Mag. Anže Čelik, univ. dipl. inž., Poclain Hydraulics, d. o. o., Žiri;
Prof. dr. dr. Boris Jerman, univ. dipl. inž., izr. prof. dr. Franc Majdič, univ. dipl. inž., oba Univerza v Ljubljani, Fakulteta za strojništvo

Abstract:

The paper shows and explains experimental activities, performed to evaluate mechanical response of non-standard plug as a consequence of different loading type. In-depth understanding of plug behavior helps to setup design guidelines for such components.

In the first step, different sizes of existing non-standard plugs have been selected in order to take into account the size effect. Then, three different materials have been selected in order to evaluate effect of plug material. For the purposes of experimental evaluation and comparison with numerical approach, selected plugs have been additionally modified to allow installation of strain gauges.

Numerous experimental activities have been performed with the aim to evaluate induced stresses and preload forces due to tightening torque, contact forces and piloting pressure due to spool shifting, etc. Tests have unrevealed several details regarding mechanical response on plug that have not been known previously. New obtained knowledge helps to define plug design guidelines more appropriately.

Keywords:
non-standard plug, experimental investigation, preload force, tightening torque, design guidelines