STUDY CASE OVER AN AGRICULTURE SPRAYER EQUIPMENT USING MULTIAXIAL FATIGUE CRITERIA COMPARED WITH EXPERIMENTAL RESULTS.

Resumo

In many situations in engineering, the fatigue phenomenon determine the catastrophic collapse of the
structure generating a significant loss in material resources and human life. The analysis of the real problem is in
general complex. On the other hand, the classic fatigue criteria approach is reasonably well established.
However, the methodologies based on these criteria are not applied directly when some complexities are part of
the problem. Examples such as the excitation generated by multiaxial stress or strain states, ; the proximity to the
weld region; among other situations that could happen in real problems. In the present case, a component of an
agricultural sprayer is analyzed. Over the cited structure, an experimental verification was carried out. Also, a
finite element method was applied to determine the level of stresses/strains in the critical region. In the present
work, different fatigue multiaxial criteria, Findley; McDiarmid; Brown and Miller, Fatemi and Socie and
Carpinteri Spagnoli were analyzed. The Wang Brown method was applied to count the equivalent cycles,
considering the multiaxial nature of the load history. Therefore, a comparison with real field observations could
be performed, leading to the evaluation of the proposed methodologies and their associated advantages and
disadvantages. Additionally, the implementation based on a nonproportional nature, considering the multiaxial
stress history, was developed.