SU1429004A1 - Method of determining strength of adhesion between layers of bimetal joint - Google Patents

Abstract

The invention relates to the testing of materials, and specifically to methods for determining the adhesion strength between the layers of a bimetallic compound. The aim of the invention is to improve the accuracy of determination. Two identical bimetallic compounds are made with layers 1 and 2 of the base with thickness B and layers 3 and 4 of the coating. On layers 3 and 4, they are made of corrugation 5 so that they have an equal pitch, a profile in the form of a right triangle with one of the faces perpendicular to the load and C (0.3 ... 0.5) H, where H is the thickness of layer 3. The compound is assembled so that a package is formed with full interaction of the reefs of layers 3 and 4. On layers 1 and 2, two parallel holes are made at distance T, and 6 and 7 are from different sides of the package. The depth of each slot is equal to A B + 2H - C. Outside the slits, a tensile force is applied to the package until the joint between layers 1 and 3 of the joint, along which Roma judge the properties of the compound, 2 h. n. f-ly, 3 ill. and s

Description

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The invention relates to the testing of materials, and specifically to methods for determining the adhesion strength between four layers of a bimetallic compound. I The purpose of the invention is to improve the determination accuracy,

; Figure 1 shows the samples; figure 2 - connection in the collection; in FIG. 3, the test circuit of this method.

i The method is carried out as follows.

Two strips with layers of bimetallic compound are cut out from the sheet.

and 2 base materials and layers; i and 4 of a thinner coating material. On layers 3 and 4, the joints are corrugated with equal pitch of a deep C (0.3 ... 0.5) H, where H is the thickness of layers 3 and 4, in the direction of the perpendicular The expected load direction, with a profile in the |; e of a right-angled triangle with one of the faces of 5, perpendicular | 1 line of action of the load, and with an angle at the vertex U. A bag of two identical compounds is assembled so that a full closure occurs between the grooves. Fix part of the connection and the outer layers

1 and 2, slots 6 and 7 of depth A B + 2H-C are parallel to each other at a distance T from each other from different sides of the package: where B is the thickness of layer 1: Ш1И 2о To the ends of the package outside the slots j6 and 7 apply tensile load P ..

which causes a slice in

wed place of the junction of layers 1 and 3 or 2 and 4

each compound in the package. The magnitude of the load is judged on the strength of the joint.

Example. From the bimetallic strip (11 kp steel was used as the base, L90 brand brass, the coating thickness was 2.8 mm as the coating,) samples of size AxxC 100x15x6 mm were cut,

On layers 3 and 4 of the coating on the planer, the grooves were made, in section representing a right triangle, one of the legs of which is perpendicular to the joint area, 1.0 mm deep. When this is the angle of the corrugated y was 25. If the pitch of corrugation is equal, the profile of corrugation may differ from that indicated (in particular, rectangular, trapezoidal, etc.). Direction

It is perfectly perpendicular to the direction of the applied load. Collected a set of two samples

laid layers 3 and 4 of the coating

inwards so that the reefs are hooked along the central part of the kit, additional fixation of the samples in the complex was carried out using a clamp. In such

The state in the set was performed by a disk milling machine parallel slots 6 and 7 with a depth of 7 mm, while maintaining a distance of between them mm.

5 Then, the prepared set of samples was clamped in the testing machine. not INSTRON-1001 and applied the load, and the clamping force of the clamp should be negligible,

0 order (5-7) 10 Pa, 50-70 kPa, sufficient to fix the two samples in the kit, and destroy the connection. The adhesion strength was judged by the force of the destruction of the PC to the area of the joint zone.

Claims (3)

1. A method for determining the adhesion strength between the layers of a bimetallic compound, according to which two identical bimetallic compounds are placed in a package with layers of the same material inwards, two parallel cuts are made on its surface and a load is applied to the package until it is destroyed. The strength of the joint is judged by the magnitude of the breaking load, characterized in that, in order to improve the accuracy of the determination, on the inner surface of each joint, before placing into the package, corrugations are made with equal pitch in the direction perpendicular to the direction of the applied load and depth , 3 ... 0.5) H, where H is the thickness of the inner layer, and the slits are made of depth A B + 2H-C, where B is the thickness of the outer layer 2. Method pop. 1, differing from that with the fact that the grooves are made in the shape of a right-angled triangle. 3. The method according to claims 1 and 2, tl and - 5, due to the fact that one of The faces of each grooves are perpendicular to the load line. five 0 five 0 ) Phage /  Rig. 2