Inextensibilty of a rod

[manoflogic-alt]

In any code how do I ensure that the rod that I am dealing with is inextensible. For example if I apply an axial compressive force to a cantilever rod, it should twist and bend instead of reducing in length. Please help me

[armantekinalp]

Hey,

In PyElastica, it is not possible to make rods inextensible. However, you can increase the axial stiffness of the rods so that they practically behave as if they have a large resistance to extension.

To achieve this, you need to modify the shear_matrix of the rod. For example, to increase the axial stiffness (E * A), after creating the rod, you can scale up the shear matrix as follows:

rod.shear_matrix[2,2,:] *= 10

This increases the rod's resistance to axial extension by 10 times.

[manoflogic-alt]

Thanks a lot