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nature : materials withstand repeated load capacity. Metals and polymer materials in forcing repeat, will cause mechanical damage and even decreased strength, fatigue of these materials is a very important physical performance. Usually fatigue test measured, and with the fatigue life and fatigue to characterize the former as certain repeat load, material damage to achieve the necessary number of cycles; As for the latter after a certain number of cycles required for the sample destroyed the greatest stress. The two ultra-high numerical, material fatigue resistance of the better. The loading fatigue test, the test materials are often different, such as rubber used fixed compression load test and flex cracking test, plastic bending fatigue tests while the majority.
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