Publication: Analysis of composite laminate plates subjected to ballistic impact
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Publication date
2019-06
Defense date
2019-07-01
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Impact
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Abstract
During many years and still nowadays, ballistic impacts are an important field of
study. In a world in which every year the air transport demand increases linearly,
major aerospace companies focus their efforts in developing the next generation of
aircrafts with materials harder and resistant to almost any type of impact, making
them also aerodynamically more efficient and the most lightweight as possible. And
those materials that are fulfilling those requirements and still have enough potential
to success are composite materials.
The main objective of this paper is to describe in detail the analysis performed to a
composite laminate plate which is subjected to different ballistic impacts.
By doing this and for the ease of comprehension, the project will be divided into several parts. Firstly it will be described what is and how behaves a composite material
and speciffically the type used for this analysis which is a laminate composite.
To perform the ballistic process, the computational finite element program LS-
Dyna® will be utilized to model all the scenarios subjected to analyze. However,
before doing the expected cases, it will be described a sensitivity analysis in which
all the features and tools used to generate an e cient and realistic ballistic impact
will be introduced. Several trials will be evaluated and compared with experimental
data to select the best case which will be used onwards on the project.
After that, the cases to be analyzed will be described. The selected laminate composite plate will be subjected to a variation in geometry, thickness, boundary conditions
and mechanical properties under the same type of ballistic impacts. The analysis
of the results will be based on one important failure mode which is crucial in the
analysis of composite materials, the delamination produced. Moreover, it will be
studied also the residual velocity displayed after the impact.
Finally, last chapters of the project will be devoted to the regulatory framework
involved throughout this analysis, the socio-economic impact that this type of study
and analysis of composite materials provokes in the real life and the estimation of
the budget that this project would generate.
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Keywords
Composite materials, Laminate plates, Impact, Delamination, Residual velocity, Delaminated area