MOIRCS Support Structure FEA 3 [ Delta-type ]

2002.9.26 update tokoku
2002.9.24


 ANALYSIS

Materials of main parts Aluminum(Al6061): Dewar, Delta plates, Optical bench, Top ring Stainless Steel(304): Gate valve, Cooler G10: Opt. bench support straps Gravity Directions g=-z .....Rest condition g= x .....Motor of gate valve looks to down g= y .....Mask dewar looks to down Material Properties

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

** Max. Displacement and Max. Stress include all of dewar **

	Gravity Direction	Max. Displacement [mm] where	Max. Stress [kpsi] where
[This FEA] Delta-Type	g=-z	0.07 End of Mask Dewar	0.71 Top end of G10 strap (upper/vert.)
	g=x	0.17 Upper of Side-Wall	0.68 Both end of G10 (lower/hor.)
	g=y	0.12 Lowest Lens weight	0.68 Both end of G10 (upper/hor.)
[Previous FEA] 8 + 4 Posts	g=-z	0.12 Lower Ring	0.35 Knot of Upper Short Posts
	g=x	1.06 Lower Ring	3.44 Knot of Lower Posts (dewar side)
	g=y	0.90 Lower Ring	4.12 Knot of Lower Posts (dewar side)




** Max. Displacement and Max. Stress only Optical Bench **

	Gravity Direction	Max. Displacement [mm]	Max. Stress [kpsi]
[This FEA] Delta-Type	g=-z	0.06	0.54
	g=x	0.16	0.45
	g=y	0.12	0.073
[Previous FEA] 8 + 4 Posts	g=-z	0.06	0.055
	g=x	0.20	0.435
	g=y	0.16	0.078