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Structural Analysis of Composite Lattice Core Sandwich Cylinders
The goal of this thesis is to investigate the structural behavior of sandwich cylindrical shells with composite lattice cores based on parametric finite element analysis and to assess their competitiveness with state-of-the-art technologies for buckling-prone cylindrical structures.
Background
Structural components in aerospace applications often comprise cylindrical shells such as fuselage sections, launch vehicle airframes, and satellite hubs. To increase the structural performance and buckling resistance, these structures are typically made of sandwich construction, consisting of high-strength composite facesheets separated by a low density core material, such as honeycomb or foam.
Motivation
Owing to their high specific strength and stiffness, composite lattice structures have recently gained increasing interest for use as core material in sandwich applications. Such structures can reach superior structural performance than state-of-the-art core materials and, due to the open cellular architecture, offer great potential for integrated functionality and load-tailored design. Sandwich structures with composite lattice cores hence provide new opportunities for lightweight design and are highly attractive for aerospace applications. The high specific performance of this novel technology emphasize the potential not only for planar sandwich applications, but also for buckling-prone cylindrical structures
Background Structural components in aerospace applications often comprise cylindrical shells such as fuselage sections, launch vehicle airframes, and satellite hubs. To increase the structural performance and buckling resistance, these structures are typically made of sandwich construction, consisting of high-strength composite facesheets separated by a low density core material, such as honeycomb or foam.
Motivation Owing to their high specific strength and stiffness, composite lattice structures have recently gained increasing interest for use as core material in sandwich applications. Such structures can reach superior structural performance than state-of-the-art core materials and, due to the open cellular architecture, offer great potential for integrated functionality and load-tailored design. Sandwich structures with composite lattice cores hence provide new opportunities for lightweight design and are highly attractive for aerospace applications. The high specific performance of this novel technology emphasize the potential not only for planar sandwich applications, but also for buckling-prone cylindrical structures
The goal of this thesis is to investigate the structural behavior of sandwich cylindrical shells with composite lattice cores based on parametric finite element analysis and to assess their competitiveness with state-of-the-art technologies for buckling-prone cylindrical structures. The major tasks are:
• Parametrization of cylindrical sandwich structures with lattice cores for different unit cell topologies
• Establishment of FE models for structural and buckling analysis of compression and bending loaded cylindrical
shells
• Numerical characterization of the structure based on parametric studies; Sensitivity of the structural performance to different design parameters; Identification of the governing failure modes
• Assessment of the structural performance compared to state-of-the-art honeycomb sandwich cylindrical shells
The goal of this thesis is to investigate the structural behavior of sandwich cylindrical shells with composite lattice cores based on parametric finite element analysis and to assess their competitiveness with state-of-the-art technologies for buckling-prone cylindrical structures. The major tasks are: • Parametrization of cylindrical sandwich structures with lattice cores for different unit cell topologies • Establishment of FE models for structural and buckling analysis of compression and bending loaded cylindrical shells • Numerical characterization of the structure based on parametric studies; Sensitivity of the structural performance to different design parameters; Identification of the governing failure modes • Assessment of the structural performance compared to state-of-the-art honeycomb sandwich cylindrical shells
Christoph Karl
ETH Zurich - CMASLab
Tannenstrasse 3
8092 Zurich
Tel: +41 44 632 0840
Email: karlc@ethz.ch
Christoph Karl ETH Zurich - CMASLab Tannenstrasse 3 8092 Zurich Tel: +41 44 632 0840 Email: karlc@ethz.ch