Q3. (a) A prismatic circular rod with one end fixed is acted on by the specified loadings as shown below. Discretise the rod with two equally long linear truss finite elements and calculate: (i) the global/system stiffness matrix and load vector, and (ii) the nodal displacements and element stresses. (b) The theoretically exact displacement, u(x), at any generic material point a distance x from the fixed end is given by the differential eqn. dx EA- du(x)]=1,(x), 0≤x≤L, with the boundary coditions, when x = 0, u(0) = 0, and when x = L, EA du(L) = P, and where dx E=30x106, A 2.0, L=60.0, ts(x) = 20.0/unit length, P = 50.0 Plot the variation of displacements of points along the length of the rod and critically compare these with your finite element results you have obtained in part (a). ts(x) +u(x) PX 475 Ans. 475x10 650×10-

Mechanics of Materials (MindTap Course List)
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Chapter2: Axially Loaded Members
Section: Chapter Questions
Problem 2.12.7P
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Q3. (a) A prismatic circular rod with one end fixed is acted on by the specified
loadings as shown below. Discretise the rod with two equally long
linear truss finite elements and calculate:
(i) the global/system stiffness matrix and load vector, and
(ii) the nodal displacements and element stresses.
(b) The theoretically exact displacement, u(x), at any generic material
point a distance x from the fixed end is given by the differential eqn.
dx
EA-
du(x)]=1,(x), 0≤x≤L, with the boundary coditions,
when x = 0, u(0) = 0, and when x = L, EA du(L) = P, and where
dx
E=30x106, A 2.0, L=60.0, ts(x) = 20.0/unit length, P = 50.0
Plot the variation of displacements of points along the length of the rod
and critically compare these with your finite element results you have
obtained in part (a).
ts(x)
+u(x)
PX
475
Ans. 475x10
650×10-
Transcribed Image Text:Q3. (a) A prismatic circular rod with one end fixed is acted on by the specified loadings as shown below. Discretise the rod with two equally long linear truss finite elements and calculate: (i) the global/system stiffness matrix and load vector, and (ii) the nodal displacements and element stresses. (b) The theoretically exact displacement, u(x), at any generic material point a distance x from the fixed end is given by the differential eqn. dx EA- du(x)]=1,(x), 0≤x≤L, with the boundary coditions, when x = 0, u(0) = 0, and when x = L, EA du(L) = P, and where dx E=30x106, A 2.0, L=60.0, ts(x) = 20.0/unit length, P = 50.0 Plot the variation of displacements of points along the length of the rod and critically compare these with your finite element results you have obtained in part (a). ts(x) +u(x) PX 475 Ans. 475x10 650×10-
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