Essays about: "High cycle fatigue"

Showing result 21 - 25 of 30 essays containing the words High cycle fatigue.

1. 21. Development of a Shrouded SteamTurbine Flutter Test Case

   University essay from KTH/Kraft- och värmeteknologi

   Author : Ren Jinghe; [2017]
   Keywords : shrouded blade; flutter; hot-to-cold; CFD; höljet; fladdret; hot-to-cold; CFD;

   Abstract : A shrouded blade was designed as a test case for flutter analysis of steam turbine. Flutter is a self-excitedvibration. It can lead to dramatic blade loss and high-cycle fatigue. Shrouded blade is more complicated onflutter analysis, because the mode shapes are more complex with bending and torsion components atdifferent phases. READ MORE

3. 22. Fan Blade Vibrations in Synchronous Machines

   University essay from KTH/Energiteknik

   Author : Oskar Jonsson; [2016]
   Keywords : ;

   Abstract : The design of a fan structure should be made in relation to both an aerodynamic aspect as well as a structural point of view to avoid both self-excited vibrations and forced response. If the blades start to vibrate it can cause high cycle fatigue until they break and cause severe damage. READ MORE

4. 23. Wear mark evolution and numerical study of impact stresses in stainless steel flapper valves

   University essay from KTH/Materialvetenskap

   Author : Jesper Larsson; [2016]
   Keywords : Flapper valve; FEM; Impact fatigue; Wear mark;

   Abstract : Compressors that are used in refrigerators and air conditioners usually have flapper vales made of martensitic stainless steel to control the flow of the refrigerant in the system. During service the flapper valves are affected by both bending and impact fatigue in the very high cycle fatigue (VHCF) range with billions of cycles until failure. READ MORE

5. 24. Validation of non-linear time marching and time-linearised CFD solvers used for flutter prediction

   University essay from KTH/Kraft- och värmeteknologi

   Author : Ruben Erives Anchondo; [2015]
   Keywords : Validation; flutter; linear; non-linear;

   Abstract : The turbomachinery related industry relies heavily on numerical tools for the design and development of modern turbomachines. In order to be competitive turbomachines ought to be highly efficient and robust. This has lead engineers to develop more aggressive designs, which often leads to lower margins of structural reliability. READ MORE

6. 25. Thermo-mechanical fatigue of castiron for engine applications

   University essay from KTH/Maskinkonstruktion (Inst.)

   Author : Niklas Collin; [2014]
   Keywords : Thermo-mechanical fatigue; TMF; CGI; LGI; fatigue; thermal strain.; Termomekanisk utmattning; TMF; CGI; LGI; termisk töjning.;

   Abstract : In an engine component the repeated start-stop cycles cause temporal and local inhomogeneous temperatures, which in turn lead to a type of low-frequency loading, plastic deformation and eventually failure due to thermo-mechanical fatigue. Simultaneously, high-frequency mechanical loading arises from the cyclic combustion pressure and from road induced vibrations. READ MORE