LAT-TD-046181 GLAST LAT Project Tracker Inner Shipping Container Analysis and Test Results Tracker...

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GLAST LAT Project

Tracker Inner Shipping ContainerTracker Inner Shipping Container

Analysis and Test ResultsAnalysis and Test Results

Tracker Inner Shipping ContainerTracker Inner Shipping Container

Analysis and Test ResultsAnalysis and Test Results

August 20, 2003

Michael OpieMichael Opie

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GLAST LAT Project

Side Drop Qualification and Vertical Lift Proof Test LoadsSide Drop Qualification and Vertical Lift Proof Test Loads

• Qualification for side loading due to side drop at 17.6 g

• Proof test for vertical lift load at 2g

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Side Drop LoadSide Drop Load

Side Impact Calcula tions

h 1.5ft drop height

Wb 170lbf

Wb 74.8kg g weight of object being dropped

K 3.5 360lb f

in st if f ness of impact surf ace

V h( ) 2 g h v elocity of object dropped f rom height h

F h( ) Wb 1 Wb2 K Wb V h( )

2

g Force at interf ace f or drop of height h

F h( ) 2.905 103 lb f

0 2 4 6 8 10 120

500

1000

1500

2000

2500

F plot in( )

lbf

plot

Fmultiplier h( )

Wb 1 Wb 2K Wb V h( )

2

g

Wb normalized weight mult iplier

0 5 10 15 200

5

10

15

20

25G vs Drop Height

Drop Height [in]

Acc

eler

atio

n [g

]

Fmultiplier h( ) 17 .615

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Vertical Drop LoadVertical Drop Load

Vertica l Impact Calcula tions

h 2.0ft drop height

Wb 170lbf

Wb 74 .8kg g weight of object being dropped

K 360lbf

in st if f ness of impact surf ace

V h( ) 2 g h v elocity of object dropped f rom height h

F h( ) Wb 1 Wb2 K Wb V h( )

2

g Force at interf ace f or drop of height h

F h( ) 1.861 103 lb f

0 2 4 6 8 10 120

500

1000

1500

F plot in( )

lbf

plot

Fmultiplier h( )

Wb 1 Wb 2 K Wb V h( )2

g

Wb normalized weight mult iplier

0 5 10 15 202

4

6

8

10

12G vs Drop Height

Drop Height [in]

Acc

eler

atio

n [g

]

Fmultiplier h( ) 11 .285

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Side Drop Load SimulationSide Drop Load Simulation

• Qualification for side loading associated with side drop at 17.6 g

•9475 N (2130 lbf)

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Side Drop Load SimulationSide Drop Load Simulation

• Loading Procedure

•7901 N (1776 lbf) •9475 N (2130 lbf)

Load up to 7901 N without support at the end.

Continue loading up to 9475 N with support at the end.

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Test predictions: FEM MeshTest predictions: FEM Mesh

Node 70000

Node 70001

Node 90000

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Test predictions: Von Mises StressTest predictions: Von Mises Stress

Stress for load case 2Stress for load case 1

MS = 276/1.4/40.9 - 1 = 3.82 MS = 276/1.4/36.4 - 1 = 4.42

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Test predictions: Applied LoadsTest predictions: Applied Loads

R 1728NRM

L

M 639N mM waL

2

2

a 0m

wa 9340N

mwa

mass loadL

L 0.37m

load 17 .62g

mass 20kg

Shipping Container LoadingDistributed load simply supported in the middleThe same as distributed load over a half length cantilevered beamRoark Case 2a

M 2238N mM W L

L 0.37m

a 0m

W 6048NW mass load

load 17 .62g

mass 35kg

Tracker LoadingPoint load at center of canti levered beamRoark Case 1a

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Test predictions: Applied LoadsTest predictions: Applied Loads

– Load 1 is applied as an enforced displacement. This produces a force of 7901 N at the center of the container (node 70000) a moment of 2917 N-m at the support (node 90000).

– Load 2 is applied as a force of 1728 N at the free end of the container. This increases the load at the center to 9474 N but reduces the moment at the support to 2238 N-m.

– These are thus the required load combinations to produce a moment of 2239 N-m at the support, 639 N-m at the center.

F O R C E S O F M U L T I P O I N T C O N S T R A I N T

POINT ID. TYPE T1 T2 T3 R1 R2 R370000 G -9.473834E+03 -2.257536E-10 6.798473E-11 7.613243E-12 -4.523315E-11 -1.051426E-1070001 G 1.728000E+03 -5.002221E-12 -4.627765E-11 -2.591816E-13 5.776712E-12 2.504663E-1390000 G 7.745834E+03 -2.149392E-10 -2.552270E-10 2.669100E-10 2.238876E+03 -2.355747E-05

F O R C E S O F M U L T I P O I N T C O N S T R A I N T

POINT ID. TYPE T1 T2 T3 R1 R2 R370000 G -7.901346E+03 -5.255174E-11 1.659828E-11 1.312195E-11 -4.613554E-11 -8.171419E-1170001 G 8.541434E-11 -3.842260E-12 3.074874E-12 -3.346629E-13 9.135470E-12 2.196021E-1390000 G 7.901346E+03 -5.123866E-10 -2.969500E-10 4.729692E-10 2.916979E+03 -2.403050E-05

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Margins of Safety – Side Load LC 1Margins of Safety – Side Load LC 1

As F(y) F(u) F(y) F(u) Preload Torque Preload Load Bolt Friction SF(y) SF(u)mm^2 [MPa] [MPa] [N] [N] % of Yield [N-m] [N] [N] Efficientcy Coefficient14.9 344.7 689.5 5149 10299 65.0% 3.35 3347 8 1.00 0.15 2 319.6 189.585 379.225 3722 7446 0 2036

