SU991252A1 - Device for determination of adhesion bond shear-strength - Google Patents

Description

The invention relates to techniques for testing materials for friction and wear, in particular adhesive bond strength.

A device is known · for determining the strength of the adhesive bond to a slice containing a body, a table designed to accommodate the test flat sample, a loading mechanism interacting with the table, a counter-sample holder, a translational movement mechanism and a friction torque meter. The holder of the counter-sample is made in the form of a lever, and the counter-sample is made spherical With ¹ ] ·

However, the known device does not allow to measure the strength of the adhesive bond on the shear during sliding friction, since it has the indenter spinning, and not slip, which is typical for the operation of real friction pairs.

The aim of the invention is to improve the accuracy of determining the strength of the adhesive bond to shear.

This goal is achieved by the fact that the device for determining the adhesion bond to a slice containing a body, a table designed to accommodate the test flat sample, a loading mechanism interacting with the table, a counter sample holder, a translational movement mechanism and a friction moment meter, are equipped with roller bearing carriage designed to fix the sample on it and connected with the translational movement mechanism, the counter-sample holder is made in the form of two rectangular ra approx with diagonal elastic peredachka ,, which is fixed at the intersection kontrobrazets configured in the form of a body of revolution, and measuring the friction torque peredachka fixed to the framework.

The drawing shows a device in to determine the strength of the adhesive bond to shear, General view.

A device for determining the strength of the adhesive bond to the shear contains a housing 1, a table 2, placed on a table 2 on a roller bearing 3 ka * 5 retract 4, in which the test is fixed, give a flat sample 5, the loading mechanism 6, interacting with the table 2 through the spring 7 The holder of the counter-sample 8 in the form of a body of revolution is made in the form of a rectangular frame with diagonal elastic jumpers 10 and 11, at the intersection of which the counter-sample is rigidly fixed. Measuring instruments 12 and 13 of the friction moment, made in the form of strain gauges, are fixed on the jumpers 10 and 11. The mechanism 5 14 of the translational movement is connected with the carriage 4 through the rod 15.

The device operates as follows.

¹⁰

A flat sample 5 of the material to be studied is fixed in the carriage 4, which, thanks to the roller bearing 3, moves relative to the table 2. In the jumpers 10 and 11, a counter-sample 8, made in the form of a body of revolution, is rigidly fixed 15. The load is set by the loading mechanism 6, it is increased to a value sufficient to obtain a plastic imprint of 20 ka on the sample 5. The meters 12 and 13 (strain gauges) are connected so that their deformation under the influence of only normal load does not cause an imbalance of the measuring circuit 25. The carriage 4 is set from the mechanism 14 to translate relative to the counter-sample 8. The resulting friction moment between the sample 5 and the counter-sample 8 tends to rotate, the θ of the latter being rigidly fixed in the elastic jumpers, deforming them. By reducing the resistance of the gauges 12 and 13 (strain gauges), the moment of friction is judged. Knowing the radius of the counter-sample and the area of its contact with the sample, measured by the imprint, the shear strength of the adhesive bond is found.

Using the invention allows more accurate testing of friction pairs, as close as possible to the actual conditions of their work during sliding friction.

Claims (2)

9 with diagonal elastic bridges 10 and 11, at the intersection of which the contra-sample is rigidly fixed. Measuring bodies 12 and 13 of the friction torque, made in the form of strain gauges, are fixed on bridges 10 and 11. Mechanism 14 translational movement is associated with the carriage 4 through the rod 15. The device p is sent as follows. A flat sample 5 of the test material is fixed in the carriage 4 ,. which due to the roller bearing 3 moves relative to the table 2. Contrastem 8, made in the form of a body of revolution, is rigidly fixed in bars 10 and 11. The load is set by the loading mechanism 6, it is increased to a value sufficient to produce a plastic imprint on sample 5. The meters 12 and 13 (strain gauges) are connected in such a way that their deformation under the action of a normal load does not cause an imbalance of the measuring circuit. The carriage 4 is set from the mechanism 14 by translational movement relative to the counterpiece 8. The arising moment of the friction between sample 5 and Counterpiece 8 tends to turn the latter, rigidly fixed in elastic bridges, to deform them. To reduce the resistance of the gauges 12 and 13 (strain gauges), the moment of friction is judged. Know the radius of the counterpiece and the area of its contact with the sample measured by a print. find the value of adhesion bond strength per cut. The use of the invention allows for more accurate testing of friction pairs as close as possible to the actual conditions of their work under sliding friction. Apparatus of the Invention A device for determining the strength of adhesive bond to a shear, comprising a body, a table for placing the Test Plate sample, a loading mechanism interacting with the table, a counterpiece holder, a translational movement mechanism and a friction torque meter characterized in that increase accuracy, it is equipped with a carriage placed on the table on a roller bearing, designed to fix the sample on it and connected by the mechanism of translational movement, The counterpiece socket is made in the form of two rectangular frames with diagonal elastic bridges, at the intersection of which a counterpiece is made, made in the form of a rotating body, and the friction moment meter is fixed on the frame bridges. Sources of information taken into account in the examination 1. USSR author's certificate 268722, .cl. G 01 N 19/04, 1972 (prototype). t U //// /////// L  / G2 73