14 pin 13534591 Automotive Electrical Wire Harness Connector Plug Socket 1.2 Series

Electronic connectors in the low-voltage, low-current workplace, the insulation on the contact surface during the fretting process, the material is more harmful, and in the high-power power circuit, the insulation may be damaged due to electrical shock. removed, the effect on the circuit.
1.Electrical Contact Reliability Design
The focus of connector electrical contact reliability design is the design of the following parameters: contact resistance, insertion force, and contact positive pressure.
2.Contact resistance design
According to the electrical contact theory, the contact resistance R= RC + Rf + Rp, where:
Rp—conductor resistance, which is the sum of the ohmic resistance of the terminal and the lead-out wire, and its size depends on the material, cross-sectional shape and length dimension of the terminal and lead-out wire.
RC—concentrated resistance. When two terminals are in contact with each other, their surfaces cannot be in complete contact, and it is a point-to-point contact on a microscopic level. When the current flows from one contact to another, the current line is contracted to generate resistance, and the resulting resistance is called shrinkage resistance.
Rf—film layer resistance, which is the resistance produced by the adhesive film, dark film and thin film on the surface of the contact.
Influencing factors of contact resistance: the characteristics of the material itself, contact pressure, production process capability, etc.
Terminal material selection
resistivity of typical metals
properties of copper alloys
Selecting terminal materials with high conductivity or low resistivity (the conductivity of brass is about 13%, the conductivity of phosphor bronze is about 26%, and the conductivity of beryllium copper can be as high as 40%) is the most effective way to reduce contact resistance.
3.Basic requirements for terminal material selection:
(1)Conductivity - high conductivity, low resistivity, reduce contact resistance;
(2)Ductility - facilitates terminal molding;
(3)Hardness - improve mechanical wear ability and increase contact area,reduce contact resistance;
(4)Yield strength-yield strength is defined in mechanical and material science as the stress value at which the material begins to undergo plastic deformation (permanent deformation), and has a large displacement in the elastic range;
(5)Elastic modulus - The surface film with a higher elastic modulus is easy to damage, which is beneficial to reduce the contact resistance of the surface film, and a lower elastic modulus can increase the contact area of elastic deformation;
(6)Stress relaxation - the terminal is under stress or high temperature for a long time, and the resistance to load can still be maintained;
(7)Hardness (Hardness) - reduce the wear and tear of the terminal metal.

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