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Thus, if the sample is rotated by a certain amount of η around gφψ, depth profiles of the lattice spacing D (τ) are obtained even for the same orientation with respect to the sample system. 33 the penetration depth τ can be varied without changing Ψ. In addition, the Goodman diagram gives the allowable variation amplitude of repeated stress ( σ max, and σ min), according to the required fatigue life of the concrete, e.g. 17-6(a)), or give the fatigue life ( N) for predetermined variation amplitude of repeated stress ( σ max, σ min), e.g. Some of them give the fatigue strength of concrete for predetermined times of repeated stress, e.g. Various kinds of simplified formula or diagram are provided for checking the fatigue strength of structural concrete in the design codes of different countries. However, the fatigue strength of concrete under reversed tensile and compressive loads is smaller than that under a repeated tensile load. (2-11)), is consistent with that under axial compression ( f c f / f c). It is experimentally demonstrated that the relative fatigue strength of concrete under tension ( f t f / f t), including axial ( f t, Eq. 4 times per minute, as larger creep is caused.įatigue strength under tension. Nevertheless, the fatigue strength or life of concrete will reduce if the loading frequency is too low, e.g. The loading frequency during the fatigue test usually ranges from 100 to 900 times per minute, which has no obvious influence on the fatigue strength of concrete. For example, high-strength concrete contains less defects in the interior and has a higher relative value of fatigue strength, while light-weight (aggregate) concrete contains many porosities and more defects in the interior and has lower relative value of fatigue strength. However, these factors have obvious influence on the compressive strength ( f c) of concrete, which influences indirectly the fatigue strength. It is generally considered that many factors, including content of cement, water–cement ratio, kind of aggregate, curing condition, age at loading, of concrete do not have direct influence on its fatigue strength.
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Material composition and manufacture technique.
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S- N diagram for concrete prisms with different stress gradients