Hexahedral elements have proven to provide superior results to tetrahedral elements in certain types of complex finite element analysis (FEA). However, the development of a robust and complete hexahedral mesh generation scheme has been problematic. A need for tetrahedra-to-hexahedra (TTH) conversion software is identified, particularly for specialty codes not associated with typical CAD/CAM packages.; The development and testing of TTH software is presented. It uses the splitting method, a simple operation of dividing each tetrahedron into four hexahedra. Several mesh optimization routines are implemented at various stages of the program to improve the overall quality of the mesh.; As a whole, TTH is seen to have the capability of handling a variety of geometries incorporating features typical of FEA analysis. Although TTH cannot completely eliminate poorly formed elements the mesh optimization routines are effective at improving the overall quality of the mesh.
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