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Reliability optimisation for the multi-contact connector system under fretting conditions

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Abstract

The harsh operating environments of many electronic systems, such as in the automotive and aerospace applications, make the semi-permanent connector terminal susceptible to intermittent failure or high contact resistance. Fretting, small cyclic movements at the contact interface, is exacerbated by oxidation to cause fretting corrosion, resulting in these types of failures. However, due to the fretting action, the contact does not remain in the failed state but often recovers to low contact resistance for a period before the next failure event. Improvements in reliability can be achieved by specific design considerations, either increasing the normal force of the contacts, or increasing the number of contacts per terminal or both. This paper shows the optimum design for the ratio of the total normal force (F) of all contacts and the number of contacts (n) per terminal, for one of the most popular contact materials used in connector technology. A model is developed, the optimum F/n Model, incorporating failure and recovery rates based on a theoretical understanding of the contact interface and experimental investigations. This is used to select the appropriate ratio between normal force and number of contacts per terminal (force/multi-contact, F/n) ratio for optimised reliability. A minimum in the unreliability function is found for particular values of force and contact number and recommended for optimum performance for the tin-plated system.

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Abbreviations

\(a_{\lambda }\) :

The failure coefficient

\(a_{\nu }\) :

The recovery coefficient

\(b_{\lambda }\) :

The failure exponent

\(b_{\nu }\) :

The recovery exponent

c :

Unit converter (100 gf to 1 N)

C :

The optimum force/multi-contact ratio

F :

Total normal force on a multi-contact terminal (N)

\(F_{1}\) :

Normal force of a single contact (N)

MCBF:

Mean cycle number before failure

MCTR:

Mean cycle number to recovery

n :

Number of contacts per terminal

R :

Reliability function, the probability that a terminal is in its working state at any point in time

W :

Unreliability function (\(1-R\)), the probability that a terminal is in its failed state at any point in time

\(\lambda \) :

Failure rate

\(\nu \) :

Recovery rate

\(\lambda (F)\) :

Failure rate force function

\(\nu (F)\) :

Recovery rate force function

References

  1. Bouzera A, Carvou E, El Abdi R, Benjemâa N, Tristani L, Zindine EM (2013) Study of minimum fretting for connectors used in automotive applications. Electr Eng 95(3):201–208

    Article  Google Scholar 

  2. Swingler J, McBride JW, Maul C (2000) Degradation of road tested automotive connectors. IEEE Trans Compon Packag Technol 23(1):157–164

    Article  Google Scholar 

  3. Gagnon D, Braunovic M (2001) Fretting in copper-to-copper contacts under AC and DC current conditions. IEEE Trans Compon Packag Technol 24(3):378–383

    Article  Google Scholar 

  4. Swingler J, McBride JW (1998) The synergistic relationship of stresses in the automotive connector. In: Proceeding of 19th international conference on electric contact phenomena, Nuremberg, pp 141–145

  5. Maul C, McBride JW, Swingler J (2001) Intermittency phenomena in electrical connectors. IEEE Trans Compon Packag Technol 24(3):370–377

    Article  Google Scholar 

  6. Swingler J (2009) Enhancing connector reliability by using conducting polymer materials to minimise contact fretting. Mater Design 30:3935–3942

    Article  Google Scholar 

  7. Antler M (1999) Tribology of electronic connectors. In: Slade PG (ed) Electrical contacts: principles and application. Marcel Dekker, New York, pp 309–402

    Google Scholar 

  8. Swingler J (2000) The automotive connector. IMechE Trans Part D 214(6):615–623

    Article  Google Scholar 

  9. Swingler J, McBride JW (2002) Fretting corrosion and the reliability of multi-contact connector terminals. IEEE Trans Compon Packag Technol 25(4):670–676

    Article  Google Scholar 

  10. Pitney KE (1973) Ney contact manual, Ney, pp 156–160

  11. Swingler J (1994) The degradation of electrical contacts under low frequency fretting condition. PhD thesis, Loughborough Univeristy

  12. Antler M (1982) Fretting of electrical contacts: material evaluation under fretting conditions. Special Technical Publications. STP780. In: Brown SR (ed) ASTM, New York, pp 68–85

  13. Malucci R (2001) Characteristics of films developed in fretting experiments on tin plated contacts. IEEE Trans Compon Packag Technol 24(3):399–407

    Article  Google Scholar 

  14. Malucci R (2003) Fretting corrosion degradation, threshold behavior and contact instability.In: Proceeding 49th IEEE Holm conference on electrical contacts, pp 2–15

  15. Andrews JD, Moss TR (2002) Reliability and risk assessment. Professional Engineering Publishing, London

    Google Scholar 

  16. O’Connor PDT (2001) Practical reliability engineering, 3rd edn. Wiley, Chichester

    Google Scholar 

  17. Myers M (2003) Coefficient of friction of Sn separable interface applications. Tyco electronics test report

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Authors and Affiliations

  1. School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK

    Jonathan Swingler

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  1. Jonathan Swingler
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Correspondence to Jonathan Swingler.

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Swingler, J. Reliability optimisation for the multi-contact connector system under fretting conditions. Electr Eng 99, 1–8 (2017). https://doi.org/10.1007/s00202-016-0369-2

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  • DOI: https://doi.org/10.1007/s00202-016-0369-2

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