Quantcast Modifying a Cross-Section to Avoid Failure

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MIL-HDBK-1013/12
a) Dynamic load.  This information is created by Figure
C-7.
b) Worksheets (see Appendix B):
1)  Safevue Analysis
C.16.2
Modifying a Cross-Section to Avoid Failure.  While it
is not possible to provide a systematic approach to modifying a
cross-section when Safevue predicts failure, here are some
general guidelines to aid in producing a revised cross-section:
a) The relationship between load capacity and layer
thickness is nonlinear.  Doubling a cross-section
thickness will more than double the load capacity.
b) Larger thicknesses of glass have premium prices.
Avoid selecting glass layer thicknesses over 1/2
inch (12 mm), unless it is to avert additional
laminations.
c) Increasing the number of laminations can reduce the
velocity of glass fragments.  However, laminations
are expensive.  Carefully weigh the benefits of
reduced fragment velocity against the added cost.
d) When increasing the thickness of a layer, attempt to
maintain uniform thicknesses among the layers in a
plate while minimizing the overall thickness of the
plate.  For example, two 3/8-inch (9-mm) layers are
preferred to a plate with 1/2-inch (12-mm) and 1/4-
inch (6-mm) layers, and a plate consisting of 5/8-
inch (16-mm), 1/2-inch (12-mm), and 1/2-inch (12-mm)
layers is preferred to one with 3/4-inch (19-mm),
1/2-inch (12-mm), and 1/4-inch (6-mm) layers.
However, a plate consisting of 5/8-inch (16-mm) and
1/4-inch (6-mm) layers is preferred to one with two
1/2-inch (12-mm) layers because of the smaller
overall thickness.
e) Larger thicknesses of materials are not generally
available.  Avoid selecting glass layer thicknesses
over 3/4 inch (19 mm).
C.16.3
Modifying a Cross-Section to Avoid Overdesign.  While
it is not possible to provide a systematic approach to modifying
a cross-section when Safevue predicts overdesign, there are some
general guidelines to aid an analyst in producing a revised
cross-section:
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