Report of the PRESIDENTIAL COMMISSION
on the Space Shuttle Challenger Accident
Volume 5 Index
Hearings of the Presidential
Commission on the Space Shuttle Challenger Accident: February 26,
1986 to May 2, 1986.
MARCH 21, 1986 SESSION. (part 2 of
2)
[1355] [Ref. 3/21-67] Max
"Q" Results.
H-204 MAX "Q"
RESULTS
|
STRUCTURAL ELEM.
|
LIMIT LOAD VALUE
|
51-L (ESTIMATED)
|
|
.
|
|
P3
|
AFT ET/ORB
|
484, -334
|
210
|
|
P4
|
481, -481
|
225
|
|
P5
|
168, -834
|
-415
|
|
P6
|
168, -834
|
-415
|
|
P7
|
177, -173
|
20, -20
|
|
.
|
|
P8
|
SRB/ET
|
393, -306
|
113
|
|
P9
|
190
|
|
P10
|
-160
|
|
P11
|
92
|
|
P12
|
95
|
|
P13
|
+/- 60
|
|
.
|
|
ET BARREL
|
|
3-40
|
10,000,000 LOAD IND.
|
6,000,000
|
|
.
|
|
SRB FIELD JOINT 1491
|
|
EQUIV. LOAD
|
-17,200,000 LBS
|
-10,800,000 LBS
|
[1356] [Ref. 3/21-68]
Findings.
FINDINGS
- STS 51-L LOADS WERE LOWER THAN DESIGN
LIMIT LOADS
- EFFECTS OF STS 51-L LOADS ON DEGRADED
RIGHT S0LID ROCKET BOOSTER AFT FIELD JOINT BEING ASSESSED
R-11
[1357] [Ref. 3/21-69 1 of
2] 51-L SRM Field Joint Analysis.
51-L SRM FIELD JOINT
ANALYSIS
MARCH 21, 1986
R. RYAN
R-12
[1358] [Ref. 3/21-69 2 of
2] Objective.
OBJECTIVE
RECONSTRUCT 51-L SRM FIELD JOINTS RESPONSE
(GAP OPENING) FOR ALL EVENTS USING RATING DATA, NATURAL ENVIRONMENTS,
INDUCED ENVIRONMENTS, AND RECONSTRUCTED 51-L LOADS.
R-13
[Ref. 3/21-70]
Scope.
SCOPE
- CONSIDER ALL 51-L ASSEMBLY/FLIGHT
EVENTS
- MATING (SRM SEGMENTS)
- STACKING
- TRANSPORTATION
- ON PAD
- LIFTOFF
- SSME THRUST BUILDUP (TWANG)
- SRM IGNITION TRANSIENT
- LIFTOFF TRANSIENT (AFTER
RELEASE)
- ROLL MANEUVER
- MAX "Q"
- 40 SECONDS
- PRE 58 SECONDS
- POST 58 SECONDS
R-14
[1359] [Ref. 3/21-71]
Approach.
APPROACH
- DEVELOP FINITE ELEMENT STATIC AND DYNAMIC
MODELS
- TUNE MODELS TO JOINT ROTATION TEST
- ADD SRM SEGMENTS, PROPELLANT, SRB
STRUCTURE TO MODEL
- CHARACTERIZE INITIAL JOINT
CONDITION
- CHARACTERIZE NATURAL AND INDUCED
ENVIRONMENTS (WINDS, TEMPERATURE, LOADS, ETC.)
- DETERMINE STATIC AND DYNAMIC RESPONSE OF
GAP AT PRIMARY AND SECONDARY SEALS.
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