Given: In the Midwest, hay bales are
often baled into round bales. A typical hay bale may have a radius of
4 ft. The hay bales are held together using a steel baling wire with a
1/16" diameter and Young's modulus of E = 25 Msi.

Req'd:
Determine the maximum tensile strain in the baling wire e_{max}.

Sol'n: Strain due to bending is given by:

e = –y/R

Here, y_{max} = ±(t/2) = –1/32 in. and R = 4 ft = 48 in. Thus: