Analysis of Indentation : Implications for Measuring Mechanical Properties With Atomic Force Microscopy  

Oleh:

Costa, K. D. ; Yin, F. C. P.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 121 no. 5 (1999), page 462-471.
Topik: ATOMIC POWER; indentation; implications; mechanical properties; atomic force; microscopy

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ52.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

Indentation using the atomic force microscope (AFM) has potential to measure detailed micromechanical properties of soft biological samples. However, interpretation of the results is complicated by the tapered shape of the AFM probe tip, and its small size relative to the depth of indentation. Finite element models (FEM s) were used to examine effects of indentation depth, tip geometry, and material non linearity and heterogeneity on the finite indentation response. Widely applied infinitesimal strain models agreed with FEM results for linear elastic materials, but yielded substantial errors in the estimated properties for non linear elastic materials. By accounting for the indenter geometry to compute an apparent elastic modulus as a function of indentation depth, nonlinearity and heterogeneity of material properties may be identified. Furthermore, combined finite indentation and biaxial stretch may reveal the specific functional form of the constitutive law - a requirement for quantitative estimates of material constants to be extracted from AFM indentation data.

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