SU91273A1 - Fatigue Testing Machine - Google Patents

Description

Prsd.1zgasma Aiaiiiniia thank you ;; m; npi / r.icKOii.no BiiOjiaTOpci ;, claC / xc: with unbalanced masses, allows to produce using simple adjustments; 1, extracting and pulling compresses, torsion, stretching and compression.

FIG. 1 shows the kinematic machine schema; in fig. 2- longitudinal section of the machine; in fig. 3 bending tester; in fig. 4 is the same for the tensile compression test; in fig. 5 is the same for torsion testing; in fig. 6-section but AA in FIG. five.

The machine is driven by an electric motor of the first current (with adjustable angular velocity), which is installed inside the bed 2 and by a belt 3 is connected with Koj5o6Koii ;;; orsta; -. I cj; cOKa speed consists of four. X identical gears. The axes of the crankshaft nystusp are connected to the axes of the vibrators by the hinge rollers 5 (5. vra1tsa: ours in the lower arms located in the casing of the movable table 7. Each vibrator consists of a screw rigidly fixed on the smallpox, and a balanced weight.

The weights of the vibrators 6 have the same weight; they are set on the scales 10 at the same distance from the axes. The motor operation of the GRZZA arises in opposite directions, creating an unbalanced inertial distance in the vertical direction and balanced forces of the horizontal in the horizontal direction.

Under the action of a vertical force movable; : table 71: likr / enlepnoe to him, with its active part, the corresponding device performs an oscillatory motion. In this case, the movable table makes movement in the four limiters, which are not axial but two ball bearings, which run in along the guide bars 12 of the movable table.

The inertial force unbalanced in the vertical plane through the movable table and corresponding devices is transmitted to the sample, loading it dynamically.

The movable table at the bottom rests on the coil spring 13, which in turn rests on the cup 14 fixed on the flange of the screw 15. As the flywheel 16 rotates through the bevel wheel 17, the rotation is transmitted to the wheel 18, and the screw 15 receives a movement in two guides. An arrow 19 is attached to the cup 14, which then moves along the scale 20, indicating the value of the static load on the sample.

The bending tester 21 is fastened with two extreme legs on the lid of the bed 2, and with two Sponge 22 with a sponge 22, the sample 23 is fastened in the tool and is loaded with a bending moment along the length of the specimen.

In the device for testing and stretching and compression, the sample 25 is fastened in a vertical position: the upper end to the fixed wall 25, the lower end to the fixture 27, screwed to the nlit of the movable table.

The torsion has a shatch 29, which on one side is sharnier to the wall 30, screwed in turn to the upper plane of the movable table 7, and on the other side is rigidly connected to the butt-clamping of the sample 31, which lies in the needle node 32 .

Sample 8 with sponges is clamped on one side in a moving gripper transmitting torque: to the sample, and on the other hand in a fixed gripper attached to stand 9. When the sample breaks during the limit switches 24, the machine automatically stops. To control the angular velocity of the vibrators and to count the number of cycles from the beginning of the start: on the end of the test, the machine is equipped with a total counter.m. of speed 28.

PRED METHOD

1. A machine for testing materials fatigue by bending, twisting or stretching and compressing with adjustable static loading, characterized in that, in order to load and non-rotating variable load, it is made in the form of a rigid frame, and which installed vibrators equipped with unbalanced masses , the inertial forces of which are balanced in the o / henna plane and create for the loaded sample a reciprocating motion of the table in another plane.

2. The machine, but clause 1, is designed so that it is equipped with interchangeable devices for testing the specimen for bending, twisting, or tension-slip: compression.

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