module penetration. ... tip-to-tip distance with respect to the inner wall grain direction, and the ... Figure 1 shows the normal impact (i.e. 0=0) of a dual-wall.
N95- 19OO3 S 0 ;:J,,< .Q_ 1994 NASA/ASEE
SUMMER
FACULTY
MARSHALL SPACE THE UNIVERSITY
FELLOWSHIP
PROGRAM
FLIGHT CENTER OF ALABAMA
CRACKING CHARACTERISTICS OF A HABITABLE MODULE PRESSURE WALL FOLLOWING ORBITAL DEBRIS PENETRATION
Prepared
By:
William
P. Schonberg,
Academic
Rank:
Associate
Institution
and Department:
The University Department
Professor of Alabama
Laboratory: Division:
Structures Structural
Design
Branch:
Structural
Development
Colleague:
Dr. Joel Williamsen
XXXVI
in Huntsville
of Civil & Environmental
NASA/MSFC:
MSFC
Ph.D.
and Dynamics
Engineering
INTRODUCTION All long-duration meteoroids design
and pieces
consideration
presents
the results
magnitudes habitable predictions
cracking
penetration.
unzipping
unzipping
addition,
whose
occur
under lifetime
hole size predictions
creation analysis
for module
evacuation
of the phenomena
considered
include
prior to the onset
maximum
EXPERIMENTAL
Debris
spacecratt
Simulation
wall,
Facility
a blanket
[3].
of multi-layer
to determine
conditions.
in such an analysis. analysis
due to air loss.
maximum
tip-to-tip
AND
(MLI)
was
O
$2/S
crack
distance,
of thermal inserted
impacted by a at the NASA/MSFC insulation
between
in the
the bumper the lethality
and of the
Dp
BUMPER
v
AL 6061-T6 (_
ts
MLI BLANKET
T S
= 0.23,0.50,0.94
0.81 < ts < 2.03
Some
Lvo
11.12 mm
2.9 < Vp < 7.4 km/sec 0 < 0 < 75 deg 4.32 < S < 15.24 cm
to determine
DATA
the presence
mm
PRESSURE
WALL
AL 2219-T87_
_
tw
2.03 < t w < 4.83 mm twp=0.51
, 1.02 mm WITNESS
6061-T6
PLATES
_:::::_twp
AL Figure
1. Hypervelocity
Impact
EMPIRICAL
data;
Equations (1-19) Tables 1-3 provide
regression
equation
are the result corresponding
predictions,
of a Generic
PREDICTOR
Dual-Wall
standard
deviations
XxxvI-1
Structure
EQUATIONS
of a multiple linear regression average errors (in percent) of the errors
analysis between
performed on the actual data and
(also in percent),
of
In
of a survivability
inner wall. The witness plates behind the inner wall are used to characterize debris exiting the inner wall in the event of inner wall perforation.
