SU1649372A1 - Apparatus for samples torsion testing - Google Patents

Abstract

The invention relates to a test apparatus and can be used to examine torsional specimens. The purpose of the invention is to improve accuracy. The installation comprises a frame 1, a torsion 2 fixed on it at one end, an active gripper 3 fixed on the other end of the torsion, a passive gripper 4 fixed on the bed 1, a torque drive in the form of levers 5 and two electrical pairs

Description

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magnets and torque and torsion angle sensors fixed on torsion bar 2, respectively, between gripper 3 and levers 5 and between levers 5 and frame 1. Sample 7 is fixed in grips 3, 4 and twisted by turning the levers 5 voltages on electromagnets. Torque and torsion angle. The invention relates to testing equipment, namely to installations for testing torsional specimens.

The purpose of the invention is to improve the accuracy by ensuring the study of the dependence of the complex shear modulus of 6t oscillation frequency

Figure 1 shows the scheme of the proposed installation; figure 2 - section aa in figure 1.

The installation includes a frame 1, on which the elastic element is rigidly fixed at one end, made in the form of a tubular torsion 2, at the other end of which an active grip 3 is fixed. Passive grip 4 is fixed to the latter on the frame 1.

The installation contains a torque drive made in the form of two arms 5 fixed on the middle part of the torsion 2 and fixed in pairs on the base 1 symmetrically with respect to the axis of the levers 5 of electromagnets 6. On the torsion 2 there are sensors (not shown) of torque and twist angle, and the sensor is cool The current moment is fixed on the torsion bar 2 between the active gripper 3 and the levers 5 of the torque drive, and the sensor of the twist angle is fixed between the levers 5 of the torque drive and the frame 1.

The installation works as follows.

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In grippers 3 and 4, sample 7 is fixed coaxially with torsion bar 2.

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Then, to one of the levers diagonally located relative to the axis, 5 pairs of electromagnets 6 supply voltage, which causes the arms 5 to rotate.

They are determined with the help of appropriate sensors, the location of which on torsion 2 on opposite sides relative to the torque actuator fixed on its middle part provides the possibility of studying the dependence of the complex shear modulus on the oscillation frequency, which increases the accuracy of the test. 2 Il.

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twisting torsion 2 and sample 7. The corresponding torque is applied to sample 7, and the twist angle of sample 7 is determined as the difference between the twist angle of the levers 5 and the twist angle of the part of the torsion 2, on which the active gripper 3 is fixed. determined by the magnitude of the torque. I

Thus, placing the torque actuator in the middle part of the torsion, and the torque sensors and the twist angle on the torsion on either side of the torque drive, makes it possible to study the dependence of the complex shear modulus on the oscillation frequency, which improves the accuracy of the test.

Form ul inventions

Torsion test set containing a frame, one end fixed on the elastic element made in the form of a torsion, an active grip fixed on the free end of the torsion, a passive grip fixed on the frame and designed for mounting coaxially with the sample torsion a torque actuator and sensors torque and torsion angle, characterized in that, in order to increase accuracy by providing a study of the dependence of the complex shear modulus on the oscillation frequency, eplen on the middle part of the torsion bar and torque sensor and twist angle are fixed to the torsion bar respectively between the active gripper and the drive torque and the torque between the drive and the bed

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Claims (1)

Claim A torsion test specimen installation containing a bed, a 4Q torsion-shaped elastic element fixed to it at one end, an active grip fixed to the free end of the torsion bar, a passive grip secured to the machine and designed to be attached coaxially with the sample torsion moment, drive and sensors of torque and twisting angle, characterized in that, with: the goal of increasing accuracy by providing research on the dependence of the complex shear modulus on the oscillation frequency, torque drive akreplen on the middle part of the torsion bar and torque sensor and twist angle are fixed to the torsion bar respectively between the active gripper and the drive torque and the torque between the drive and the bed. / 4-L