Lumped and Consistent Mass Matrices - Quickfem
This is proven in the next Chapter. The most general method of this class uses finite element templates to fully parametrize the element mass matrix. For the prismatic 2-node bar element one would start with the 3-parameter template Me = ρA µ11 µ12 µ12 µ22,(31.9) which includes the symmetry constraint from the start.
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