SAMPE Journal - September/October 2016 - 10

Feature
rticle
EATUREAA
RTICLE

Figure 10. Consolidation in R&D autoclave, a tight fit.
Figure 9. Ultrasonic AFP of the skin.

Drain Hole Drilling
The grid panel has no natural drain paths since there
is no mouse hole at the stringer. To prevent entrapped
(condensation) water in the fuselage, 8mm holes are
drilled in the circumferential stringer web, as shown in
Figure 13. FE studies showed that the hole has an effect
on the stress distribution in the grid corner, but can be
accepted.
Frame Welding
To complete the shell, frames are welded to the
circumferential stringers. First, the circumferential cap
is removed by machining. Note that it is also possible
to consolidate a blade stringer, but this was not chosen
here for cost reasons, since a tool modification is then
required. Next the frame is welded to the circumferential
stringer. The weld head is moved by a robot and closes
automatically.
Panel BVID Impact Behavior
Impact of fuselage panels can happen during
assembly and maintenance of the aircraft and can cause
delamination in laminates and joints, especially when
no bolts are used for out of plane strength. So, the first
evaluation of the orthogrid panel concept was on impact
behavior of the butt joint. The panel was impacted from
both the outside and the inside and was suspended
on the frames as shown in Figure 18. Impacts were
inflicted until a 1mm dent depth was obtained, which is
defined as BVID (barely visible impact damage). BVID is
assumed to be present in the structure during its entire
life and no growth and ultimate load capability should be
demonstrated including BVID.
What Kind of Butt Joint Damage will be Present
because of BVID?
The impacts on the outside of the panel (OML) resulted
in 30 to 40 mm butt joint damage (Figure 18), but only
due to impacts directly on the stringer center lines. All
other OML impacts caused dents in the skin without butt
joint damage. Also an OML impact on the grid corner did
not result in a clear dent or butt joint damage at the cut
off energy (50J).
10

Figure 11. Test on automatic tool block removal with a
pneumatic gripper.

Figure 12. Concept for Full scale tool block removal from
panel.

The impacts on the inside of the panel were expected
to be more severe for the butt joint, since then high peel
loads are generated. Impact in the corner of the grid
SAMPE Journal, Volume 52, No. 5, September/October 2016



Table of Contents for the Digital Edition of SAMPE Journal - September/October 2016

