HYDRAULIC COMPONENTS FATIGUE ASSESSMENT BASED ON REAL-LIFE LOAD HISTORIES
Journal Title: ISB-INMA TEH AGRICULTURAL AND MECHANICAL ENGINEERING - Year 2017, Vol 0, Issue 1
Abstract
Many safety-critical hydraulic components in agricultural and other off-road mobile machinery experience static as well as time-varying loads and, obviously they undergo the latter during a major portion of their service life. Fatigue behaviour is, therefore, a key consideration in design and performance evaluation of hydraulic components. The durability evaluation of components based on experimental results obtained from field is timeconsuming and expensive, so simpler approaches that include a limited number of component verification tests have become popular. A problem that arises when studying the fatigue behaviour of such components with simpler approaches as mentioned, is the transferability of data from those limited number of verification tests, which provide real-life load histories (recorded data of load vs time that machine will experience repeatedly during service life) to be used in the accelerated test methods (laboratory environment) for validating the internal rated fatigue pressure (RFP) of components. The RFP is the pressure (component specification) which a component is verified to achieve with a known probability the rated life without failure. Derived from the know-how and experimental background of the authors, the paper describes a simple procedure for the assessment of hydraulic components against fatigue based on the real-life load histories of a predetermined machine application using fatigue damage and life prediction rules. Conclusions are (1) that real-life load histories can essentially be reproduced, equivalently in terms of damage produced and life obtained, by constant amplitude fatigue tests and (2) that this method not only permits to decide the design specification (pressure-life) of components already in serial production, but also of those components that are still in the design phase.
Authors and Affiliations
Pere Roquet Fernández, Juan Jose Perez, Esteban Codina Macia
Keywords
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