Written in English
Thesis (Ph.D.) -Loughborough University of Technology, 1991.
|Statement||by Neil Andrew Stennett.|
Degradation Mechanisms: Loss in Contact Normal Force and a companion paper, “The Design of Separable Connectors” (DSC), found in Proc. 20 th Electronic Components Conference, , cite connector mating forces, mechanical wear, film/contaminant displacement, and accommodation of manufacturing tolerances as considerations that led to a minimum one Newton (N) ( grams) end-of-life contact force requirement. The contact normal force is the dominant design factor in determining the mechanical and electrical integrity of the connector. The loss of normal force from mechanical and/or environmental stresses may result in an increase in electrical resistance to excessive levels causing circuit faults, intermittence, or false triggering of logic. Abstract: Finer pitch, lower height, increased working range, and lower cost are clear roadmap trends for many connector systems. The reduction of contact normal force is a key enabler, if not necessity, to keep pace with these trends. Stable gold to gold milliohm level electrical contact can be made at N normal force and with wipe at the contact interface, the contact resistance can be. An electrical connector system having electrical contacts with reduced normal force is provided. The electrical contacts can define cantilevered beams of extended length, such that normal forces exerted by the electrical contacts on the electrical contacts of a complementary electrical connector are reduced.
separable electronic connectors (including both separable and non-separable ends of the connector) and signal contacts. The As normal force is a primary factor in the initial creation and maintenance of the electrical interface, a reduction in normal force due to stress relaxation may reduce the mechanical stability. This can. The normal force will start at zero, and will usually increase as the pin is inserted. The combined effect is to generate a peak insertion force much greater than the steady state condition, as shown in the red line in Figure 2. Conversely, the extraction force will never exceed the steady state force, since the normal force will help to. In this paper Kevin discusses how the forces resulting from the mating and the unmating of electrical connectors are a function of contact geometry, contact normal force, friction, and insulator binding or bottoming-out. Binding and bottoming-out are to . connectors, relaxation of the contact force due to high temperatures, and wear and/or fretting corrosion due to mechanical or thermal micro motions. Vibrations .
a closing force (F o) pushing against the diaphragm trying to close off the flow of gas. This force is calculated as: In normal operation, the diaphragm will sense the outlet pressure force change and provide a force to the linkage. The linkage moves to control the flow through the valve to maintain the set outlet pressure. For instance, if the. Reduction of the sliding amplitude when the normal force increases (accommodation). the use of connectors in electrical devices for automotive has significantly increased. This raise in the number of electrical and electronic devices on board has led to a growing number of breakdowns. a rise of the normal force tends to increase the. Simultaneously with the reduction of the sliding amplitude, the increase of the normal force leads to an increase of the tangential force (Q * = µ.P) (the fretting loop becomes “taller”). As previously mentioned, the ECR endurance depends directly on the wear rate and consequently on the friction energy (i.e. area of the fretting loop). Requirements of aluminum connectors for use with aluminum or copper conductors. 1. Adequate strength of the connector to prevent creep loss in the connection from exceeding the creep loss of the conductor. 2. Strong enough clamping force (torque) to keep the connector operating temperature at a .