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A seven-member planar truss (with pin joints) is shown in Fig. 12.18. Each of the seven members has an area of cross section of and a Young s modulus of 207 GPa.
(a) Label the complete set of local and global nodal displacement degrees of freedom of the truss. Assume the X and Y coordinates shown in Fig. 12.18 as global coordinates.
(b) Find the coordinate transformation matrix of each member.
(c) Find the local and global stiffness matrices of each member.
a 2-cm long section of a 3-mm in diameter wire is maintained at a constant surface temperature of 370c. the wire is
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Measurements on the surface of a deformed sheet after unloading indicate that e1 = 0.154 and e2 = 0.070. Assume that the von Mises criterion is appropriate and that the loading was proportional (i.e., the ratio α = σy/σxremained constant during loadi..
A material has a strength coefficients K = 100, 000 psi Assuming that a tensile-test specimen made from this material begins to neck at a true strain of 0.17, show that the ultimate tensile strength of this material is 62,400 psi.
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