Rubber elastic component bonding strength testing machine, rubber elastic component bonding strength test bench, rubber elastic component bonding strength testing equipment test environment: Synthetic Cutting Oil,Soluble Cutting Fluid,Synthetic Cutting Fluid,Water Soluble Cutting Oil FRANCOOL TECHNOLOGY (SHENZHEN)CO., LTD , https://www.francoolcn.com
1. The test should be carried out in a room at a constant temperature of 23 ° C and 12 ° C.
2. It can be carried out at room temperature 5 °C - 35 °C without constant temperature. Or after the standard temperature environment is adjusted, the test piece is taken out and the test is completed within 30 minutes.
3. Special environmental tests should be carried out in an environmental chamber (such as high and low temperature environmental chambers), and the test piece should be balanced with the set environment. The temperature deviation inside the environmental chamber should be within 2 °C, and the environmental chamber should have an automatic temperature adjustment device with an accuracy of 2 °C.
Environmental regulation:
1. The rubber test piece should be environmentally adjusted before the test. The standard temperature for adjustment is 23 °C and 12 °C.
2. At standard temperature, the adjustment time of the rubber test piece is generally not less than 24 h. It is necessary to use the test piece which is squeezed and loaded, and the time of putting it into the test tooling is determined by the client and the tester.
3. During the adjustment of the test piece, the entire surface of the test piece should be exposed to the adjustment environment as much as possible, and the test piece should be protected from various external forces and direct sunlight.
Test principle:
The test piece is the actual product. Vertical tensile force or parallel shear force is applied to the two outer joints of the test piece to determine the deformation of the test piece or the maximum force of the test piece. The maximum force per unit area of ​​the test piece is rubber and connecting plate. Bond strength.
Test equipment:
The test equipment shall have the function of measuring and recording the load and displacement. The upper limit of the test load shall be within the range of 20% to 100% of the range of the test equipment. The allowable error of the load measurement of the test equipment shall be within 1% of the indicated value of the test equipment, and the allowable error of the displacement measurement shall be within 1% of the maximum deformation of the test piece. . The ZCW-S/W electronic universal testing machine should be preferred.
experiment method:
1. Destruction test
If the rubber thickness of the rubber member is t mm (when there are two or more rubber thicknesses, whichever is the minimum thickness tmm), the specimen is generally loaded with the moving speed of the specimen holder at t mm/min until the specimen is broken. .
2, non-destructive test
Apply test load to the test piece and keep it for 3 min. The test load, the direction and method of load application shall be determined by the commissioning party according to the actual operating conditions of the rubber parts. Generally, the test load for the adhesion test between rubber and connecting plates is:
In the tensile test, according to the test load given in Table 1; in the shear test, 1/3 of the test load given in Table 1 is the test load; for the tensile or shear test, it is possible to use the compression test. The test load for the compression test is 3 times the test load given in Table 1.
Bonding area mm~2
Test load N
≤3000
2S
>3000-≤15000
1.6S
>15000-≤3000
1.2S
>30000
1S
Note: S is the bonding area between rubber and connecting plate
There are more than 2 bonding faces between rubber and connecting plate, and the minimum bonding area is used.
Table 1 Test load
test results:
1. Bond strength of rubber and connecting plate
The tensile strength is calculated according to formula (1), and the shear strength is calculated according to formula (2).
B=P/S..........................................(1)
T=P/S....................................(2)
In the formula:
B—the tensile bond strength of the rubber and the connecting plate, the unit is MPa (MPa);
The shear bond strength of T-rubber and connecting plate, the unit is MPa (MPa);
P—the maximum force value at the time of test load or test piece failure, in mega ton (MN);
S—The bonding area of ​​the rubber and the connecting plate, in square meters (m~2).
2. Representation of the type of test piece destruction:
R—represents rubber damage;
RC-- indicates the damage between rubber and adhesive;
CP one-to-one indicates cohesive failure of the adhesive;
M—represents the destruction between the adhesive and the metal.
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Rubber elastic component bonding strength test method