Motivation

A true understanding of the structure-dependent functional properties of any I-FRC requires a sound knowledge of the correlations between the local strain distribution as well as the local and global deformation behavior of the overall system. A precise analysis of the deformation behavior will be realized by in-situ test strategies that are related to the functional and structural properties of the system. In order to guarantee long-term reliability of the functional I-FRC, fatigue behavior and damage tolerance have to be predicted. Microstructural changes as well as crack initiation can have a significant negative impact on the structural and functional integrity of the system.

State of the art and preliminary research

Predicting the fatigue behavior of elastomers has been a subject of research since the early 1940s. The cyclic strength of elastomers with functional fillers was, amongst others, analyzed by Zhou et al. By means of a silicon-based MSE it could be shown that with increasing particle volume the decrease in fatigue strength could be reduced. Microstructural analyses were carried out for torsionally loaded self-healing poly(dimethyl-siloxane) elastomers. The fatigue behavior of fiber-reinforced composites is often dominated by a change in damage mechanism. The leading investigator of this subproject is well known in the field of structure-property correlation and its experimental and simulation-based analysis.

Scientific questions and project objectives

On the basis of innovative test strategies, local and global structure-property correlations of I-FRC and their interactions are to be investigated. The results will form the foundation for a cross-scale, simulation-based design and assessment of the multi-matrix compounds. By carrying out mechanical tests on simple and clearly defined I-FRC samples while registering system-inherent sensor data, a calibration setup will be determined to evaluate the signals as future structural health monitoring devices. The correlation between finite deformation introduced during mechanical testing and likely changes in the microstructure and / or damage evolution are to be investigated for various test scenarios. Efficient test strategies have to be developed that represent the true load situations and the corresponding structural behavior of the I-FRC under operational conditions on a laboratory basis. The focus will be laid on both 3D motion as well as operation-determined boundary conditions, such as thermal and / or creep effects. In order to achieve a material-physics related understanding of the experimental results, the test strategy will start with fundamental experiments with basic elastomers aiming for increasing complexity to test the overall MMC system in a final stage. In this regard, a clear allocation of 3D motion and deformation to likely damage phenomena will be one of the major goals. In order to realize an in-situ monitoring of the damage evolution, the system-inherent individual metrics, such as changes in electric or magnetic properties, will be measured and classified on the basis of quasi defect-free and defect-afflicted test samples. The latter ones will be specifically introduced in the samples on purpose based on clearly defined defect types and sizes. The results will serve as evaluation basis for simulation results from TP6. Damage mechanisms and stages will be analyzed and interpreted by means of comprehensive metallographic and electron microscopy analyses.

Contact

Institute of Materials Science (IfWW), Chair of Materials Mechanics and Damage Analysis, Faculty of Mechanical Science and Engineering at TU Dresden

© IfWW/TUD

Name

Ms Prof. Dr.-Ing. Martina Zimmermann

Inhaberin der Professur Werkstoffmechanik u. Schadensfallanalyse

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