Contents
SAMPE Journal - September/October 2016 - Cover1
SAMPE Journal - September/October 2016 - Cover2
SAMPE Journal - September/October 2016 - Contents
SAMPE Journal - September/October 2016 - 2
SAMPE Journal - September/October 2016 - 3
SAMPE Journal - September/October 2016 - 4
SAMPE Journal - September/October 2016 - 5
SAMPE Journal - September/October 2016 - 6
SAMPE Journal - September/October 2016 - 7
SAMPE Journal - September/October 2016 - 8
SAMPE Journal - September/October 2016 - 9
SAMPE Journal - September/October 2016 - 10
SAMPE Journal - September/October 2016 - 11
SAMPE Journal - September/October 2016 - 12
SAMPE Journal - September/October 2016 - 13
SAMPE Journal - September/October 2016 - 14
SAMPE Journal - September/October 2016 - 15
SAMPE Journal - September/October 2016 - 16
SAMPE Journal - September/October 2016 - 17
SAMPE Journal - September/October 2016 - 18
SAMPE Journal - September/October 2016 - 19
SAMPE Journal - September/October 2016 - 20
SAMPE Journal - September/October 2016 - 21
SAMPE Journal - September/October 2016 - 22
SAMPE Journal - September/October 2016 - 23
SAMPE Journal - September/October 2016 - 24
SAMPE Journal - September/October 2016 - 25
SAMPE Journal - September/October 2016 - 26
SAMPE Journal - September/October 2016 - 27
SAMPE Journal - September/October 2016 - 28
SAMPE Journal - September/October 2016 - 29
SAMPE Journal - September/October 2016 - 30
SAMPE Journal - September/October 2016 - 31
SAMPE Journal - September/October 2016 - 32
SAMPE Journal - September/October 2016 - 33
SAMPE Journal - September/October 2016 - 34
SAMPE Journal - September/October 2016 - 35
SAMPE Journal - September/October 2016 - 36
SAMPE Journal - September/October 2016 - 37
SAMPE Journal - September/October 2016 - 38
SAMPE Journal - September/October 2016 - 39
SAMPE Journal - September/October 2016 - 40
SAMPE Journal - September/October 2016 - 41
SAMPE Journal - September/October 2016 - 42
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SAMPE Journal - September/October 2016 - 44
SAMPE Journal - September/October 2016 - 45
SAMPE Journal - September/October 2016 - 46
SAMPE Journal - September/October 2016 - 47
SAMPE Journal - September/October 2016 - 48
SAMPE Journal - September/October 2016 - 49
SAMPE Journal - September/October 2016 - 50
SAMPE Journal - September/October 2016 - 51
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SAMPE Journal - September/October 2016 - 53
SAMPE Journal - September/October 2016 - 54
SAMPE Journal - September/October 2016 - 55
SAMPE Journal - September/October 2016 - 56
SAMPE Journal - September/October 2016 - 57
SAMPE Journal - September/October 2016 - 58
SAMPE Journal - September/October 2016 - 59
SAMPE Journal - September/October 2016 - 60
SAMPE Journal - September/October 2016 - 61
SAMPE Journal - September/October 2016 - 62
SAMPE Journal - September/October 2016 - 63
SAMPE Journal - September/October 2016 - 64
SAMPE Journal - September/October 2016 - 65
SAMPE Journal - September/October 2016 - 66
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SAMPE Journal - September/October 2016 - 69
SAMPE Journal - September/October 2016 - 70
SAMPE Journal - September/October 2016 - 71
SAMPE Journal - September/October 2016 - 72
SAMPE Journal - September/October 2016 - 73
SAMPE Journal - September/October 2016 - 74
SAMPE Journal - September/October 2016 - 75
SAMPE Journal - September/October 2016 - 76
SAMPE Journal - September/October 2016 - 77
SAMPE Journal - September/October 2016 - 78
SAMPE Journal - September/October 2016 - 79
SAMPE Journal - September/October 2016 - 80
SAMPE Journal - September/October 2016 - 81
SAMPE Journal - September/October 2016 - 82
SAMPE Journal - September/October 2016 - 83
SAMPE Journal - September/October 2016 - 84
SAMPE Journal - September/October 2016 - 85
SAMPE Journal - September/October 2016 - 86
SAMPE Journal - September/October 2016 - 87
SAMPE Journal - September/October 2016 - 88
SAMPE Journal - September/October 2016 - 89
SAMPE Journal - September/October 2016 - 90
SAMPE Journal - September/October 2016 - 91
SAMPE Journal - September/October 2016 - 92
SAMPE Journal - September/October 2016 - 93
SAMPE Journal - September/October 2016 - 94
SAMPE Journal - September/October 2016 - 95
SAMPE Journal - September/October 2016 - 96
SAMPE Journal - September/October 2016 - 97
SAMPE Journal - September/October 2016 - 98
SAMPE Journal - September/October 2016 - 99
SAMPE Journal - September/October 2016 - 100
SAMPE Journal - September/October 2016 - 101
SAMPE Journal - September/October 2016 - 102
SAMPE Journal - September/October 2016 - 103
SAMPE Journal - September/October 2016 - 104
SAMPE Journal - September/October 2016 - 105
SAMPE Journal - September/October 2016 - 106
SAMPE Journal - September/October 2016 - 107
SAMPE Journal - September/October 2016 - 108
SAMPE Journal - September/October 2016 - 109
SAMPE Journal - September/October 2016 - 110
SAMPE Journal - September/October 2016 - 111
SAMPE Journal - September/October 2016 - 112
SAMPE Journal - September/October 2016 - 113
SAMPE Journal - September/October 2016 - 114
SAMPE Journal - September/October 2016 - 115
SAMPE Journal - September/October 2016 - 116
SAMPE Journal - September/October 2016 - 117
SAMPE Journal - September/October 2016 - 118
SAMPE Journal - September/October 2016 - 119
SAMPE Journal - September/October 2016 - 120
SAMPE Journal - September/October 2016 - Cover3
SAMPE Journal - September/October 2016 - Cover4
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