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Tension, cyclic tension-compression and partial unloading tests for two types of cold rolled brass sheet (i.e. JIS C2600R-H, C2600R-1/2H) were carried out in order to investigate cyclic plasticity and unloading behavior, and to determine the plastic dependency on Young's modulus. The Young's moduli for the pre-strained materials were determined in different two ways. For the first case, unlading stress-strain...
The reliability of connector is depending on the contact force, generated by the spring in terminals of connectors. The springs are formed by stamping from a strip of spring material. Therefore, the prediction of its springback after stamping and force-displacement relation by the finite element (FE) simulation is important for the design of terminals. The mathematical model of stress-strain (s-s)...
In order to clarify the theory of contact resistance, there are many reports in these years. Mathematically the constriction current is derived from Laplace equation at one contact. And numerical approach for constriction current analysis was also preformed by Minowa and Sawada. Furthermore, as an experimental approach, Sawada et al. are successful in in-situ observation of current constriction inside...
Tin plated terminals are widely used for automotive connectors due to low cost and higher reliability. But it is observed that contact resistance of tin plated terminal increased due to fretting corrosion, which is originated from heat cycle or vibration. In order to clarify the degradation of terminal, it is necessary to obtain the contact resistance distribution on fretting corrosion wear of tin...
Adsorbed silicone vapor on contact surfaces decomposes typically to SiO2 by elevated temperature due to discharge or Joule heating. However, even if temperature is lower than decomposition temperature, weak decomposition is induced in very complex states. Namely, silicone molecule has an equilibrium reaction from linear molecular structure to ring structure, or its reverse reaction in the room temperature...
The reliability of connector is depending on the contact force, generated by the spring in terminals of connectors. The springs are commonly formed by stamping from a strip of the spring material. Therefore, the prediction of its force-displacement relation by the finite element method (FEM) is very important for the design of terminals. For the simulation, the accurate model of stress-strain (s-s)...
In order to clarify the theory of contact resistance, there are many reports in these years. Mathematically the constriction current is derived from Laplace equation at one contact which shape is circle, ellipse, triangle and square. And numerical approach for constriction current analysis was also preformed by Minowa and Sawada. Although there are many reports on the contact resistance measurement,...
For tin plated connector contacts, it was found that friction coefficient of the lubricated contacts was higher than that of non-lubricated contacts. This is very different from common knowledge of lubrication. In this paper, size of true contact areas of static contact condition was discussed by FEM analysis under conditions for both lubricated and non-lubricated contacts between platinum (Pt) hemisphere...
Theoretically the Laplace equation can be used to calculate the current constriction behavior in electrical contacts. On the actual behavior of current constriction, although there are many reports on the contact resistance measurement, not many reports on the detailed behavior of current density distribution in the contact area experimentally. Therefore, we attempted to observe the behavior of the...
It is observed that contact resistance of tin plated contact in automotive connectors increased due to fretting corrosion, which is originated from heat cycle or vibration. In this study, the measurement condition is established to obtain the contact resistance distribution on fretting corrosion trace of tin plated contact in order to clarify the relationship between contact resistance and oxide formation...
The reliability of a connector depends on the contact force generated by the spring in the terminal of a connector. The springs are commonly formed by stamping from a strip of spring material. Therefore, the prediction of the force - displacement relation by the finite element method (FEM) is very important for the design of terminals. For simulation, an accurate model of stress-strain (s-s) responses...
In recent years, there has been increasing demand to miniaturize wiring harness connectors in automobiles due to the increasing volume of electronic equipment and the reduction of the installation space allocated for the electronic equipment in automobiles for the comfort of the passengers. With this demand, contact failure caused by the fretting corrosion seems to become a serious problem in the...
A tin (Sn)-plated surface Is usually covered with tin oxide film such as SnO. The tin oxide film influences greatly contact resistance characteristics. Therefore, it is important to study contact resistance characteristics under low contact load. In this study, a growth law of the oxide film (relationship between film thickness and exposure time) was found for exposure temperature range from 25°C...
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