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    Understanding strain in stiffness matrix

    Hi djeitnstine, How do i relate (L'-Lo)/Lo with e=(u1-u2)/l ? if in equilibrium(tension/compression with X1=-X2, E and A are constant) U1 and U2 will be the same in magnitude but different in direction, what about in non-equilibrium(X1 not equal to -X2 ) state where the direction and magnitude...
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    Understanding strain in stiffness matrix

    Homework Statement node1 node2 O---------------------------------------O a rod with 2 nodes: x1=axial force at node1 x2=axial force at node2 u1,axial deflection at node1 u2,axial deflection at node2 l=elements length E=young's modulus...
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