Modeling of the structures with three dimensional solid elements

In this study, a computer program has been developed to perform classical finite element analysis of structures. In the finite element analysis, 8 point solid element is used. It is not always possible to analyze the whole structure by modeling with 8 point solid elements at one time. Because for sufficient sensitivity, the number of elements required for the analysis nodes can be quite high. If the number of the nodes are excessive, linear equation sets that will emerge will be much higher than the computer memory capacity. In order to overcome this, the problem is solved by dividing the problem into sub-structures. For this purpose, a computer program is developed. Analyzes are performed on sample problems by using computer programs developed. The solutions of the sample problems are compared using finite elements of different sizes. It is seen that classical finite element software developed for eight-point solid element, gives results compatible with literature. However, as it is known, with the increase in the number of nodes, the memory capacity of the computer for classical finite element analysis is insufficient in some examples, while the time spent on the solution is quite high. If the structure is divided into sub-structures and analyzed, the amount of memory required is less. In addition, the time spent for analysis is found to be 3 to 74 times faster than classical finite element analysis. It is observed that the differences between the two analysis results remain between 0,0% and 6,91%. Within the scope of the study, it is concluded that substructure method for analysis provides very fast and successful results.