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Computational Structural Analysis of General Tetrapod Structure

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The primary objective of this analysis is to give insight and provide initial design guidance to improve the performance of the structure and dig out any potential problem in the structure. It will enable us to get an understanding of the actual behavior of the structure during the application of different types of loadings. Maximum Von Mises stress has been used as criterion to understand the mode and events of the deformation. The purpose is to keep the maximum stress below the material’s yield strength to elude the happening of structural failures. By testing the various configurations of the structure, we will get to know the best one that handles the applied load bearing minimum stresses thus decreasing the risk of structure failure. Finite Element Analysis FEA is a powerful tool to simulate the tests before the models are made. Two methods were opted to get the results applying the FEA technique by using MATLAB and ANSYS. The accuracy in both the cases depends on the extent of meshing and computational power provided.

Introduction

Everywhere in the world, we see different structures in which a beam assembly is used as a base and vertical columns are used as a support. There is conventional arrangement of base and supports. In our study we aimed to explain the effects produced on the stresses by changing the arrangement of beams and supports. After calculating the deflections produced by different configurations the configuration with the minimum deflection was identified. Finite Element MethodThe finite element method (FEM), is a numerical approach for the solution of problems involved in engineering and mathematical physics. Following is the list of some fields where FEM can be applied1. Structural analysis2. Heat transfer3. Fluid flow4. Mass transport5. Electromagnetic potentialThe Finite Element Method (FEM) is a way to numerically solve the equations governing the problems of physics and nature. Every phenomenon of the nature can be expressed in the form of equations. It basically solves the partial differential and integral equations.

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MATERIAL

Material has a vital role in the structural integrity of a structure. The material should be appropriate to bear the stresses with maximum loading conditions with minimum deflections. Different materials were investigated on the basis of their properties. Aluminum was used due to its easy machining, high strength to weight ratio and low cost. DIMENSIONS:The dimensions of the structure on which the analysis was done are:· For horizontal plane: 100 x 100 (cm2) with thickness 5 cm· For vertical support: 5 x 5 (cm2) with height 100 cm· Angle of inclination of each support = 45 degrees· E(Aluminum): 71Gpa· Load(N): 80kg=785N

METHODOLGY

Four types of configurations were made by using CATIA. These configurations are1) T-shaped base with vertical columns for support at each corner. [image: ]Fig 12) This is a X-shaped base with vertical columns for support at each corner. The tree of the above figure is showing that this structure is made by two functions i. e. pad and pocket. The thickness of the rods forming X of the base is not uniform. To maintain the symmetry, these rods are 0. 05m thick at the point of intersection but it becomes 0. 052m at till the corner of the rectangular base. 3) T-shaped base with inclined rods for support at each corner.

The tree of the above figure is showing that this structure is also made by two functions i. e. pad and pocket. But this thing is made after creating two different planes at specific orientations other than basic three axis. The purpose of forming these new planes is to generate the inclined rod supports for each corner. 4) X-shaped base with inclined rods for support at each corner. The tree of the above figure is showing that this structure is also made by two functions i. e. pad and pocket. But in this case both case 2 and case 3 are in the combined form. Like the base is just like that of case 2 and the lower supports are just resembled like case 3.

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