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15. Remaining Dielectric and Mechanical Properties of Composite Materials

PRASUN MAJUMDAR, JALLISA CLIFFORD and HUNTER GOMAN

Abstract


Composite materials go through a complex process of damage evolution which affect global property (strength and stiffness) degradation and eventual failure. The objective of this study is to enhance understanding of local damage mechanisms and property evolution utilizing frequency depedent dielectric response of carbon fiber reinforced composite materials. Specifically, material state change has been discussed in two example cases: (1) Damage distribution and remaining property after low velocity impact until barely visible impact damage (BVID) limit, and (2) Evolution of damage mechanisms in different laminates during tension loading. A 3D X-ray microscope has been used to visualize and hence validate evolution of damage. Validated results from these test cases show that degradation process, and evolution of properties can be represented by material state variables with a high sensitivity. This provides an opportunity for the development of predictive modeling. Details of experimental methods and results will be presented.

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