The bi-directionally corrugated core structure

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Table of contents

INTRODUCTION
Existing core structures
Forming of sandwich panels
Modeling the behavior of cellular solids
Overview of the thesis
CHAPTER I : DESCRIPTION AND MODEL OF THE BI-DIRECTIONALLY CORRUGATED SANDWICH STRUCTURE
1.1. The bi-directionally corrugated core structure
1.1.1 Core architecture and stamping tool
1.1.2 Basis material
1.2. Stamping experiments
1.2.1 Experimental set-up
1.2.2 Experimental results
1.3. Computational models for “virtual experiments”
1.3.1 Important modeling assumptions
1.3.2 Manufacturing simulations
1.1.1.1. Stamping
1.1.1.2. Forming of the bonding land, springback and joining of the core layers and face sheets
CHAPTER II : OPTIMIZATION OF THE EFFECTIVE SHEAR PROPERTIES OF THE BIDIRECTIONALLY CORRUGATED SANDWICH CORE STRUCTURE
2.1. Estimation of the effective shear stiffness
2.2. Parametric study of the effective shear stiffness
2.2.1 Input parameters
2.2.2 Results
2.2.2 Comment on the optimal design of formable sandwich sheets
2.3. Experimental validation
2.3.1 Four-point bending experiment
2.3.2 Model for the bending of the sandwich structure
2.4. Conclusions
CHAPTER III : PLASTICITY OF FORMABLE ALL-METAL SANDWICH SHEETS: VIRTUAL EXPERIMENTS AND CONSTITUTIVE MODELING
3.1. Models for virtual experiments
3.1.1 Out-of-plane compression
3.1.2 Out-of-plane shear
3.1.3 Uniaxial in-plane loading
3.1.4 Combined in-plane loading
3.2. Results from virtual experiments
3.2.1 Uniaxial out-of plane compression
3.2.2 Out-of-plane shear
3.2.3 Uniaxial in-plane tension
3.2.4 Uniaxial in-plane compression
3.2.5 Biaxial in-plane behavior
3.2.6 Volume change of core structure
3.3. Phenomenological macroscopic constitutive model
3.3.1 Modeling approach
3.3.2 Notation and kinematics
3.3.3 Elastic constitutive equation
3.3.4 Macroscopic yield surface
3.3.5 Distortional-isotropic hardening
3.3.6 Flow rule and volume change
3.3.7 Summary of material model parameters
3.4. Validation and discussion
3.4.1 Comparison: macroscopic model versus virtual experiments
3.4.2 Discussion
3.5. Conclusions
CHAPTER IV : MODEL PARAMETER IDENTIFICATION AND APPLICATION TO DRAW BENDING
4.1. Calibration experiments
4.1.1 Calibration experiment #1: Uniaxial tension
4.1.2 Calibration experiment #2: Four-point bending
4.2. . Material model parameter identification
4.2.1 Summary of material model parameters
4.2.2 Elastic constants and thickness change parameter
4.2.3 Isotropic-distortional hardening functions
4.2.4 Composite shell element models
4.2.4.1. Shell model for uniaxial tension
4.2.4.2. Shell element model for four-point bending
4.2.5 Inverse model parameter identification
4.3. Structural validation: draw bending
4.3.1 Virtual experiment
4.3.2 Composite shell model predictions and discussion
4.4. Conclusions
CONCLUSION
FUTURE WORK
JOURNAL PUBLICATIONS RELATED TO THIS WORK
REFERENCES