How to reduce electronic tensile testing machine test error>
Electronic Tensile Testing Machine is a high-precision material physical property testing device, with the highest domestic testing accuracy of 0.5, i.e. there is an error value of ±0.5% between the test result and the actual value, this error value is the possible error value when the test material reaches the ideal test condition allowed in the national standard and has something to do with the hardware conditions of the testing machine itself . connection, this is the responsibility of the manufacturer and cannot be controlled.
However, in actual operation, the error value of the test results of the electronic tensile testing machine increases due to various problems such as: B. Test Environment, Ttest method, device problems, etc. These are our It can be controlled in actual operation. If we want to minimize the test error of the electronic tensile testing machine, we can pay attention to the following conditions when conducting the test:
1. The temperature and humidity of the environment The electronic tensile testing machineThe temperature and humidity of the working environment of the electronic tensile testing machine have a certain impact on the electronic components, especially the humidity. If the value is too high, the electronic components of the instrument may experience unstable performance.
The temperature in the working environment also has a certain influence on some materials that are sensitive to temperature changes, so the temperature in the working environment of the testing machine must be kept at a constant temperature.
Solution: Install the electronic train ptesting machine as much as possible in a constant temperature laboratory. The temperature of the working environment should be kept around 25℃ and the humidity should be kept below 30%. .
Secondly, the influence of the mounts for electronic tensile testing machines
The choice of mounts for electronic tensile testing machines also has a certain influence on the test, for example parallel jaws are suitable Plates and sheets as well as wedge jaws are suitable It is impossible to solve multi-material testing with one jig to save the cost of testing machine for rods, rubber special jigs, textile special jigs and wire special jigs.
Third, the production of test pieces
The production of test pieces is as important as the testing accuracy of the electronic tensile testing machine itself. Producing samples that meet the testing standards can ensure that the conditions are metgen of each test are essentially the same. Only under nearly identical conditions can the test results of each test be essentially consistent and the test results be close to the true value.
Important points for sample preparation: metal test materials such as rods, plates, plastics, etc., need to thicken the two ends of the sample to form a dumbbell shape according to their own test requirements. The entire surface of the sample should be flat, without obvious problems such as trachoma, blisters and defects. For all samples, care should be taken to ensure that the dimensions are basically the same.
Fourth, specimen gripping
Correct gripping of the specimen also affects the test results. Regarding the tensile test, the direction of gripping the specimen must be parallel to the central axis of the electronic tensile testing machine, thus, when stretching the sample, the influence of the sample's own gravity, iEspecially of the tissue, is minimized, if improperly placed, this will be due to uneven application of force The specimen breaks out of the jaws, when a three-point bending test is performed, the specimen must be perpendicular to the central axis of the testing machine, and the specimen placement direction must be parallel to the be a device.