  In this paper, the template will be developed from an assumed Stress Method,
which its formulation is based on the Hellinger-Reissner principle developed
according to Kang's study in 1986. The element stiffness is decomposed into a
basic part that takes care of consistency and mix-ability, and a HO element
stiffness part that takes care of stability (also known as rank sufficient) and
accuracy. In the FE method, the HO stiffness is based on a displacement
formulation, whereas the basis stiffness is method independent. To start, one
should be familiar with the definition of a solid brick element. Solid brick
element is three-dimensional finite elements that can model solid bodies and
structures without any a priori geometric simplification.
