Describe the differences between the wave forms resulting from a reflex stimulus with and without reinforcement. What can you hypothesize about the number of nerve fibers involved in a reinforced reflex as compared to one without reinforcement?
Triaxial compression tests are a common laboratory
technique for determining elastic properties and
strengths of rocks at various pressures p and temperatures.
Figure 3.6 is a schematic of the experimental
method. A cylindrical rock specimen is
loaded axially by a compressive stress σ1. The sample
is also uniformly compressed laterally by stresses
σ2 = σ3 < σ1.
Show that
ε2 = ε3
and
σ1 − σ2 = 2G(ε1 − ε2).
Thus if the measured stress difference σ1−σ2 is plotted
against the measured strain difference ε1−ε2, the
slope of the line determines 2G.
