1,721,009 research outputs found
On definition of intermittency phenomena in electrical connectors during low frequency fretting
No full textFretting is known to be a major cause of contact deterioration and failure in connector systems.
During fretting the contact resistance generally increases slowly with time. Superimposed on this
slow increase in contact resistance are rapid changes in contact resistance within fractions of a
second, called intermittences or short duration discontinuities. Consideration is given to the
evaluation of surface wear during the fretting process using a 3D laser scanner. The surface wear
of both plated and solid surfaces are related to the frequency of the intermittency events. High
speed measurements of contact voltage drop and contact current have been carried out and the
results are evaluated using general contact theory. It is shown that sudden changes in contact
resistance can be caused by the interaction of surface films and metallic contact combined with
the melting of current carrying asperities. The latter phenomena also accounting for volt drops
across the contact interface which exceed the melting voltage of the material
A model to describe intermittency phenomena in electrical connectors
No full textFretting is known to be a major cause of contact deterioration and failure, particularly in tin-plated contacts. During fretting the contact resistance generally increases slowly with time. Superimposed to this slow increase in contact resistance are rapid changes in contact resistance within fractions of a second, called intermittences or short duration discontinuities.Hi-speed measurements of contact voltage-drop and contact current have been carried out and the results are evaluated using general contact theory. It is shown that sudden changes in contact resistance can be caused by a surface film and by melting of current carrying asperities
Monitoring the connector environment in automotive systems
No full textThe connector environment in an automotive system has been investigated with regard to temperature, humidify and vibration. For this purpose 3 test car is being driven in a moderate environment in England and during a cold climate test. The obtained data allows the comparison between existing test procedures and real life data with the objective to improve connector reliability tests
Self-broadening and Shifting Coefficients for the Spectral Lines in the First Overtone Band of HBr
No full text
Temperature, humidity and pressure measurement on automotive connectors
No full textEnvironmental testing under laboratory-controlled conditions has long been used to evaluate connector performance prior to practical application. There are a number of experimental procedures frequently used in the automotive industry such as the USCAR standard for automotive electrical connector systems to test connectors. However, recent research has shown that these tests appear to evaluate the mechanical stability of the connector housings and terminals, rather than their electrical performance. In order to establish more representative tests to evaluate the electrical performance of contacts, the actual environmental conditions at the contact interface, which are generally unknown, must be measured. This work compares the temperature, humidity and air pressure inside the connector housing to those measured outside. It was found that the conditions inside and outside the connector housing are different and a model relating the conditions is introduced
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