F (newtons) 83.5 18 203.1 70.5 29 77.1 60 30.5 51.7 50 40 45.1 29 62.5 54.9 13 78 109.0 86 318.5
From the work of D. C. Jillson, Trans. AIME 188,
1129 (1950), the following data were taken relating to the
deformation of zinc single crystals. The crystals have a normal cross-sectional area of 122 x 10-6 m2.
ϕ = angle between loading axis and normal to slip plane
λ = angle between loading axis and slip direction
F = force acting on crystal when yielding begins
a. Identify the slip system for this material.
b. Calculate the resolved shear τRSS and normal σn
stresses acting onthe slip plane when yielding begins.
c. From your calculations, does τRSS or σn control
yielding?
d. Plot the Schmid factor versus the normal stress P/
A0 acting on the rod. At what Schmid factor value
are these experimentally-measured yield loads at a
minimum? Does this make sense?
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