The issues of fatigue life of structural components under random loading conditions are extremely difficult. This results from the probabilistic nature of the factors influencing it, which include design and technological features, as well as factors related to operating conditions. The latter influence the character of the random load, and thus the form of the load spectrum used in fatigue life calculations.The paper presents an analysis of selected operational load histories, which are the result of measurements, characterized by different spectrum widths. The adopted histories were subjected to so-called schematization performed using the full cycles count method.
The obtained sets of cycles for each of the histories allowed for the development of load spectra used in fatigue life calculations, along with a two-parametric fatigue characteristic and the Palmgren-Miner fatigue damage accumulation hypothesis.
EVALUATION OF RANDOM LOADING CHARACTER ON FATIGUE LIFE CALCULATION RESULTS WITH THE APPLICATION OF TWO-PARAMETRIC FATIGUE CHARACTERISTICS
Problems of machine components fatigue life in random loading conditions are extremely difficult. It results from probabilistic nature of factors that influence fatigue life including design, technology and service factors. The last ones influence random loading and as a consequence on loading spectrum applied in fatigue life calculations.
The paper presents the analysis of chosen operational loading courses that are a result of measurments, characterized by a different spectrum broad range.
Assumed courses underwent so called schematization process performed with the usage of full cycles count method. The obtained cycle sets, for each of courses, enabled to elaborate loading spectra used in fatigue life calculations along with two-parametric fatigue life description and the Palmgren-Miner hypothesis of damage accumulation. (…)
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Source: Logistyka Magazine