R3DC Report 2-08

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Introduction

R3 Description

Geometry

2-D.jpg

Material Specifications

Material Youngs Modulus Density
MPa [math]\frac{kg}{m^3}[/math]
Polyeurethane Foam FR-3700 140 240
Hexacell with holes
Carbon Fiber Rods 210 580

Specific part Drawings

Endplate Deflection

Point Load Deflection

A simple calculation based on the definition of Young's modulus can yield an order of magnitude level estimate for the deflection of an endplate made from Aluminum. According to the definition of Young's modulus

[math]Y \equiv \frac{F}{4wy} \left( \frac{l}{t}\right )^3[/math]

where

[math]Y = 7 \times 10^{10}N/m^2 \equiv[/math] Young's Modulus for Aluminum
[math]F = 1027 N \equiv[/math]point force/load
[math]w =0.526 m \equiv[/math] width of the endplate
[math]y \equiv[/math] deflection of endplate due to point force
[math]l =4.83 m \equiv[/math] length of the endplate
[math]t = 0.05 m \equiv[/math] thickness of the endplate

A deflection of 6 mm is expected for a 5 cm thick Aluminum endplate, after solving the above equation for [math]y[/math] and inserting the given values. If a 5 cm thick stainless steel [math](Y=2 \times 10^{11} N/m^2 )[/math] endplate were used, the deflection would drop a factor of 3 from 6 mm to 2 mm due to the linear dependence of the deflection on Young's Modulus. The cubic dependence of the deflection on the thickness [math](t)[/math] of the endplate, however, can be used to reach the minimum endplate deflection criteria of 50 [math]\mu m[/math] instead of using stiffer material. Increasing the endplate thickness comes at the cost of increasing the end plate mass. As a result, composite materials were considered in order to minimize weight. The previous work of Kevin Folkman led to a similar conclusion.



Distributed Load Deflection

Distributed load FEA

Carbon Rod Buckling

Compression

Buckling Load Threshold

Buckling FEA

=3-D Analysis

Summary

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