09,11,2026 7 views
We know that environmental testing equipment can not only simulate phenomena such as temperature and humidity, light, rain, sand and dust, vibration, and impact in the climate environment, but also describe the performance characteristics of products in the short term through accelerated destructive testing.
ForVibration Test BenchIn order to limit the testing time, it is sometimes necessary to increase the severity level of the test to be higher than the actual dynamic conditions. By increasing the magnitude of vibration and increasing the mechanical stress on the sample, the fatigue life can be shortened.
Vibration Test BenchThe selection of acceleration factors in accelerated failure tests largely requires engineering judgment. The acceleration factors for different failure modes vary greatly and also depend on the structure of the sample itself (such as knocking caused by looseness, nonlinearity); Materials (processing marks, welding, heat treatment); Load and other environmental conditions. When using a high acceleration factor, some failure modes and locations that do not match the actual situation (GB/T2421) or important failure modes may be missed on the sample. For example, wear caused by looseness between components is suppressed by high-level tests that do not match the actual situation.
If detailed information on the sample, failure mode, damage location, stress at that location, material and its fatigue characteristic description (S/N curve) is known, a higher acceleration factor can be used. Referring to the stress cycle failure curve of the reference material, the actual number of cycles required to achieve failure can be selected by reducing the number of cycles and increasing the test stress level. For accelerated fatigue testing, it is recommended to use fixed frequency or resonant frequency sine excitation.
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