A 30° rigid rotation read -13% strain — conjugate stress-strain pairs in large-strain shells
·8 min read
Rotation alone fabricates strain in the engineering measure, and a wrong stress-strain pairing shifts the internal work rate by 5% or 54%.
Thinner Means Stiffer — Shear Locking in Shell Elements and the MITC Tying Fix
·7 min read
A linear shell element gets stiffer, not weaker, as it thins out. The cause is one line: shear strain obtained by differentiating displacements.
Why Does the Bridge Sag Like That? The Direct Stiffness Method for Trusses
·4 min read
Assembling bar element stiffness matrices to solve truss displacements with FEM