Doctoral Thesis / Dissertation from the year 2012 in the subject
Engineering - Mechanical Engineering, grade: cum laude (gut),
Karlsruhe Institute of Technology (KIT), course: Mechanical
Engineering, language: English, comment: A computational approach
to thermomechanical fatigue life predictions of dissimilarly welded
superheater tubes, abstract: The primary focus of this work is to
investigate the influence of residual stresses on thermomechanical
fatigue (TMF) life predictions. Both experimental and numerical
methods have been adapted in order to predict the lifetimes of
dissimilarly welded superheater tubing in power plants. The fatigue
behavior and lifetime predictions of such components are
complicated at high temperatures since a complex interaction
between thermally activated, time-dependent processes are involved.
At the same time, components that operate at elevated temperatures
are often subjected to transient temperatures due to start-up and
shut-down where thermally induced cyclic stresses can occur. The
superposition of thermal transients with mechanical load cycles
along with unequal heating of parts of a component result in a
complex evolution of damage, leading to TMF failure of the
component. To add to the complexity, the degradation mechanisms
relevant to welded power plant components can be accelerated by the
presence of residual stresses.
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