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Numerical Investigation of the Post-failure Behavior of Ultra-lightweight Composite Lattice Core Sandwich Structures
Composite lattice core sandwich structures are characterized by a gradual failure behavior, providing them with good energy absorption characteristics. The goal of this work is to numerically investigate the post-failure response of composite lattice cores based on finite element anaysis.
Background: Owing to their outstanding stiffness and strength, composite lattice structures have recently gained increasing interest for use as sandwich core materials in ultra-lightweight aerospace applications. By virtue of their stretch-dominated architecture, these structures can reach superior mechanical performance than state of the art core materials such as honeycombs and foams, while providing great potential for multifunctionality.
Motivation: At CMASLab, a novel type of ultra-lightweight composite lattice core sandwich structures is being developed. As opposed to conventional sandwich core materials, which fail catastrophically after reaching a peak stress, the failure of composite lattice cores is characterized by a progressive failure of individual core members (buckling/crushing), leading to a gradual reduction of the core strength. As a results, these structures possess excellent energy absorption capabilities. To increase the technology readiness sandwich lattice cores, it is of great importance to develop numerical models capable of predicting the post failure response of composite lattice cores.
Background: Owing to their outstanding stiffness and strength, composite lattice structures have recently gained increasing interest for use as sandwich core materials in ultra-lightweight aerospace applications. By virtue of their stretch-dominated architecture, these structures can reach superior mechanical performance than state of the art core materials such as honeycombs and foams, while providing great potential for multifunctionality.
Motivation: At CMASLab, a novel type of ultra-lightweight composite lattice core sandwich structures is being developed. As opposed to conventional sandwich core materials, which fail catastrophically after reaching a peak stress, the failure of composite lattice cores is characterized by a progressive failure of individual core members (buckling/crushing), leading to a gradual reduction of the core strength. As a results, these structures possess excellent energy absorption capabilities. To increase the technology readiness sandwich lattice cores, it is of great importance to develop numerical models capable of predicting the post failure response of composite lattice cores.
The goal of this thesis is to numerically investigate the progressive post-failure response of composite lattice core sandwich structures, based on nonlinear finite element analyses. The major tasks are: • Literature research on progressive failure analysis of composite materials and lattice structures • Establishment of a finite element model capable of capturing the different failure modes (member buckling,member crushing, interface failure) and the failure progression in composite lattice core sandwich structures • Model validation and improvement based on existing data on the compression and shear response of composite lattice core sandwich structures
The goal of this thesis is to numerically investigate the progressive post-failure response of composite lattice core sandwich structures, based on nonlinear finite element analyses. The major tasks are: • Literature research on progressive failure analysis of composite materials and lattice structures • Establishment of a finite element model capable of capturing the different failure modes (member buckling,member crushing, interface failure) and the failure progression in composite lattice core sandwich structures • Model validation and improvement based on existing data on the compression and shear response of composite lattice core sandwich structures
Christoph Karl
PhD Candidate
ETH Zurich - CMASLab
Leonhardstr. 21, LEE O225
8092 Zurich, Switzerland
Tel: +41 44 632 0840
Email: karlc@ethz.ch
Christoph Karl PhD Candidate ETH Zurich - CMASLab Leonhardstr. 21, LEE O225 8092 Zurich, Switzerland