The problems for Section 2.9 involve the determination of principal strains and maximum shear strain from measurements by strain rosettes.
Let the arm a of a rectangular rosette (Figure 2.20b) be directed along the positive x axis of axes (x, y). Using Mohr’s circle of strain, show that 2ϵxy = γxy = 2 ϵb − ϵa − ϵc.
FIGURE 2.20 Rosette strain gages, (b) Rectangular rosette.
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