The piezoresistance coefficients of copper and copper-nickel alloys.

This paper attempts to further a better understanding of the piezoresistance coefficients by studying the piezoresistive effects in copper and copper-nickel alloys. The experimental evidence of isotropic piezoresistance coefficients (π₁₁ = π₁₂) has been obtained for the annealed copper and copper-nickel alloys. The piezoresistance coefficients of the cold-worked copper and Cu₆₀Ni₄₀ alloy are of the tensor character (π₁₁ ≠ π₁₂). A physical explanation has been given to the change of the (π _ij) tensor. [ABSTRACT FROM AUTHOR]