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   Ó¢£ºthe variations of the strain amplitude of the four loadings were observed during the entire life.
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3.Ó¢£ºThe micro-cracks always initiates on the planes with maximum shear stress (strain) no matter whether the material is subjected to proportional or non-proportional loading.
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4.Ó¢£ºStage I takes most part of the fatigue life and it consists of two sub-stages.
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Stage I, which consists of two sub-stages, takes most part of the fatigue life.
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Stage I, which consists of two sub-stages, accounts for most part of the fatigue life.
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