Analiza vplivov na dobo trajanja plezalnih vrvi

Kovče, Urh (author), Nagode, Marko (mentor), Oman, Simon (comentor)

Dosedanje raziskave so preučevale, koliko na padec nosilnosti plezalne vrvi vplivajo različni faktorji, ki so jim vrvi izpostavljene med realno uporabo. Dokazano je bilo, da vsi faktorji skupaj v obdobju dveh let redne uporabe vrvi doprinesejo tudi do 35 % padca nosilnosti. V tej nalogi smo želeli preučiti ločen vpliv izbranih faktorjev, ki so po našem mnenju najvplivnejši. Na povsem novi plezalni vrvi smo v laboratoriju poskusili čim bolj realno simulirati različne stopnje obrabe in različne nivoje toplotne obremenitve kot tudi njune kombinacije. Simulirali smo tudi obremenitve, ki so posledica padcev in drugih načinov uporabe plezalne vrvi. Za pridobitev podatkov o nosilnosti testiranih vzorcev smo izvedli porušne natezne teste. Izkazalo se je, da linearno povečevanje stopnje obrabe ne povzroči tudi linearnega padca v nosilnosti. Kombinacija enake toplotne obremenitve na različnih nivojih obrabe rezultira v enakem padcu nosilnosti. Vzorci vrvi, ki so bili izpostavljeni najvišjim stopnjam obremenitve (obrabe in toplote), so dosegli 26 % padca v nosilnosti. Ugotovljeno je bilo tudi, da večkratne mehanske obremenitve, s katerimi smo želeli simulirati padce na vrvi, nimajo bistvenega vpliva na nosilnost. Predvidevamo, da je tak rezultat posledica našega postopka obremenjevanja.

• Language: Slovenian
• Keywords: plezalna vrv, stopnja obrabe, utrujanje, toplotna obremenitev, natezni preizkus, padec nosilnosti
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2024
• PID: 20.500.12556/RUL-160301
• Publication date in RUL: 25.08.2024

Secondary language

• Language: English
• Title: Analysis of the effects on the lifetime of climbing ropes

Abstract

Previous research has investigated the extent to which the drop in load capacity of a climbing rope is affected by the various factors to which the ropes are exposed in real use. It has been shown that all factors together contribute up to 35% of the drop in load capacity over a period of two years of regular use of the rope. In this thesis we wanted to study the separate influence of selected factors which we consider to be the most influential. In the laboratory, we tried to simulate the different levels of wear and the different levels of thermal load, as well as their combinations on a brand-new rope. We have also simulated the loads resulting from falls and other uses of the climbing rope. To obtain information on the load carrying capacity of the tested samples, tensile failure tests were carried out. It has been shown that a linear increase in the wear rate does not result in a linear decrease in the load capacity. The combination of the same thermal load at different wear levels results in the same drop in load capacity. The rope specimens subjected to the highest load levels (wear and heat) achieved a 26% drop in load capacity. It was also found that the multiple mechanical loads used to simulate the rope drops did not have a significant effect on the load capacity. We assume that this result is due to our loading procedure.

• Keywords: climbing rope, wear rate, fatigue, thermal load, tensile strength test, drop in load capacity