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      Nanoindenting the Chelyabinsk Meteorite to Learn about Impact Deflection Effects in asteroids

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          An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments

          The indentation load-displacement behavior of six materials tested with a Berkovich indenter has been carefully documented to establish an improved method for determining hardness and elastic modulus from indentation load-displacement data. The materials included fused silica, soda–lime glass, and single crystals of aluminum, tungsten, quartz, and sapphire. It is shown that the load–displacement curves during unloading in these materials are not linear, even in the initial stages, thereby suggesting that the flat punch approximation used so often in the analysis of unloading data is not entirely adequate. An analysis technique is presented that accounts for the curvature in the unloading data and provides a physically justifiable procedure for determining the depth which should be used in conjunction with the indenter shape function to establish the contact area at peak load. The hardnesses and elastic moduli of the six materials are computed using the analysis procedure and compared with values determined by independent means to assess the accuracy of the method. The results show that with good technique, moduli can be measured to within 5%.
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            Indentation size effects in crystalline materials: A law for strain gradient plasticity

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              Spectral reflectance characteristics of the meteorite classes

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                Author and article information

                Journal
                The Astrophysical Journal
                ApJ
                American Astronomical Society
                1538-4357
                February 01 2017
                January 25 2017
                : 835
                : 2
                : 157
                Article
                10.3847/1538-4357/835/2/157
                © 2017

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