6.1

The rigid plate that is welded to the two bars in Figure P6.1 is rotated about the z axis, causing the two bars to bend. The normal strains in bars 1 and 2 were found to be ? ₁ = 2000 ?in/in and ? ₂ = ?1500 ?in/in. Determine the angle of rotation ?.

Figure P6.1

6.2

Determine the location h in Figure P6.2 at which a third bar in Problem 6.1 must be placed so that there is no normal strain in the third bar.

Figure P6.2

6.3

The two rigid plates that are welded to six bars in Figure P6.3 are rotated about the z axis, causing the six bars to bend. The normal strains in bars 2 and 5 were found to be zero. What are the strains in the remaining bars?

Figure P6.3

6.4

The strains in bars 1 and 3 in Figure P6.4 were found to be ? ₁ = 800 ? and ? ₃ = 500 ?. Determine the strains in the remaining bars.

Figure P6.4

6.5

Due to the action of the external moment M _z and force P, the rigid plate shown in Figure P6.5 was observed to rotate by 2 and the normal strain in bar 1 was found ? ₁ = 2000 ?in/in. Both bars have a cross-sectional area A = 1/2 in ² and a modulus of...