Electrical connectors for signal applications in the automotive sector are subjected to stringent requirements. These systems must ensure dependable signal transmission throughout the service life of a vehicle, even under high stress conditions. To this end, redundantly structured contact systems with several lamellas are often used. Stress due to vibrations during vehicle operation can lead to relative displacements between the electrical contact partners, especially in the resonant frequency range of the connector. Fretting corrosion then leads to increased electrical resistance at the connection and to failure of the system when a certain resistance threshold is exceeded. For studying the durability of electrical contacts, a fretting test bench was developed that allows the emulation of stress due to vibrations on a contact system with test frequencies of up to 300 Hz. The Wöhler model was used for describing the durability as a function of the relative motion. The test procedure and evaluation for determining the model parameters were based on the pearl string method. The test unit was qualified as electrically failed if the resistance exceeded the 15 mΩ threshold. The studies showed that the lifetime of the redundantly structured contact system can be described via an analytic approach based on the methodology for determining Wöhler curves. The distribution function was based on a logarithmic normal distribution. With the aid of scanning electron microscopic analyses in combination with element distribution images from energy dispersive X-ray spectroscopy, it was possible to attribute electrical failure to the oxidation of the base material in the wear track.
Inhalt
- Fachbeiträge/Technical Contributions
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Erfordert eine Authentifizierung Nicht lizenziertDurability studies on vibration-loaded electrical contact systems subjected to tribological stressLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertA new hybrid approach for reliability-based design optimization of structural componentsLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertInvestigation of the microstructure of dissimilar welds in duplex stainless steel and low alloyed steelLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertMicrostructure and fracture performance of 304 stainless steel laser repairs with Al2O3 nano-particlesLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertWet corrosion behavior of copper exposed to recycled groundnut oil as biofuelLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertNumerical and experimental performance evaluation of an innovatively manufactured centrifugal pumpLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertEffect of weld parameters on the microstructure and mechanical properties of dissimilar friction stir joints between pure copper and the aluminum alloy AA7075-T6Lizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertMechanical properties of waste mussel shell particles reinforced epoxy compositesLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertEffect of fiber length on the mechanical properties of banana fiber – vinyl ester compositesLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertEffect of rare earth elements on the microstructure and properties of a die-cast aluminum alloyLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertRelationship between MnS precipitation and respective effects of Ti-Mg bearing inclusions on the induction of intergranular acicular ferriteLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertInfluence of graphene coating on altering the heat transfer behavior of microprocessorsLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertMicrostructure and wear of FeCrC, SiC and B4C coated AISI 430 stainless steelLizenziert24. April 2019
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Erfordert eine Authentifizierung Nicht lizenziertPotentiometric studies on the influence of poly(N-vinylpyrrolidone) on the thermal degradation behavior of poly(vinyl chloride) blendsLizenziert24. April 2019