Date of Award
Master of Science (MS)
Dr. Timo Heister, Committee Chair
Dr. Leo Rebholz
Dr. Hyesuk Lee
The elasticity equations describe how an elastic material moves under a force. An elastic material is one that returns to its original shape after the force is lifted. Modeling elasticity is useful in manufacturing applications such as suspension cables and nail bending, and biological applications such as weight on bones and tendons . In this thesis we study the modeling of nearly incompressible linearly elastic materials. A nearly incompressible material is one that does not change much under pressure. Linearly elastic materials exhibit small deformations under a force. Standard finite element methods do not work well on nearly incompressible materials when using the simplest form of the linear elasticity equations (the pure displacement form). Instead, they exhibit locking; in other words, they produce excessively small displacements on a coarse mesh. We examine several methods that fix this problem. One method is to use a different form of the linear elasticity equations that more closely resembles a Stokes’ formulation (the displacement-pressure formulation). This approach has theoretical support, but is somewhat computationally expensive. Another method is to use reduced integration for part of our equation. This approach has less theoretical support, but with the correct setups, this method is both cheaper and more accurate than the standard method, and solves the locking problem.
Cinatl, Emma, "Finite Element Discretizations for Linear Elasticity" (2018). All Theses. 2977.