Eventos Anais de eventos
MECSOL 2019
7th International Symposium on Solid Mechanics
Sensitivity Analysis of Load Frequency and Number of Block Cycles on the Fatigue Limit Measurement by Thermographic Method
Submission Author:
Paulo Pedro Kenedi , RJ , Brazil
Co-Authors:
Carlos Filipe Cardoso Bandeira, Florian Alain Yannick Pradelle, Paulo Pedro Kenedi, Jaime T P Castro
Presenter: Carlos Filipe Cardoso Bandeira
doi://10.26678/ABCM.MECSOL2019.MSL19-0068
Abstract
The fatigue limit is an important material property used for design purposes. The thermographic method was developed to evaluate this parameter in an optimized way, since the traditional techniques are expensive and time consuming. This technique correlates temperature increments with several loading amplitudes and estimates the fatigue limit as the stress below which no heat significant is generated. It depends on the number of cycles at each load increment and on the load frequency, to have a minimum heat generation for a good thermo-data acquisition. This work proposes a sensitivity analysis of both factors to determine their effects on fatigue limit measurements by the thermographic method. An experiment made using the full factorial design 22 has its data robustness checked with a variance analysis. The results show that fatigue limit measurements by the thermographic method have little dependence on both factors for the proposed experimental domain. In fact, it is more dependent on the incremental load cycles than on the applied frequency, since it delimits the loading application time and, consequently, the heat generation. The analysis of variance shows a good correlation coefficient between the experimental results and the design of experiment implemented.
Keywords
Fatigue Limit, thermographic method, Design of Experiment
