Mechanical Property Allowables Generated for the Solid Rocket Booster Composite Nose Cap

102 Pages·2015·2.97 MB·English

https://ntrs.nasa.gov/search.jsp?R=20000060843 2018-01-21T22:04:17+00:00Z
NASA/TM--2000-210252
Mechanical Property Allowables
Generated for the Solid Rocket Booster
Composite Nose Cap
A.J. Hodge
Marshall Space Flight Center, Marshall Space Flight Center, Alabama
May 2000
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NASA/TM--2000-210252
Mechanical Property Allowables
Generated for the Solid Rocket Booster
Composite Nose Cap
A.J. Hodge
Marshall Space Flight Center, Marshall Space Flight Center, Alabama
National Aeronautics and
Space Administration
Marshall Space Flight Center • MSFC, Alabama 35812
May 2000
Acknowledgements
Doug Wingard performed dynamic mechanical analyzer (DMA) and dynamic scanning calorimeter (DSC) testing toobtain
valuable glass transition temperatures. Dawn Cross performed FTIR analysis on the epoxy resin. Nonmetallic Materials and
Processes Group personnel performed all mechanical property testing.
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TABLE OF CONTENTS
1. INTRODUCTION ...........................................................................................................................
2. SPECIMEN PREPARATION ......................................................................................................... 2
2
2.1 Materials and Processing .........................................................................................................
2
2.2 Test Specimen Geometry .........................................................................................................
3
2.3 Moisture Conditioning .............................................................................................................
3. TEST METHODOLOGY ............................................................................................................... 7
3.1 Thermal Profile ........................................................................................................................ 7
3.2 Lot-to-Lot and Panel-to-Panel Variability ................................................................................ 8
8
3.3 Tensile Testing ..........................................................................................................................
9
3.4 In-Plane Shear Testing .............................................................................................................
10
3.5 Compression Testing ................................................................................................................
11
3.6 Interlaminar Shear Testing .......................................................................................................
11
3.7 Core Testing .............................................................................................................................
11
3.8 Sandwich Tensile Testing .........................................................................................................
4. SOUTHERN RESEARCH INSTITUTE CORRELATION STUDY ............................................. 13
17
5. TEST RESULTS .............................................................................................................................
6. CONCLUSIONS ............................................................................................................................. 19
APPENDIX A--A COMPARISON OF LOTS 1-3 CHARTING THE PROPERTIES
21
VERSUS TEMPERATURE ................................................................................................................
APPENDIX B--A DETAILED SUMMARY OF THE DATA ........................................................... 33
91
BIBLIOGRAPHY ...............................................................................................................................
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LIST OF FIGURES
Test specimen geometry ....................................................................................................... 3
I.
2. Weight gain of coated versus uncoated AS4/3501-6 composite coupons at 120 °F,
93-percent RH ....................................................................................................................... 4
Weight gain of uncoated and Hypalon coated AS4/3501-6 at 160 °F,
.
93-percent RH neglecting the weight gain of the Hypalon .................................................. 4
. Drop in Tg associated with exposure time at 180 °F 93-percent RH ................................... 5
5. Drop in Tg associated with moisture gain ............................................................................ 5
6. Comparison of moisture conditioning treatments on AS4/3501-6 ...................................... 6
7. Thermal history of SRB CNC at the saturation point ........................................................... 7
. Two-stage nested factorial .................................................................................................... 8
9. Tensile test with quartz lamp heaters .................................................................................... 9
0. Compression test fixture with resistance heat strips ............................................................. 10
1. Tensile stress (warp) ............................................................................................................. 25
2. Tensile modulus (warp) ........................................................................................................ 25
3. Tensile stress (fill) ................................................................................................................. 26
4. Tensile modulus (fill) ............................................................................................................ 26
5. Compressive stress (warp) .................................................................................................... 27
16. Compressive modulus (warp) ............................................................................................... 27
17. Compressive stress (fill) ....................................................................................................... 28
18. Compressive modulus (fill) .................................................................................................. 28
19. In-plane shear stress (t12) ...................................................................................................... 29
20. Shear modulus ...................................................................................................................... 29
LIST OF FIGURES (Continued)
21. Double-notch shear (t13) ....................................................................................................... 30
22. Foam shear ............................................................................................................................ 30
23. Foam edgewise tensile stress ................................................................................................ 31
24. Foam compression ................................................................................................................ 31
25. Boeing compression after impact strength at 75 and 350 °F ................................................ 32
LIST OF TABLES
° Overview of the tests made on the samples .......................................................................... 2
2. AS4/3501-6 8H lot 1 tensile ................................................................................................ 14
3. AS4/3501-6 8H lot 1 compression ....................................................................................... 15
4. AS4/3501-6 8H lot 1 shear .................................................................................................. 16
5. AS4/3501-6 8H lot 1 DNS ................................................................................................... 16
6. Lamina level tests (AS/3501-6), core tests SC350G, and sandwich tests ............................ 18
7. Various test results for lots 1-3 ............................................................................................. 21
8. Test result data in detail ........................................................................................................ 33
vi
LIST OF ACRONYMS AND SYMBOLS
ASTM American Society for Testing Materials
CAI compression after impact
CNC composite nose cap
DMA dynamic mechanical analyzer
DNS double-notch shear
DSC dynamic scanning calorimeter
E epoxy
ED20 Structures, Mechanics, and Thermal Department
ED30 Materials, Processes, and Manufacturing Department
FTIR Fourier transform infrared spectroscopy
G graphite
IHGF Improved Hot Gas Facility
MCC Marshall convergent coating
MSFC Marshall Space Flight Center
MTS Materials Test System
P1 prototype
RH relative humidity
SRB solid rocket booster
SRI Southern Research Institute
Tg glass transition temperature
TPS thermal protection system
USBI United Space Boosters, Inc.
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