In this paper, we write about EDISON program. We study about where to use this program. We can use this program for FEA naturally. But we study that using this program in class. Many students can't understand many machanics of materials' problem. They want to see image such as change of beam. It can help students to understand many problem. We can use ANSYS or Abaqus. But EDISON program is better for students because of it is freeware. In this paper, I write two problem. One is peak stress of basic beam, another is shearing stress flow of I-beam. On the basis of this, EDISON program will be widely used.

In this paper, the cross section properties of thin walled beam are calculated through KSec2D in consist of Saint Venant theory. To investigate tendency increasing the thickness, we analysis cross section using istopic material. In the asymmetric cross section, We investigate effect caused cross section properties accompanied increasing the thickness. The structural properties such as bending stiffeness, tosion stiffness per area of each cross section in three cases is compared through increasing thickness. The warping displacement calculated by KSed2D is modeled by CATIA. In order to show that warping influence the cross section, the warping shape modeled CATIA is printed 3D printer.

On wide variety of fileds, studies on active twist control are becoming more active, For effective twist control, blas have to have low tosional stresses with high torsional deformations to the same magnitude to the same magnitude of torque acting on its cross section. In this study, 2D sectional analysis and 3D finite element analysis were made for 5 different blades with each having different cross sections which have different spas, The results from 2D sectional analysis, were then put into 3D blade deformation and stress calculations which lead to analysis. Outcomes from 2D and 3D analysis, showed that on the same torque and concentrated load conditions, the blade with "C" shaped spar was the best of all the blades which were used in this study.