MOIRCS support structure



MOIRCS Support Structure Analysis 2

tokoku

2002.6.12 update


 Analysis

1)overall


2) Diameter of support arms are 50 mm (2 inch).

3) Materials of main parts
       Aluminum(Al6061): dewar, support arms, optical bench
       Stainless Steel(304): top and bottom franges, gate valve
                             some mechanical components
       G10: support straps

4) Material Properties

Material	Temper	Density [kg/m³]	Young's Modulus[psi]	Poisson Ratio	Strength
Aluminum Al6061 @room temperature	Al6061	2.68*10³	10*10⁶	0.332	8-40 kpsi Yield strength
Stainless Steel @room temperature	SUS304	8.0*10³	29*10⁶	0.29	30(75-150) kpsi Yield strength
G10 @77K	Epoxy Glass-Fiber	1.88*10³	3.5*10⁶	0.12	40 kpsi Tensil strength

Results

----- Displacement ---------------------------------------------------------- When gravity direction is +X or +Y, maximum displacement are 1.06mm and 0.9mm respectively at middle of the bottom ring. 20 Colors of following figures(Fig1. and Fig2.) show displacement range from 0 to 0.1mm.

Fig1. Displacement when gravity direction is +X

Fig2. Displacement when gravity direction is +Y

Following figures(Fig3. and Fig4.) show rough configuration of displacements. Pink broken lines show exaggerated displacement.

Fig3. Displacement when gravity direction is +X

Fig4. Displacement when gravity direction is +Y

----- Stress ---------------------------------------------------------------- When gravity direction is +X, maximum stress is 3.4 kpsi at the lower arm joint (dewar side). Note that following indicated lebel of two figures are different.

Fig5. Stress when gravity direction is +X

When gravity direction is +Y, maximum stress is 4.2 kpsi at the lower arm joint (dewar side). Note that following indicated lebel of two figures are different.

Fig6. Stress when gravity direction is +Y

* 1 psi = 6895 Pa * click figures to enlarge