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Aleksandras Stulginskis University

Lithuanian University of Agriculture

Albinas Andriusis

Juozas Padgurskas

Ramutis Bansevicius

Vytautas Jurenas

Audrius Zunda

Algimantas Bubulis

A device for evaluating working surface fretting wear characteristics comprises a bottom holder with a sample secured thereto, springs displacing in the X and Y direction, multilayer piezo elements moving in the X, Y, and Z directions, a housing, a top plate/holder, a linear air bearing housing, a spherical upper sample, a linear air bearing shaft, a three-way force sensor, a moving support of the flat air bearing and the flat air bearing housing, a high frequency generator, an amplifier, a controller, an electrical filter, a computer, a force sensor signal amplifier, and a flat air bearing. Instead of springs, it can comprise additional multilayer piezo elements moving in the X and Y directions. The device performs testing surface wear under conditions nearer to actual fretting wear conditions, continuously observing friction pair condition changes during testing and evaluating wear characteristics of the tested material more accurately.

Device for evaluation of the working surface fretting wear characteristics

A device to measure the influence of friction force on wear characteristics of a material surface comprises a case with a cover. A moveable element (MFE) of a friction pair is fixed on a shaft installed in the case or is made flat. A holder of another, pressed, element of the friction pair (NMFE) and a clamp which applies a regulated load on the NMFE holder are attached to the cover. The NMFE is fixed to a NMFE holder installed using separate piezo sensors for pressing force and friction force in a sensor holder, which is installed using two pairs of lateral piezo actuators and their preload devices in an actuator holder, which is installed using two pairs of horizontal piezo actuators and their preload devices in the holder, which is installed in the cover of the device with membranes.

Device for measuring the influence of friction force on wear characteristics of a material surface with high frequency loading force

A device for the measurement of the influence of friction force on the wear characteristics of a material surface comprises a frame with a cover. A shaft is installed in the frame. A moveable element of a friction pair is fixed on the shaft. A holder of a pressed element of the friction pair and a clamp which applies a regulated load on the holder with the pressed friction element are installed in the cover. The holder of the pressed friction element is installed in a holder frame with first membranes which allow the motion only perpendicular to the axis of holder frame. The holder-frame is installed in the cover also with second membranes that allow it to move only in its axial direction. The system of the membranes damps the impact of inertial forces on the friction pair.

Device for measuring the influence of friction force on the wear characteristics of a material surface

Growing community of inventors

Kaunas, Lithuania

Albinas Andriusis