<a style="color:#000" href="https://www.tugraz.at/institute/ittm">Institute of Thermal Turbomachinery and Machine Dynamics</a></br><a href="https://www.tugraz.at">Graz University of Technology</a> https://aeroenginesafety.tugraz.at/ 2026-04-30T23:28:42+00:00 https://aeroenginesafety.tugraz.at/ https://aeroenginesafety.tugraz.at/lib/exe/fetch.php?media=wiki:logo.png text/html 2024-01-30T11:14:57+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?id=5:54:544:544&rev=1706613297&do=diff 5.4.4 Hydrogen Embrittlement Hydrogen embrittlement (also referred to as hydrogen embrittlement cracking HEC, hydrogen stress cracking HSC, and hydrogen-induced cracking HIC) is a type of fracture that occurs in certain metals due to decreased toughness resulting from the absorption of hydrogen. The brittle failing of the material is due to diffusion processes (<a id="influence-of-surrounding-and-operating-factors"></a><a id="diffusion-processes"></a><a id="effects-of-hydrogen-on-the-structur… text/html 2023-01-12T17:15:16+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?id=23:231:231&rev=1673543716&do=diff 23.1 Anti friction bearings/roller bearings 23.1.1 Basics and failure mechanisms <a id="failure-mechanisms-of-roller-bearings"></a> [ Failure mechanisms of roller bearings ] There is a multitude of specialist literature and articles (Lit. 23.1.1-22), which deal with the identifikation of failures on anti friction bearings (here named bearings) <a id="operation-influennces-of-main-bearings"></a><a id="damped-main-bearings"></a><a id="stresses-between-rolling-elements-and-race"></a><a id="fat… text/html 2023-01-12T15:19:08+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?id=start&rev=1673536748&do=diff Aeroengine Safety Problem Oriented Engine Technology for Professionals * Examiners * Consultants * Public Authorities and Agencies * Operators * Quality Assurance * Designers * Service and Maintenance Created by: [Axel Rossmann] Axel Rossmann text/html 2022-05-16T17:49:32+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?id=19:19&rev=1652723372&do=diff 19. The Maintenance <a id="quality-assurance"></a> [ Quality assurance ] Trying an aero engine specific definition of the term maintenance we find in the english language different notions and approaches. On this account in the following will be tried a differentiation with a definition of the terms which apply for this book. It's absolutely possible that we find in the specialist literature also explanations that aberrate. <a id="fundamental-terms-mro"></a><a id="maintenance-program-developme… text/html 2022-05-16T17:39:39+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?id=18:18&rev=1652722779&do=diff 18. Handling, Packaging, Transport, Storage <a id="handling-packaging-transport-storage"></a> When dealing with safety-relevant considerations, this issues of handling, packaging, transport, and storage of the parts during and after the finishing process are often neglected. This is a mistake, for these processes have a considerable potential for causing damage. Cases in which <a id="rotor-disks-as-example-for-handling-of-high-stressed-parts"></a><a id="storage-problems-of-parts"></a><a id="c… text/html 2022-05-16T17:38:21+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?id=17:175:175&rev=1652722701&do=diff 17.5 Reworking <a id="reworking"></a> The parts used in turbine engine construction are often very expensive. The costs of a finished part can often be comparable to a vacation (turbine blades) or a luxury car (exit housing, rotor). In addition, such complex parts require very long processing times, from months to years. If there are delivery delays, additional high costs can be incurred. This makes the reworking and use of flawed parts an attractive option where it is possible.<a id="minimiz… text/html 2022-05-16T17:34:02+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?id=17:174:174&rev=1652722442&do=diff 17.4 Marking Parts <a id="making-of-parts"></a> The identification of parts through direct part marking (DPM) is a pillar of quality assurance systems in engine construction. It makes it possible to identify, trace, and categorize engine parts during raw part production, finishing, reworking, quality assurance, and the determination of usage limits. If damages or problems occur, direct part marking provides the necesary conditions for estimating risks and targeted corrective measures.<a id="s… text/html 2020-08-18T18:31:25+00:00 vmostetschnig (vmostetschnig@undisclosed.example.com) https://aeroenginesafety.tugraz.at/doku.php?image=11%3Aplaceholder_11_engine-operation-behaviour-trends-peculiarities-problems.svg&ns=11&rev=1597775485&tab_details=history&media_do=diff&do=media <img src="https://aeroenginesafety.tugraz.at/lib/exe/fetch.php?w=500&amp;h=500&amp;tok=14db92&amp;media=11:placeholder_11_engine-operation-behaviour-trends-peculiarities-problems.svg" alt="placeholder_11_engine-operation-behaviour-trends-peculiarities-problems.svg" loading="lazy" width="500" height="500" />