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home / study / engineering / mechanical engineering / questions and answers / a 85 wt% cu – 15 wt% zn alloy rod with a manufactured ... Question A 85 wt% Cu – 15 wt% Zn alloy rod with a manufactured length of 40 mm has been elongated to 42.5 mm. Determine the hardness and tensile strength of the elongated rod.

Solution

% Elongation   = 42.5 - 40 / 40   = 6.25 %

For 6.25 % Elongation 85 wt % Cu - 15 wt% Zn rod from copper alloy tables we get

Tensile Strength   = 434 MPa

Rockwell Hardness =   R_B 73