The accuracy level of the mechanical tensile testing machine directly determines the accuracy, repeatability, and credibility of the test results. It has a significant impact on scenarios that require quantitative analysis of material mechanical properties, such as research and development, quality inspection, and process validation. The specific degree and performance of the impact are as follows:

The core of the accuracy level affected by the direct deviation of core indicator values is the load indication error, which will be directly reflected in the calculation results of key indicators such as tensile strength and yield strength.

withFor example, testing the same copper strip with a tensile strength of 500MPa using a 0.5 level and 1 level testing machine:

The large indication error of the 0.5 level testing machine is ± 0.5%, and the deviation range of the test results is 497.5MPa~502.5MPa;

The maximum indication error of the Level 1 testing machine is ± 1.0%, and the deviation range of the test results is 495MPa~505MPa.

For indicators such as elastic modulus that are sensitive to changes in load and deformation, the impact of accuracy level is more prominent:The 0.2 level high-precision model can capture small load fluctuations during the elastic stage of materials, while the 1 level model may mask the true modulus variation pattern due to errors.

The repeatability error index in the accuracy level of the impact on the repeatability of experimental data determines the degree of dispersion of multiple test results for the same sample.

Repeatability error of 0.2/0.5 level testing machineless than or equal to0.2%/0.5%, the results of multiple tests on the same sample have minimal deviation, and the data can be used for quantitative analysis such as material formula optimization and process parameter adjustment;

The repeatability error of the Level 1 testing machine is ≤ 1.0%, and the fluctuation range of multiple test results is large. It is only suitable for qualitative judgment of "qualified/unqualified" and cannot support high-precision research and development data comparison.

Differences in impact on different application scenarios

High precision testing machine for indirect effects on biased load sensitive samples（Usually equipped with automatic centering fixtures and high rigidity transmission systems, it can reduce additional errors caused by load deflection; However, low precision models (level 1) often lack alignment design, and when the sample is clamped and skewed, the error will be further amplified, even leading to premature fracture of the sample and inability to measure the true mechanical properties.

summary

For high-precision demand scenarios (research and development, standard quality inspection): for each level of improvement in accuracy level (such as fromThe credibility and data value of test results will increase exponentially from level 1 to level 0.5;

For low precision demand scenarios (rough sampling):The Level 1 testing machine can meet the demand, blindly pursuing high precision will increase equipment procurement and maintenance costs.