For space missions to either the Moon or Mars, protecting mechanical moving parts from abrasive effects of prevailing surface dust is crucial. This paper compares two lunar and Martian simulant regoliths using special pin-on-disc tests on a stainless steel/polytetrafluoroethylene (PTFE) sealing material pair. Due regolith particles entering contact zone, three-body abrasion mechanism took place. We found that friction coefficients stabilised between 0.2 0.4 for all simulants. Wear curves,...

We have investigated the sealing performance of different sealants and abrasive effect some Martian regolith simulants (MGS-1 JEZ-1) by pin-on-disc tests using steel various pin material pairs. Pin materials, representing sealants, were present in following two forms: block types, such as pure polytetrafluoroethylene (PTFE) composite PTFE, well braided pins, including hybrid PTFE. Friction resistance, wear, surface roughness, electron microscopy analyses used to evaluate tribological...

After cold plasma treatment of poly(ethylene terephthalate) and poly(ether‐ether ketone) surfaces by dielectric barrier discharge (DBD) under atmospheric (air) conditions, variations in surface chemistry, morphology were investigated relation with adhesion tribological properties. According to XPS measurements, oxidation caused the formation low molecular weight moieties carboxylic acids. The latter resulted more hydrophilic according water contact angle mainly a higher polar energy...

The present paper concentrates on the toughness and degree of crystallinity magnesium-catalyzed polyamide 6 rods cast in different diametres, which are commonly used for gear manufacturing. Its cannot be regarded as a constant feature due to casting technology. mechanical properties semi-finished products sensitive manufactured dimension, e.g., diameter, investigated by Charpy impact test tensile test. It is generally accepted that strength tensile-impact correlate with beside many other...

Tribological testing of moving shaft/sealing pairs in complex environments is at the frontline research. Machines working abrasive conditions are subject to different wear effects. It valid not only on Earth but especially for rovers and future robots used Mars Moon missions. The aim our joint research with European Space Agency study abrasion phenomena machine elements Moon, by using artificial soil samples (“simulants”). This review detail available simulant sources recommend a selection...

Abstract Global prominence has been attained by additive manufacturing technology in recent years, driven its environmental benefits and machining advantages when compared to traditional subtractive methods. Fused deposition modeling (FDM) technology, primarily utilized polymer composite 3D printing, allows for precise control of material distribution within components. In this study, mechanical tribological behaviors 3D-printed structures are investigated, yielding valuable insights...

Nowadays parts made of up-to-date engineering plastics are used more and in mechanicalengineering practice. These machine-elements produced most frequently by injection molding or onecutting process. The technology generally for great number pieces, case ofserial production while cutting processes preferred to piece (unit) smaller production.We lathe measured the main- feeding-directional force at different engineeringpolymers (cast PA6, POM C UHMW PE, HD 1000). We compared these results...

Two different test systems were designed to evaluate the tribological behavior of five engineering plastics (Polyamide-PA grades and Ultra High Molecular Weight Polyethylene-UHMW-PE) a fully degradable bio-composite (Polylactic Acid-PLA/hemp fibers) targeted agricultural machinery abrasive conditions. Pin-on-plate tests performed with loads, sliding velocity particles. The material response was further investigated in slurry containing system velocities distances, media compositions impact...

Tribological performance of the materials greatly depends on temperature contacting zones and surfaces hence heat conducting behaviour materials.Heat conduction polymers is, however, affected even by a very narrow (few tens nm) modified layer formed surface after subjecting polymer to plasma treatment.In this article flow inhibiting properties layers were investigated polyethylene terephthalate (PET) polyamide-6 (PA6) engineering polymers.Nitrogen Plasma Immersion Ion Implantation gave rise...

Coefficients of friction and wear lifetime for machine elements are usually estimated from pin-on-disc tests under fixed test conditions. The experimental design a tribotester with variable sliding path, dynamically changing normal loads, velocities is presented in this paper together preliminary evaluation properties engineering polymers. dynamic loading mechanism control the motion detailed. importance testing illustrated polyamides polyacetals pure, internally lubricated glass...

The wear behaviour of two martensitic and one multiphase steel targeted for abrasion erosion applications in agriculture mining industry were investigated three abrasive test systems with different complexity. Scratch tests performed indenter radii, shapes, loads. material was also multi-asperity contact systems. Pin-on-disc various loads particles, as well slurry-pot sliding velocities, distances, impact angles the media performed. Comparing systems, tested materials ranked similarly based...

In the initial stage of abrasive wear process, microtopography steels drastically changes until it reaches a stable state.This can be described by 3 dimensional roughness parameters.To predict these parameters, simulation algorithm has been developed which was validated tests.The applied load and length path varied in wide interval during experiments.The 1.1191 steel specimen worn using an ISO 6344:1998 paper with mesh size 1200.It found that both experimental results modelled same manner,...

In place of brittle ceramics used so far have appeared up-to-date called tough ceramicmaterials resisting better against mechanical effects [6]. Such material is the zirconium-dioxide, too. Theimportant advantage hard-turning applicability universal tool. Various outlines can be formed bya tool given. Machining in case using traditional machining (turning, milling, drilling) requiresspecial technological conditions (tools, machine-tools, parameters, etc.) which are developingpresently [2]....

During the turning process, we have investigated problems that can arise, such as avoiding formation of flowchips, which are eliminated by sawing workpiece longitudinally. Furthermore, measured main cutting forcesacting on blade and forces in feed direction at different rates, depths grip speeds,and possible correlations between these.Chips produced parameters with materials were investigated. All operationsare carried out without emulsion all other coolants for environmental reasons.The...

During the turning process, we have investigated problems that can arise, such as avoiding formation of flow chips, which are eliminated by sawing workpiece longitudinally. Furthermore, measured main cutting forces acting on blade and in feed direction at different rates, depths grip speeds, possible correlations between these. Chips produced parameters with materials were investigated. All operations carried out without emulsion all other coolants for environmental reasons. The specific...

Ebben a tanulmányban pultrúzióval előállított, üvegszálas, lapos profilokon lézeres felületkezelés hatékonyságát értékeltük. A kísérletekben Coherent Monaco 1035-80-60 femtoszekundumos lézert használtunk, ahol fő paraméter lézer teljesítménye volt. Az így kezelt próbadarabokat Olympus OLS5000 konfokális mikroszkópon vizsgáltuk meg, lézernyaláb által kialakított árkok mélységét és területét mértük. adatokat teljesítmény függvényében grafikonon ábrázoltuk. Eredményeink azt mutatják, hogy...

In this study, we evaluated the effectiveness of laser surface treatment on flat, glass fiber-reinforced profiles produced by pultrusion. The experiments used a Coherent Monaco 1035-80-60 femtosecond laser, where main parameter was power. treated samples were examined with an Olympus OLS5000 confocal microscope, measuring depth and area grooves created beam. data plotted as function Our results show that increase in is not proportional to power, while there close correlation between changes...