고체역학 (Beer) — Shearing Stresses in Beams: Problem 6.41

6.40 and 6.41 The extruded aluminum beam has a uniform wall thickness of $1/8$ in. Knowing that the vertical shear in the beam is 2 kips, determine the corresponding shearing stress at each of the five points indicated. (Note: Problem 6.41 refers to the closed two-cell rectangular box beam shown in the right-hand part of the figure for "Fig. P6.40" and "Fig. P6.41".) Given data for Fig. P6.41: Total width = $1.25\text{ in.} + 1.25\text{ in.} = 2.5\text{ in.}$ Total height = $1.25\text{ in.} + 1.25\text{ in.} = 2.5\text{ in.}$ Wall thickness $t = 1/8\text{ in.} = 0.125\text{ in.}$ (uniform) Vertical shear $V = 2\text{ kips} = 2000\text{ lb}$ Points of interest: $a, b, c, d, e$