Tensile test procedures are mainly prepared to test pieces, adjust the test machine, fixture test, inspection and testing, testing, recording test results and so on.
Tensile testing machine is also called universal testing machine, can be used for a variety of materials for tensile strength testing, compressive strength test, tear test, bending test and so on. So the tensile test procedures will be different. Now we introduce the tensile testing machine in the testing process of the main tensile test procedures.
1. Prepare specimens
With a scribing machine in the original gauge range within the circle (or with small steel hit a small punch), the gauge is divided into equal length of 10 cells. With the vernier caliper in the original gauge of the specimen at both ends and the middle of the two perpendicular to the direction of each measured diameter, whichever is the arithmetic mean as the diameter of the section, and then use the three cross-sectional diameter of the minimum value to calculate The original cross-sectional area of the specimen (Take three valid numbers).
2. Adjust the test machine
According to the tensile strength σb of the low carbon steel and the original cross-sectional area to estimate the maximum load of the specimen, configure the corresponding pendulum and select the appropriate measuring force dial. Start the test machine, so that the table up about 10mm to eliminate the impact of the table system weight. Adjust the active pointer at zero, driven pointer and active pointer closer, adjust the automatic drawing device.
3. Install the specimen
The specimen is first clamped in the upper chuck, and then the lower chuck to move to the appropriate clamping position, the final clamping the lower end of the specimen.
4. Check again measured
Please instruct the instructor to check the above steps to complete the situation. Start the test machine, preload a small amount of load (load corresponding to the stress can not exceed the proportion of the material limit), and then unloaded to zero to check the work of the test machine is normal.
5. Test Procedure
Start the test machine, slowly and evenly load, carefully observe the force pointer rotation and drawing device drawing the situation. Note that the yield value is captured and recorded to calculate the yield point stress σS. The yield stage is observed to observe the slip phenomenon. After the yield stage, the loading speed can be faster. Will reach the maximum value, pay attention to observe the "necking" phenomenon. Immediately after the test piece is stopped, record the maximum load value.
6. Remove the test piece and the recording paper
7. Measure the distance from the vernier caliper
8. Measure the minimum diameter d1 of the necking with a vernier caliper
9. The end of the experiment
Please instruct the instructor to check the test record. Will test equipment, tools, recovery, clean up the test site
10. Finally, organize your data, complete test report
In fact, in the actual test, due to the difference between the test material, the reference standard is different, the manufacturer tension machine is not the same, the universal testing machine testing procedure will be different.
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