Ausfallmechanismen, Ausfallmodelle und ...

Summary
In this thesis the failure and failure mechanisms of insulationdisplacement-connections
(IDCs) and press-fit-connections (PF-
Cs) under mechanical and thermal load are investigated as well
as methods how one can evaluate the reliability of these connections.
To this end new test concepts are developed, which for the
first time allow to distinguish between the different load types
and in addition permit testing of real connection geometries independent
of the product the connection is used in. Therefore
the load is directly applied to the connection. Using this method
the load amplitude can be chosen arbitrarily and is independent
of the ambient temperature. The observed conditioned failure
mechanisms using these novel test concepts pave the way to
next generation test procedures, which will enable to significantly
reduce development times for connections in the future.
After providing the reader with the theoretical concepts needed to
understand the experiments in the first chapter, the second part
is dedicated to getting a sound understanding of low-frequency
mechanical load on connections for a given displacement. The
failure mechanisms for this kind of load are studied in great
detail for four different IDCs and two PFCs. This analysis can
serve as a basis for evaluation and design of future connections
in any application.
Starting from the basic concepts on fretting corrosion the third
part of the thesis will deal with the predictability of the lifetime
of 1.5-mm-IDCs. For this purpose the force introducing the
load together with the deflection is monitored. The shape of the
force-deflection-diagram allows one to assign the different load
amplitudes to certain fretting regimes. This classification opens
up the possibility to get a good lifetime estimate already at a very
early stage of the load. To point out that this way to estimate