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Impact simulation of elastic fuel tanks reinforced with exoskeleton for aerospace applications
KTH, School of Engineering Sciences (SCI), Mechanics.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The main subject of the thesis is impact simulation of an elastic fuel tank

reinforced with a polymer exoskeleton. Thanks to its light weight and failure

resistance, this type of design shows potential to be used in aerospace

applications. The simulation imitates a drop test from the height of 20 m

on a rigid surface, in accordance with Military Handbook testing guidelines

for fuel tanks. The focus is on establishing the best practices for modelling

and solving this type of problems. The computational methods are tested

on a generic model of a rectangular prismatic tank with rounded edges. The

walls of the tank are made of a combination hyperelastic rubber material orthotropic

fabrics. The simulation is performed for the 70% and 100% water

lled tank. All calculations are performed using the Altair HyperWorks 13.0

software suite, in particular the RADIOSS solver and OptiStruct Solver and

Optimiser. The criteria for evaluation of model and simulation quality are

suggested. Comparison is made between various uid (ALE and SPH) and

solid (composite and hyperelastic) modelling approaches. Material parameters

are found using the least-squares t to the experimental measurements.

The nal, most robust and accurate model serves as a basis for establishing

a design optimisation procedure, aiming at reduction of mass of tank

components while ensuring the structural integrity. Furthermore, the advantages

and drawbacks of di erent modelling approaches are discussed. The

main conclusions from the study are summarised and suggested directions

for future work are given.

Place, publisher, year, edition, pages
2015. , 85 p.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-170775OAI: diva2:839830
Educational program
Master of Science - Aerospace Engineering
Available from: 2015-07-06 Created: 2015-07-06 Last updated: 2015-07-06Bibliographically approved

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