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nature : inspection fatigue-resistant materials performance tests. Usually refers to the dynamic fatigue tests on the specimen that is imposed cyclic stress, the mechanical properties of the sample so weakened and damaged, thus strike the specimen fatigue strength, fatigue limit fatigue life equivalent. Equipment from the major categories can be divided into static form will change the amplitude and dynamic set-two categories. From Shi mode can be divided into compression, tension type, reverse type and sheared four. According to different experimental conditions can be divided into fixed-amplitude, fixed-stress, such as fixed-energy. By specimen deformation can be divided into different ways : Center site-flex, tension-compression, reverse or set point flex blocks. Different testing machine design different, fatigue properties of the sample evaluation indicators also varies.
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