Both Link180 and SOLID185 elements have 3 degrees of freedom each (translation along the x, y and z) with no rotation allowed.
But why do both behave differently under applied load?
Why does SOLID185 "BEND" although it does not have translational degrees of freedom
But LINK180 does not bend under applied loads, like it deforms down but the element itself does not bend (the element stays straight without any curving)
Finite element model.
Dear Madam,
The reason may be because of geometric in variance also known as Pascals triangle. Due to polynomial orders of the element.
Simply, the two elments rely on a quite different theory. LINK is based on the beam theory (exact results) and can withstand only axial loads, whereas SOLID is a plane element that has interpolating functions (shape functions) and leads always to approximated results.
Shape functions for SOLID185 have such terms as x*y, x*z, y*z which generate quasi bending modes. But this element is unable to exactly reproduce pure bending deformation because of the lack of terms x^2, y^2, z^2.
Link is 1-D element based on beam theory. You can just have axial stress, while Solid is 3-D Homogeneous Structural Solid Element with stress in all axis, Furthermore , the degree of freedom of both is 3, but the behavior of each degree of freedom in both element is different.
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