Sökning: "Very high cycle fatigue"

Visar resultat 1 - 5 av 9 uppsatser innehållade orden Very high cycle fatigue.

1. 1. Life and fracture in very high cycle fatigue of a high strength steel

   Master-uppsats, Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

   Författare :Daniel Karlsson; [2021]
   Nyckelord :Very high cycle fatigue; VHCF; Fractography; Fine granular area; FGA; High strength tool steel; Ultrasonic testing equipment;

   Sammanfattning : Classical fatigue models teach that there is an intrinsic fatigue limit for steels, representing a level of stress that is too low for regular crack growth where every cyclic load propagates a fatigue crack through the material. Modern application with extreme lifetimes has shown that fatigue will still take place in steels with stress levels well below the expected fatigue limit. LÄS MER

3. 2. Effect of dwell time on stress intensity factor of ferritic steel for steam turbine applications

   Master-uppsats, Linköpings universitet/Mekanik och hållfasthetslära

   Författare :Ahmed Azeez; [2018]
   Nyckelord :;

   Sammanfattning : In the transition from conventional to green energy production resources, steam turbines are used to satisfy the lack of energy during peaks in the demand times and the limited access of renewable resources. This type of usage for steam turbines makes them operate on a flexible schedule, which leads to unpredictable issues related to shorter component life and faster crack propagation. LÄS MER

4. 3. Software Benchmark and Material Selection in an Exhaust Manifold : Thermo-mechanical fatigue simulation of an exhaust manifold in AVL Fire M

   Master-uppsats, Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

   Författare :Oskar Rombo; [2018]
   Nyckelord :thermomechanical fatigue; TMF; simulation; viscoplastic;

   Sammanfattning : Today, there is a great focus on downsizing the engines, this means that the engines are made smaller in size but retain the same power. This in combination with the drive to increase the power of the engines has led to the engine components being exposed to high thermal loads. Today’s engines also use very high cylinder pressure. LÄS MER

5. 4. Minimizing Cooling Time for Diamond Anvil Cell Under High Pressure

   Master-uppsats, Lunds universitet/Mekanik

   Författare :Martin Edung; [2017]
   Nyckelord :Diamond Anvil Cell; FEA; FEM; Structural; Transient; Temperature; Ansys; Ansys WB; Machine Drawings; ESS; European Spallation Source; Technology and Engineering;

   Sammanfattning : The main goal of the project was to decrease the cooling time of a diamond anvil cell (DAC) by modifying an existing design. Modifications included change of materials, overall dimensions and a significant reduction of mass together with additional suggestions for decreased cool time. LÄS MER

7. 5. Extremvärdesanalys (SEV) av högkvalitativt verktygsstål : Uppskattning av maximal inneslutningsstorlek i pulverstål

   Kandidat-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

   Författare :Emil Pernefur; [2017]
   Nyckelord :Material science; Inclusions; Metallurgy; Tool steel; Powder steel; Extreme values analysis; SEV; Ultrasonic fatigue; VHCF; SS 11 11 16; Light-optical microscope; Scanning electron microscope; Materialteknik; Inneslutningar; Metallurgi; Verktygsstål; Pulverstål; Extremvärdesanalys; Ultraljudsutmattning; SS 11 11 16; Ljusoptiskt mikroskop; Svepelektronmikroskop;

   Sammanfattning : This work were requested by Uddeholms AB. Uddeholm is the worldś leading manufacturer of high performance tool steel for industrial tools. The company exists worldwide and is present in over 100 countries. One of the company’s main production processes is manufacturing powder steels with extremely high quality. LÄS MER