J044033 CFRP厚板におけるデントの影響を考慮した電気抵抗変化による損傷モニタリング([J04403]知的材料・構造システム(3))

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Laminated Carbon Fiber Reinforced Polymer (CFRP) composites easily have delamination cracks resulting from small impact loads such as from dropped tools. Since the delamination cracks are usually difficult to detect by visual inspection, the CFRP laminates must have high knockdown capabilities to confirm their structural integrity. The present paper investigates Electrical Resistance Change Method (ERCM) for thick CFRP laminates. Authors have proposed the damage identification method for CFRP using the ERCM and confirmed its applicability for beams and thin plate-type specimens in the previous study. However, a dent is made for thick CFRP when an impact load is applied, and the dent causes electrical resistance decreases because the dent causes decreases of the thickness. The present study focuses on the electrical resistance decrease by the dent, and the electrical resistance decrease is used for monitoring delamination location. FEM analyses are used to obtain electrical resistance change decrease distributions. The estimation results are compared with the experimental data. 55 cases of FEM analyses were performed here to obtain the relationship between the damage and the electrical resistance changes. Using these results, response surfaces are made to obtain relationship between the fraction of electrical resistance change and delamination location. Experimental data are input into the obtained response surface and delamination locations are estimated. Several experimental data are input into the response surface and the estimations of delamination locations are made. As a result, the response surface made from the FEM analyses predicted successfully the damage location for the thick CFRP laminates.
一般社団法人日本機械学会の論文
2011-09-11

J044033 CFRP厚板におけるデントの影響を考慮した電気抵抗変化による損傷モニタリング([J04403]知的材料・構造システム(3))

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