Microindentation techniques

B. R. Lawn and R. J. Blau, eds.. Microindentation Techniques in Materials Science and Engineering, International Metakographic Society, ASTM STP 889, 1986. 

The microindentation technique (or push-out test as opposed to the pull-out test) is a single fiber test capable of examining libers embedded in the actual composite. The... 

Prasad, K.V. Sheen, D.B. Sherwood, J.N. Fracture property studies of paracetamol single crystals using microindentation techniques. Pharm. Res. 2001, 18 (6), 867-872. 

One can conclude that the microindentation technique allows the strain-induced polymorphic transition in PBT to be followed. The observed rather abrupt variation in H (within 2-4% of external deformation) makes the method competitive with respect to sensitivity to other commonly used techniques such as WAXS, infrared spectroscopy, Raman spectroscopy, etc. (Tashiro Tadokoro, 1987). Furthermore, by applying the additivity law it is possible to calculate the microhardness of completely crystalline PBT, comprising crystallites of the /6-type, as = 122 MPa. This technique can also be used to examine the stress-induced polymorphic behaviour of PBT in copolymers and blends as will be demonstrated in the following sections. 

D. B. Marshall and B. R. Lawn, in Microindentation Techniques for Materials Science and Engineering, P. Blau and R. Lawn (Eds), ASTM STP 889, Philadelphia, Pennsylvania,... 

Fig. 1 Single cell elasticity measurements with microindentation technique. (A) AFM allows both live cell imaging and mechanical testing (e.g., microindentation) in near physiological conditions. The AFM tip attached to a cantilever descents slowly to a surface and causes an indentation. The depth of indentation is detected by laser light diffraction pattern. (B) Typical force-distance curves are obtained for hard and soft surfaces and usually analyzed with the classical Hertz model that relates the applied force to the indentation depth.

Blau PJ, Lawn BR (1986) Microindentation techniques in materials science and engineering a symposium sponsored by ASTM Committee E-4 on Metallography and by the International Metallographic Society. American Society for Testing Materials. Ann Arbor, MI Chou SY, Krauss PR, Renstrom PJ (1996) Nanoimprint lithography. J Vac Sci Technol B 14(6) 4129-4133... 

Marshall, D.B., Lawn, B.R., 1986. Indentation of brittle materials. In P. Plan, B.R. Lawn (Eds.), Microindentation Techniques in Material Science and Engineering. ASTM STP 889, ASTM, p. 26. 

Westrich, R.M., 1986. Use of the scanning electron microscope in microhardness testing of high-hardness materials, microindentation techniques. Materials Science and Engineering ASTM STP 889, Philadelphia, p. 196. 

A. L. Yurkov and R. C. Bradt, Load Dependence of Hardness of SIALON Based Ceramics, in Fracture Mechanics of Ceramics, Vol 11, Eds. R. Bradt et al., (Plenum Press, NY, 199S), pp. 369 378. P. M. Sargent, Use of the Indention Size Effect on Microhardness for Materials Characterization, in Microindentation Techniques in Materials Science and Engineering, ASTM STP 889, eds. P. J. Blau and B. R. Lawn, (ASTM, West Conshohocken, PA, 1986), pp. 160 174. 

Micro corrosion cells, 38-15 Microfilled composites, 41-6 Microfluidic gradient generator, in cell-biomaterial microscale interactions study, 46-7-46-9 Microindentation technique, in cell-biomaterial microscale interactions study, 46-9... 

To avoid any cyclic loading on the specimen during visual detection of fiber debonding, Netravali et al. [105] developed a test procedure to monitor the load and depth of indentation continuously as a characteristic change in the load-depth curve. They used a slightly modified microindentation technique to determine the... 

Fig. 19. Interfacial stress distribution for Nicalon (SiC) fibers in an aluminosilicate glass matrix obtained using the microindentation technique [104],...

Single fiber fragmentation technique Ksi/MPa (IJd) Microindentation technique Ksi/MPa Microbond technique Ksi/MPa... 

Microindentation Techniques in Materials Science and Engineering (eds P.J. Blau and B.R. Lawn), ASTM International, Philadelphia, PA, p. 72. 

Special techniques to measure the microhardness use microindentation techniques.t ... 

The significance of the strand microstructure and the deposition of hydration products in it led to several studies inwhich indentation and micro-indentation techniques were applied to characterize the strand and the nature of the matrix around individual filaments within the strand [50-52]. Zhuand Bartos [51] applied microindentation techniques to push in individual filaments to determine the resistance to their slip and through that assess the development of the microstructure within the strand. They demonstrated that in young composites the microstructure and interfacial bond of individual filaments was weaker within the fibre bundle than at the bundle-matrix interface. Upon ageing the inner microstructure within the strand became denser and stronger, and the resistance to the push-in force of the internal filaments increased to become similar to that of the external filaments. Purnell etal. [52] resolved by thin section petrographic techniques similar characteristics of strand fi 11 i ng upon ageing, but commented that the deposits of hydration products within the strand were not uniform and monolithic. 

The ability to probe surface mechanical properties with nanometer-scale lateral and vertical resolutions is critical for many emerging applications. For nanomechanical prohing experiments, one usually exploits either AFM or microindentation techniques. AFM enables characterization of mechanical properties of the sample through probe indentation and shear. Mechanical tests include indentation, wear, and force-distance curves measured upon normal and shear loading. ... 

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