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Loads and Requirements for Military Aircraft

Probabilistic composite design is simply the process
required to evaluate the reliability of a specific
design. The reliability of any specific design is
determined by evaluating the probability that all
structural design criteria are satisfied at pre speci-
fied levels of probability. Evaluation of the proba-
bilities for the various structural responses to satis-
fy the pre specified design criteria requires quantif-
ication of uncertainty ranges for each response. To
quantify those uncertainty ranges in composite
structural design we need to have formal methods
which trace the uncertainty ranges of all participat-
ing variables in the structural design. We, there-
fore, must start with the constituent materials and
continue introducing uncertainties expected to be
present as we progress through the higher scales
(micro, macro, laminate and structure). Another
important aspect in probabilistic composite struc-
tural design is verification. Substantial work has
been reported for the predictive part of probabi-
listic composite structural design [1,2]. The objec-
tive of the present article is to describe a multisc-
ale probabilistic composite design method and
comparison with measured data.
A multiscale probabilistic composite design to be
practical must be in the form of computational
simulation. In order to be credible it must have
appropriate verification at all scale levels. The
procedure must be suitably illustrated to be in-str-
uctive. The design must be representative of typi-
ml designs to add confidence in the method and
simulation scheme used. In this article we intro-
duce probabilistic structural analysis/design with a
simple component in order to identify the essential
elements. We continue with the description of the
formal methods and their respective computer
codes. We follow these up with applications for
setting and or deciding strength allowables for ply,
laminate, and laminate with holes. We describe
select extensions for fabrication implimtions, test-
ing guidelines and laminate fatigue. We conclude
with a sample probabilistic composite design.
Select references are cited for complimentary infor-
mation.