Contact Resistance Law for Elasto-Plastic Domains in the Force Range (1mN-10N)(<Special Issue>Recent Development of Electro-Mechanical Devices (IS-EMD 2002))

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In this paper, we try to establish a power law for contact resistance versus force R_c = K_cF^<-n>_c, and we determine via experimental measurements and theoretical calculations, the constants n and K_c in the force range (1mN-4N) for bulk metal (Ag, Au, Pd, Ni) used in various applications (microswitches, connectors). The main experimental results of contact resistance are the occurrence of two decrease domains versus progressive load indentation. The first regime corresponds to the earlier touch of the coupon by the probe at force < 0.1N. This elastic regime evolves to a plastic regime for medium force > 0.1N. At the transition the exponent value n changes from 0.33 to 0.5 and induce K_c value increasing. Theoretical and computational approaches applied to the elasto-plastic model, confirm the occurrence of these two regimes. Although the calculated values of n are in good agreement with experimental values, some discrepancy between measured and calculated K_c values take place.
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2003-06-01