Repeat Prob. 326 with d = 16 mm, l = 3 m, and allow = 140 MPa.

Repeat Prob. 3–26 with d = 16 mm, l = 3 m, and σallow = 140 MPa.

Repeat Prob. 3–26, A diagonal aluminum alloy tension rod of diameter d and initial length l is used in a rectangular frame to prevent collapse. The rod can safely support a tensile stress of σallow. If d = 0.5 in, l = 8 ft, and σallow = 20 kpsi, determine how much the rod must be stretched to develop this allowable stress.