Bolt Interaction Helicoil Helicoil Plate Edge E/D Shear Shear MS Bearing Bearing MSMargin Fu Margin Thickness Distance Tearout Allowable Shear Allowable Bearing

[N] [mm] [mm] [MPa] [MPa] [MPa] [MPa] [MPa] [MPa]0.01 15791 0.57 3.18 12 2.4 26.7 186.2 1.33 128.1 606.7 0.580.56

Mass G-Loading Shear Load Axial Load[kg] [-] [N] [N]

74.80 17.62 2036 8

Part Description Material Load Case Failure Mode D dmm mm

LAT-DS-03949 TKR Inner Ship Assy 18-8 SS Mass = 74.8 Kg Tension 5.0 4.4DIN912-A2 M5 Soc Hd Cap Scr 100 ksi Ultimate 17.615G Side Load Shear 5.0 4.4

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Margins of Safety – Side Load LC 2Margins of Safety – Side Load LC 2


74.80 17.62 1806 8


LAT-DS-03949 TKR Inner Ship Assy 18-8 SS Mass = 74.8 Kg Tension 5.0 4.4DIN912-A2 M5 Soc Hd Cap Scr 100 ksi Ultimate 17.615G Side Load Shear 5.0 4.4




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Vertical Lift Load Proof TestVertical Lift Load Proof Test

• The following calculation shows the amount of weight that needs to be added for the proof load of the tracker shipping container vertical lift.

• Mass of TKR and Base Plate = (31.8 kg + 5.45 kg)*1.10 = 41 kg • Mass of Ship Container and Cable Hold. Plate = (27.9 kg + 3.03 kg)*1.10 = 34 kg

• Additional Mass for 2g lift = 2*(41 kg) + 34 kg = 116 kg = 256 lbf

• So we need to add an additional 256 lbf for the vertical proof load.

• Procedure

• Add 256 lbf (1139 N) of ballast.• Perform 4 point lift from corners.• Perform 1 point lift from center.

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Test predictions: Vertical Lift FEM MeshTest predictions: Vertical Lift FEM Mesh

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Test predictions: Vertical Lift Von Mises StressTest predictions: Vertical Lift Von Mises Stress

•Stress for vertical load case 2•Stress for vertical load case 1

MS = 276/1.4/16.5 - 1 = 10.9 MS = 276/1.4/20.8 - 1 = 8.48

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Margins of Safety – Vertical Lift LC 1Margins of Safety – Vertical Lift LC 1


74.80 2.00 252 0


LAT-DS-03949 TKR Inner Ship Assy 18-8 SS Mass = 74.8 Kg Tension 5.0 4.4DIN912-A2 M5 Soc Hd Cap Scr 100 ksi Ultimate 2.0 G Vertical Load Shear 5.0 4.4




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Margins of Safety – Vertical Lift LC 2Margins of Safety – Vertical Lift LC 2


74.80 2.00 306 7


LAT-DS-03949 TKR Inner Ship Assy 18-8 SS Mass = 74.8 Kg Tension 5.0 4.4DIN912-A2 M5 Soc Hd Cap Scr 100 ksi Ultimate 2.0 G Vertical Load Shear 5.0 4.4



[N] [mm] [mm] [MPa] [MPa] [MPa] [MPa] [MPa] [MPa]6.79 15791 0.57 3.18 12 2.4 4.0 186.2 14.47 19.3 606.7 9.50

11.14

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Calculations Showing Helicoil CapabilityCalculations Showing Helicoil Capability

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Minimum Margin of Safety SummaryMinimum Margin of Safety Summary

Load Description Failure Mode Yield Ultimate MS MSCase Factor Factor Yield Ultimate

Side 1 17.6g Side Drop 7901 N Cantilever M5 Bolt tension shear interaction 2.0 3.0 0.01 0.56Side 2 17.6g Side Drop 7901N Cantilever + 1574N SS at Center M5 Bolt tension shear interaction 2.0 3.0 0.19 0.83Vertical 1 2g 4-Point Vertical Lift M5 Helicoil pullout 2.0 3.0 NA 0.57Vertical 2 2g 1 Point Vertical Lift M5 Helicoil pullout 2.0 3.0 NA 0.57

Minimum Margin of Safety Summary

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Side Load Test ResultsSide Load Test Results

• Test equipment weighed 130 lbf. So the target loads where reduced to the following:

Load Case 1 = 1646 lbf (7322 N)

Load Case 2 = 2000 lbf (8896 N)

• Actual loads achieved during test where:

Load Case 1 = 1725 lbf (7673 N)

Load Case 2 = 2150 lbf (9564 N)

• The test resulted in no anomalies. Test deemed successful.

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Cable Holding Plate Mounted to Test FixtureCable Holding Plate Mounted to Test Fixture

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Displacement Gage to Indicate Slip Relative to Test FixtureDisplacement Gage to Indicate Slip Relative to Test Fixture

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Set-up for Side Load Case 1Set-up for Side Load Case 1

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Application of Force via Turn-buckle for Side Load Case 1Application of Force via Turn-buckle for Side Load Case 1

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View from TopView from Top

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Application of Force via Hydraulic Lift for Side Load Case 2Application of Force via Hydraulic Lift for Side Load Case 2

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Vertical Lift Load Test ResultsVertical Lift Load Test Results

• Actual added mass simulator load was 260 lbf (1157 N) versus required 256 lbf (1139 N).

• The test resulted in no anomalies. Test deemed successful.

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Proof Test for Vertical Lift Load Case 1Proof Test for Vertical Lift Load Case 1

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Proof Test for Vertical Lift Load Case 1Proof Test for Vertical Lift Load Case 1

LAT-TD-046181 GLAST LAT Project Tracker Inner Shipping Container Analysis and Test Results Tracker...

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