PSI - Issue 35

Gaston Haidak et al. / Procedia Structural Integrity 35 (2022) 124–131 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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and ageing of these solid elements persist and lead to a substantial loss of energy and performance. In addition, it can lead to the destruction of slippers components. Many types of research have been conducted in this area. Some have effectively demonstrated the presence of elastic and thermodynamic deformation of the slippers and swashplate components. Other researchers (Bergada et al., 2012, 2010a, 2010b; Kumar et al., 2009) have also studied the hydrostatic and hydrodynamic behaviour and the flow process occurring within the axial piston machine. They experimentally demonstrated the enormous energy loss on the slipper/swashplate interface due to the leakage. The damage and failure mechanism on the slipper/swashplate interface comes from the nature of the slipper ’ s motion on the swashplate (Haidak et al., 2018; Ma et al., 2015) and lubrication failure on the other (Flegler et al., 2020; Haidak et al., 2019b, 2020; Lin et al., 2013). This requires a reliable understanding of the causes and origins of these defects. In this sense, a great deal of research was also carried out, firstly by analysing the thermoplastic model of lubrication of this interface and its impact on the elastohydrodynamic deformation(Hashemi et al., 2016; Schenk, 2014; Schenk and Ivantysynova, 2015); and the effect due to the structure of the solids themselves (Bhattacharya et al., 2016; Haidak et al., 2018). However, of all the works cited above, the damage and fatigue of the slipper were not taken into account. Therefore, we propose a model of damage and failure analysis of the slipper/swashplate set, taking into account the strain and fatigue of the slipper, as well as the experimental test. In addition, the lubrication process plays an essential role in this mechanism to minimise friction and possible contact between solids. For this reason, we have developed a rig test to understand the behaviour of the fluid during the regular operation of the axial piston machine. The following parts of this work will start with presenting materials and methods used, followed by the results and discussion and finally, a conclusion.

Nomenclature c p

Heat capacitance

Fluid film thickness [m]

h

MB Mixt Boundary NB Neuman Boundary P pressure [Pa] T temperature [K] T s T L Temperature of leakage [K] Oil viscosity [Pa.s] Rotational Angle [rad] 2. Materials and Methods. Temperature of solid [K]

The results of this work have mainly been done in two different parts, the simulation and experimental parts. For the simulation, part is subdivided into two subparts. First, the solid-body deformation and failure mechanism where the two pointed parts are slipper and swashplate as presented in Fig. 1; and the behaviour of the thickness of lubricant between slipper and swashplate.