Fatigue Failure and Fracture Mechanics by Edited by Dariusz Skibicki

By Edited by Dariusz Skibicki

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The curve is plotted according to the formula Ramberg-Osgood (1) calculating the new material constants, Young's modulus was obtained statically on 193GPa From the figure 1 it can be observed non-linear elastic character. Proposed division of the total strain amplitude of the ɛac for some ɛas linearly elastic, plastic and part of the ɛap coupled ɛsp. In order to preserve the forms hitherto used Ramberg-Osgood equation describing the cyclic deformation of the full use of them by adding the member responsible for the description of the coupled strain.

Regarding to the simplicity of IM and II models there are recommended especially in initial calculations realized in design process. The above recommendation is essentials also because of the smallest range of necessary experimental data that appear in descriptions of the mentioned models. e. One of the essential issues in fatigue life tests and calculations of structural materials and elements is the appropriate elaboration of loading spectrum and on its base the proper loading programme. For random loadings with wide spectrum the essential role is played by the assumption of the cycle accumulation method.

In the second case, the same linear hypothesis was considered, however parameter D can take values different than 1. In both cases, the fatigue life, N, was derived from the S-N curve of the form shown below: σ E0 = aN b (Eq. 2) where: σ is the maximum stress, a is the y-intercept of the obtained straight line, and b is the slope after linearization in bilogarythmic coordinates. Founded in the work method of calculating the S–N curve based on fatigue test results with stepwise load requires the determination of N in equation 1, based on the equation 2.

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