Experiments to Detect Damage Progression in Axially Compressed CFRP Panels under Cyclic Loading

Richard Degenhardt; Dirk Wilckens; Hermann Klein; Alexander Kling; Klaus Rohwer; Wolfgang Hillger; Hans Christian Goetting; Andreas Gleiter

doi:10.4028/www.scientific.net/KEM.383.1

Paper Titles

Preface

Experiments to Detect Damage Progression in Axially Compressed CFRP Panels under Cyclic Loading
p.1

An Experimental and Numerical Study of the Static and Fatigue Performance of a Composite Adhesive Repair
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Influence of Porosity on the Interlaminar Shear Strength of Fibre-Metal Laminates
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Automatic Insertion of Cohesive Elements for Delamination Modelling
p.53

BEM Analysis of Semipermeable Piezoelectric Cracks
p.67

A Boundary Element Free Implementation Using NGF to Solve Fracture Mechanics Applications
p.85

Boundary Element Analysis of Cracked Sheets Repaired with Bonded Anisotropic Patches
p.97

Dual Boundary Element Analysis for Time-Dependent Fracture Problems in Creeping Materials
p.109

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Experiments to Detect Damage Progression in Axially Compressed CFRP Panels under Cyclic Loading

Abstract:

The aircraft industry strives for significantly reduced development and operating costs. Reduction of structural weight at safe design is one possibility to reach this objective which is aimed by the running EU project COCOMAT. The main objective of COCOMAT is a future design scenario for composite curved stiffened panels which are understood as parts of real aircraft structures. This design scenario exploits considerable reserve carrying capacities in fibre composite fuselage structures by accurate simulation of collapse. The project results will comprise an experimental data base, improved slow and fast computational tools as well as design guidelines. A reliable simulation of the collapse load requires also taking degradation into account. For the validation of the tools a sound database of experiments are needed which give information about the progress of damage during the loading process. This paper focuses on experimental results of four nominally identical CFRP panels tested within the COCOMAT project at the buckling test facility of the Institute of Composite Structures and Adaptive Systems (DLR). In a first step, three of the four panels were loaded several thousand times. Each time the panel was loaded beyond global buckling and was unloaded to zero. Finally, all panels were tested until collapse. During the tests, advanced measurement systems such as High-Speed-ARAMIS, thermography and Lamb-waves were applied. The test results given in this paper may be used as benchmarks.

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Periodical:

Key Engineering Materials (Volume 383)

Pages:

1-24

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.383.1

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Online since:

June 2008

Authors:

Richard Degenhardt, Dirk Wilckens, Hermann Klein, Alexander Kling, Klaus Rohwer, Wolfgang Hillger, Hans Christian Goetting, Andreas Gleiter

Keywords:

Buckling, Collapse, Composite Structure, Cyclic Loading, Degradation, Post-Buckling, Skin-Stringer Separation, Stability, Test

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