Register now After registration you will be able to apply for this opportunity online.
This opportunity is not published. No applications will be accepted.
Load-tailored Placement of Additively Manufactured Facesheet Stringers for Enhanced Performance of Composite Lattice Core Sandwich Structures
The objective of this thesis is to investigated the attainable performance increase of composite lattice core sandwich structures under multi-axial load cases through the load-tailored placement
of additively manufactured facesheet reinforcements.
Background: At CMASLab, composite lattice core (CLC) sandwich structures are currently investigated as a novel, highly efficient structural concept for ultra-lightweight aerospace applications. Owing to their stretch-dominated behavior combined with the potential for load-tailored design and integrated functionality, these structures can reach outstanding structural efficiency.
Motivation: Fabrication of the CLC sandwich structures is realized by the CLF process, which enables joining of the lattice core and facesheets based on thermoplastic welding. The patented CLF process furthermore allows the additive manufacture (AM) of local CFRP stringer reinforcements on the facesheets. Previous investigations have demonstrated the substantial performance enhancement of CLC sandwich structures under multi-axial load cases through the use of optimized, load-tailored lattice core topologies. Given the possibilities of the CLF process for locally realizing stringer reinforcements, it is envisaged that the performance of CLC sandwich structures under such combined load cases can be further increased through the load-tailored placement of additively manufactured facesheet reinforcements.
Background: At CMASLab, composite lattice core (CLC) sandwich structures are currently investigated as a novel, highly efficient structural concept for ultra-lightweight aerospace applications. Owing to their stretch-dominated behavior combined with the potential for load-tailored design and integrated functionality, these structures can reach outstanding structural efficiency.
Motivation: Fabrication of the CLC sandwich structures is realized by the CLF process, which enables joining of the lattice core and facesheets based on thermoplastic welding. The patented CLF process furthermore allows the additive manufacture (AM) of local CFRP stringer reinforcements on the facesheets. Previous investigations have demonstrated the substantial performance enhancement of CLC sandwich structures under multi-axial load cases through the use of optimized, load-tailored lattice core topologies. Given the possibilities of the CLF process for locally realizing stringer reinforcements, it is envisaged that the performance of CLC sandwich structures under such combined load cases can be further increased through the load-tailored placement of additively manufactured facesheet reinforcements.
The objective of this thesis is to investigated the attainable performance increase of CLC sandwich structures under multi-axial load cases through the load-tailored placement of additively manufactured facesheet reinforcements made by CLF. The major tasks are • Geometric parametrization of local facesheet reinforcements in CLC sandwich structures • Adaptation of an existing topology optimization framework for sandwich lattice cores with respect to local facesheet reinforcements • Identification of optimum facesheet reinforcement
patterns for multi-axial load cases (e.g. 3-point-bending) based on numerical optimizations • Assessment of the attained performance increase compared to non-reinforced CLC sandwich structures • For MT level: Fabrication and experimental testing of the optimized structures
The objective of this thesis is to investigated the attainable performance increase of CLC sandwich structures under multi-axial load cases through the load-tailored placement of additively manufactured facesheet reinforcements made by CLF. The major tasks are • Geometric parametrization of local facesheet reinforcements in CLC sandwich structures • Adaptation of an existing topology optimization framework for sandwich lattice cores with respect to local facesheet reinforcements • Identification of optimum facesheet reinforcement patterns for multi-axial load cases (e.g. 3-point-bending) based on numerical optimizations • Assessment of the attained performance increase compared to non-reinforced CLC sandwich structures • For MT level: Fabrication and experimental testing of the optimized structures
Christoph Karl
PhD Candidate
CMASLab - ETH Zurich
Leonhardstr. 21, LEE O225
8092 Zurich, Switzerland
Tel: +41 44 632 0840
Email: karlc@ethz.ch
Christoph Karl
PhD Candidate CMASLab - ETH Zurich Leonhardstr. 21, LEE O225 8092 Zurich, Switzerland