatigue testing in difficult-tense STATEAN1P1. In the nerve case (izib) the sample axis is located in the plane of oscillations of the electromagnet; (() ig. 1 p 2); in the second case; ) e (;) The sample axis is perpendicular to plane oscillations; B T |) In this connection, | uchech (joint bending-torsion deformation), the sample axis makes a certain angle with the plane of the 1 st, of the reading frequency (Fig. 4),

For iyytypanpy apply yu; special samples with a y; |, alenic middle (neutral) part, or simultaneously two parallel-clamped samples ((lg. 5 and 6).

For testing large specimens, Mainnna must have a cooTuRTo more powerful power and hardness. From this point on, the clamps are mounted on the sliding cantilever stops, and the magnetic closures are not through the sample and the air gap, but through the air gaps between both pairs of zeroes (Fig. 7).

For a fatigue test in an IoTi gondro-gas environment with varying temperatures to the machine, a corrosion chamber 17 (Fig. 2) is envisaged, covering the sample to be taken and fed from reservoir 18. Sksgauster 19 sucks the contents of the chamber / 7 with air into the asbestograph 1 or other seals 20.

The medium can be heated (evaporated) or cooled (condensed) in a chamber / 7 or in quartz coils 21.

The temperature of the test sample is measured by a thermocouple test 22, which is connected to the terminals of the electromagnets (Fig. D); The thermocouple junction connects with the sample and is soldered to it.

Prev Lets about i i

Claims (4)

1. Electromagnetic for metal samples for fatigue, excluding chia and with those.m., For the purpose of excited in the 1C of the sample of the harmonic undamped resonant, the oscillations are oscillated 1Y by the prince of the electric chamber, caused in the sample section, 1 joint Bending, twisting, stretching and compressing deformations, it is made in the form of an elastic electromechanical system “sample-electromagnets-spring-dampers that perform resonant 1.1 oscillations with an amplitude corresponding to a given stress of 1st in the 1st image and depending on the ratio of exciting and total s de lf Ipyyut.ix 2. According to claim 1, dated; i h a y c and so. that it is in the other e, the electromechanical system is made up of a pair of electromagnets suspended on shock absorbers and powered by a variable tokolg of pair electromagnets, in movable pole tips equipped with dampers, with a variable pitch, designed to be adjusted, in the head1 From 1 bridge 1 on the power of its tension 1, the natural frequency of free oscillation and elastic. 3. The form of execution according to claim 2, that is, with the aim of increasing the stability of the machine’s operation, instead of the spring 5, it employs FLAINTS 15 e steering, CONNECTED 5 e MOBILE Concepts and introduction into the gap between the poles of electromagnets. 4. In a machine according to PP, 2 3 is applied to a corrosioin, the coverage of the working sample of the test sample is provided with electric heating, a thermocouple, an exhauster and a cooling coupler, in order to conduct 1 x temperature in an aggressive liquid and gaseous medium. - l -AO 84124  J  J S   - 1--, 7ХЙ 1 Д t I -Si iJt | . ILiA I I -44 / L -. c I p u, | ,,. Fig Fig.1 / H W XEB-g j:,.: T 1 ;;