Quantifying Equipment Reliability
Key indicators for evaluating the performance of a tensile testing machine include force accuracy, displacement resolution, and test speed range. Force accuracy is usually expressed as a percentage of full scale; for example, ±0.5% means that the equipment's error does not exceed 0.5% within the maximum range. This indicator directly affects the reliability of the test data. Displacement resolution reflects the equipment's ability to capture minute deformations; high-resolution equipment can more accurately record the material's yield point. The test speed range determines the equipment's versatility; a wide speed range from 0.01 mm/min to 1000 mm/min can cover various testing scenarios from slow creep to high-speed impact. Users need to select performance parameters that meet their own testing standards (e.g., ASTM, ISO).