Optimization-Based Monitoring of Laminated CFRP Composites using Electrical Resistance Changes
TOKYO INST OF TECH (JAPAN) DEPT OF MECHANICAL ENGINEERING
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Impact load like a tool drop easily causes a delamination crack in a laminated Carbon Fiber Reinforced Polymer CFRP. The delamination crack causes deterioration of structural reliability of a laminated CFRP. Monitoring of delamination is, therefore, indispensable to maintain the high reliability of a CFRP structure. An Electrical resistance change method ERCM is one of the candidates for the monitoring of the delamination crack. Although the ERCM is the convenient method without installing additional sensors, the method requires a lot of experimental data to construct the relationship between the measured electrical resistance change and the delamination crack. The reduction of the number of experiments is, therefore, required for the ERCM. In the present study, a new asymmetrical dual charge electric potential change method is introduced to estimate a delamination in the CFRP laminate. Delaminations are estimated using response surfaces as a solver of the inverse problem. Learning data of response surfaces are calculated by FEM analyses. This means the number of experiments can be significantly reduced. Actual delaminations in the CFRP laminates are successfully identified using the new method.
- Laminates and Composite Materials