Composite, Hybrid, and Multifunctional Materials, Volume 4

9.6 Conclusion A measurement of deformation at micro area of CFRP is performed with digital image correlation method. Tensile testing is developed to perform in scanning electron microscope, and obtained SEM images are used. Charge up and edge effect is seen around edge of fiber cross section, countermeasures must be worked out since it affects to result directly. Random pattern for digital image correlation using colloidal silica particle is proposed and verified. Created pattern is good enough to measure tendency of deformation, but improvement is necessary to discuss accuracy and deformation around fiber interface. It should be smaller, distributed entire observing area, clear, increases amount and placed uniformly. The results of distribution gained shows trend of deformation at epoxy area between fibers at loading direction. However, precision of the result is not sufficient and there must be improvement of experiment. References 1. Koyanagi J, Adachi Y, Arikawa S, Yoneyama S (2012) Time-dependent internal damage progress and residual strength in notched composite laminates. J Solid Mech Mater Eng 6(6):701–710 2. Totry E, Molina-Aldaregu´ıa J, Gonza´lez C, Llorca J (2010) Effect of fiber matrix and interface properties on the in-plane shear deformation of carbon-fiber reinforced composites. Compos Sci Technol 70(6):970–980 3. Hinz S, Omoori T, Hojo M, Schulte K (2009) Damage characterisation of fibre metal laminates under interlaminar shear load. Compos Part A Appl Sci Manuf 40(6–7):925–931 4. Jime´nez FL, Pellegrino S (2012) Constitutive modeling of fiber composites with a soft hyper elastic matrix. Int J Solids Struct 49 (3–4):635–647 5. Vaughan TJ, McCarthy CT (2011) A micromechanical study on the effect of intra-ply properties on transverse shear fracture in fibre reinforced composites. Compos Part A Appl Sci Manuf 42(9):1217–1228 6. Lecomte-Grosbras P, Paluch B, Brieu M, Saxce´ GD, Sabatier L (2009) Interlaminar shear strain measurement on angle-ply laminate free edge using digital image correlation. Compos Part A Appl Sci Manuf 40(12):1911–1920 7. Wang H, Xie H, Li Y, Zhu J (2012) Fabrication of micro-scale speckle pattern and its applications for deformation measurement. Meas Sci Technol 23:035402 8. Sutton MA, Li N, Joy DC, Reynolds AP, Li X (2007) Scanning electron microscopy for quantitative small and large deformation measurements part I: SEM imaging at magnifications from 200 to 10,000. Exp Mech 47(6):775–787 9. Sutton MA, Li M, Garcia D, Cornille N, Orteu JJ, McNeill SR, Schreier HW, Li X, Reynolds AP (2007) Scanning electron microscopy for quantitative small and large deformation measurements part II: experimental validation for magnifications from 200 to 10,000. Exp Mech 47 (6):789–804 10. Jin H, Lu WY, Korellis J (2008) Micro-scale deformation measurement using the digital image correlation technique and scanning electron microscope imaging. J Strain Anal Eng Des 43(8):719–728 11. Kang J, Jain M, Wilkinson DS, Embury JD (2005) Microscopic strain mapping using scanning electron microscopy topography image correlation at large strain. J Strain Anal Eng Des 40(6):559–570 12. Sutton MA, Li N, Garcia D, Cornille N, Orteu JJ, McNeill SR, Schreier HW, Li X (2006) Metrology in a scanning electron microscope: theoretical developments and experimental validation. Meas Sci Technol 17(10):2613–2622 13. Canal LP, Gonza´lez C, Molina-Aldaregu´ıa J, Segurado J, Llorca J (2011) Application of digital image correlation at the micro scale in fiberreinforced composites. Compos Part A Appl Sci Manuf 43(10):1630–1638 14. Xu Z-H, Li X-D, Sutton MA, Li N (2008) Drift and spatial distortion elimination in atomic force microscopy images by the digital image correlation technique. J Strain Anal Eng Des 43(8):729–743 15. Sun Y, Pang JH (2006) AFM image reconstruction for deformation measurements by digital image correlation. Nanotechnology 17 (4):933–939 16. Winiarski B, Schajer GS, Withers PJ (2012) Surface decoration for improving the accuracy of displacement measurements by digital image correlation in SEM. Exp Mech 52(7):793–804 9 In Situ SEM Deformation Behavior Observation at CFRP Fiber-Matrix Interface 73

RkJQdWJsaXNoZXIy MTMzNzEzMQ==