Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
FATIGUE LIFE PREDICTION OF A STRUCTURE SUBJECTED TO RANDOM LOADS AND STATISTICAL DURABILITY TESTS
Submission Author:
Vinicius Lugli , SP
Co-Authors:
Vinicius Lugli, Paulo José Paupitz Gonçalves
Presenter: Vinicius Lugli
doi://10.26678/ABCM.COBEM2021.COB2021-2070
Abstract
One of the most significant challenges for the industry is estimating the fatigue life of products during the design phase, when not all components of a product have been finalized and tested. The most widespread methods for structures fatigue life prediction are based on the Rainflow algorithm and time-domain, however, several researches are carried out to improve the efficiency of this process, as well as Dirlik's, which proposes to use the spectral-domain and a PDF. Thus, the main objective of this work is to evaluate two different fatigue life prediction methods through FEA, as a complement, a statistical durability test of the designed structure was developed using a hydraulic shaker. In addition to the durability results, the tests allowed the determination and calibration of structure's parameters that were used as FEA input. Through the FEA calculations and fatigue estimates, we concluded that the Dirlik method provides more severe fatigue conditions when compared to the Rainflow method, and both processes were less severe than the average results of the durability test. Considering satisfactory results for both processes, the spectral method becomes a feasible solution in determining the fatigue cycle of random and extensive time-history.
Keywords
Fatigue Life, Power Spectral Density, dirlik, Finite Element Analysis, probability density function
