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The variable amplitude tests are based on measured rainflow data.
Constant amplitude tests were conducted at two different R-ratios (R = σmin/σmax) and the block amplitude tests involved two or more stress levels.
The model capabilities to predict variable amplitude tests are critically discussed by comparisons with experiments.
Variable amplitude tests highlight the nonlinear nature of the damage by fatigue of the SBR material.
Measurements of roughness of the surface fracture were carried out in both constant amplitude and variable amplitude tests.
Stress-controlled load increase and constant amplitude tests were performed on the cast magnesium alloy AZ91D.
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There are many publications about variable amplitude test results.
The results were compared with data achieved from constant amplitude testing.
Stress ratios were R = −1 for constant stress amplitude testing and R = 0.1 for fatigue crack growth testing.
The failure modes, S-N curve, and the constant life diagram under constant amplitude test are also discussed.
Therefore, this paper aims at presenting how spectra and test conditions should be clearly described and how statistics can be applied when variable amplitude test results are presented.
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