PSI - Issue 32
R.I. Izyumov et al. / Procedia Structural Integrity 32 (2021) 87–92 Author name / Structural Integrity Procedia 00 (2019) 000–000
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4. Conclusion Finite element modeling of nanoindentation of the filled elastomer was carried out. The results showed that a material with a flat homogeneous surface and an inhomogeneous subsurface layer (with filler particles) reacts differently to the penetration of an AFM probe. This reaction depends on the size of the particles and the depth of its location. Since the depth of penetration and the subsequent adhesion during the lift of the probe depend on this reaction, the presence of particles will be reflected in the phase portrait of the surface obtained in the semicontact AFM mode. In this way, we can expose the internal structure of the subsurface layer using the very fast standard semicontact surface scanning mode. At this stage of the study, calculations were carried out for inclusions of different sizes and locations in the material. The results showed that this approach really allows one to estimate the size and depth of the filler particles, since the character of the indentation curves for different cases has a significantly qualitative difference. It was confirmed that this approach makes it possible to estimate the size and depth of the filler particles, since the character of the curves for different cases has a pronounced qualitative difference. This means that we can get an unambiguous transformation of the surface stiffness map to the structure map of the subsurface layer. Subsequent studies will be carried out for three-dimensional formulation, and will be aimed at developing a method for transforming the phase portrait into a stiffness map. It will finally connect the phase portrait with the structure map of the subsurface layer. Acknowledgements The reported study was funded by RFBR and Perm Territory, project number 20-48-596013. The experimental part was carried out with the support of the state budget theme AAAA-A20-120022590044-7. References Gadelrab, K., Bonilla, F., Chiesa, M., 2012. Densification modeling of fused silica under nanoindentation. Journal of Non-Crystalline Solids 358(2), 392–8. Garcia, R., 2020. Nanomechanical mapping of soft materials with the atomic force microscope: methods, theory and applications. Chem. Soc. Rev. 49, 5850–84. Garcia, R., Perez, R., 2002. Dynamic atomic force microscopy methods. Surface Science Reports 47, 197–301. Haviland, D., 2017. Quantitative force microscopy froma dynamic point of view. Current Opinion in Colloid & Interface Science 27, 74–81. Herruzo, E., Perrino, A., Garcia, R., 2014. Fast nanomechanical spectroscopy of soft matter. Nature Communications 5, 3126 . Killgore, J. et al., 2011. Viscoelastic Property Mapping with Contact Resonance Force Microscopy. Langmuir 27, 13983–7. Li, Y. et al., 2018. Mapping the elastic properties of two-dimensional MoS 2 via bimodal atomic force microscopy and finite element simulation. Computational Materials 49, 1–8. Magerle, R., Dehnert, M., Voigt, D., Bernstein, A., 2020. Nanomechanical 3D Depth Profiling of Collagen Fibrils in Native Tendon. Analytical Chemistry 92, 8741–9. Maivald, P. et al., 1991. Using force modulation to image surface elasticities with the atomic force microscope. Nanotechnology 2, 103–6. Reggente, M., Rossi, M., Angeloni, L. et al., 2015. Atomic force microscopy techniques for nanomechanical characterization: a polymeric case study. JOM 67, 849. Stühn, L., Fritschen, A., Choy, J., Dehnert, M., Dietz, C., 2019. Nanomechanical sub-surface mapping of living biological cells by force microscopy. Nanoscale 11, 13089–97. Tang, G. et al., 2018. Investigation of micromechanical properties of hard sphere filled composite hydrogels by atomic force microscopy and finite element simulation. Journal of the Mechanical Behavior of Biomedical Materials 78, 496–504. Tang, G. et al., 2019. Biomechanical heterogeneity of living cells: comparison between atomic force microscopy and finite element simulation. Langmuir 35, 7578-87. Wang, H., 2019. Stress dependence of indentation modulus for carbon fiber in polymer composite. Science and Technology of Advanced Materials 20, 412-20. Zhang, D., Wang, X., Song, W. et. al., 2017. Analysis of crystallization property of LDPE/Fe3O4 nanodielectrics based on AFM measurements. Journal of Material Science. Materials in Electronics 28, 3495. Zhang, M., 2018. Determination of mechanical properties of polymer interphase using combined atomic force microscope (AFM) experiments and finite element simulations. Macromolecules 51, 8229–40. Zheng, L., 2016. Mechanical characterization of PMMA by AFM nanoindentation and finite element simulation. Mater. Res. Express 3, 115302.
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