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Question: 134 a structural system consists of three joined bars of...

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1.34. A structural system consists of three joined bars of different materials and geometries, as shown in Fig. 1-31. Bar images is aluminum alloy, bar images is cold rolled brass, and bar images is tempered alloy steel. Properties and dimensions of all three are shown in the figure. Initially, the entire system is free of stresses, but then the right support is moved 3 mm to the right whereas the left support remains fixed in space. Determine the stress in each bar due to this 3 mm displacement.

Ans. σ1 = 223 MPa

        σ2 = 178 MPa

        σ3 = 446 MPa

images

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