CHALLENGES AND NEW AREAS OF DEVElOPMENT FOR THE SPECTRAL METHOD OF FATIGUE LIFE ASSESSMENT
Journal Title: Journal of Machine Construction and Maintenance - Year 2018, Vol 109, Issue 2
Abstract
Many computer aided design methods that are being presented in the literature are using advanced fatigue life assessment methods. The problem with the assessment is especially interesting in the moment when the calculations are performed for random loads. In such cases it is common to use one of two calculation methods. The first one is based in the time domain and it uses cycle counting algorithms to assess the damage degree. The second is based in the frequency domain and it uses statistical information to assess the damage degree. Due to the emerging need of industry many fatigue life calculation methods have been developed for both domains. One of these methods is the spectral method for fatigue life assessment. The idea of this method is set in performing calculations in the frequency domain. That means that the operating information are the power spectral density and probability density function of loading amplitudes. Frequency domain fatigue life assessment methods have a young history compared to the time domain methods. Due to this fact many issues which have been solved within the time domain are still an unsolved issue in spectral method. That means that a certain question: why to use spectral method when it has many unsolved issues suddenly emerges. One of the simplest answers to that question is that spectral method is faster, which means that it is more time and money efficient. That was one of the main reasons to perform an analysis of issues that have to be solved, and awaiting challenges of the spectral method. Another question that had to be asked, in regards to the analysis: are there any areas where this method might be the only potentially applicable? The paper is divided into four parts that are taking these questions to further discussion. Some of the presented discussion points might be analyzed in both uniaxial and multiaxial loading condition.
Authors and Affiliations
Michał BöHM, Mateusz KOWALSKI
Keywords
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