In this work we present a preliminary investigation by means of neutron diffraction experiment to determine the residual stress state in three different iron meteorites (Chinga, Sikhote Alin and Nantan). Because of the very peculiar microstructural characteristic of this class of samples, all the systematic effects related to the measuring procedure - such as crystallite size and composition - were taken into account and a clear differentiation in the statistical distribution of residual stress in coarse and fine grained meteorites were highlighted. Moreover, the residual stress state was statistically analysed in three orthogonal directions finding evidence of the existence of both type I and type II residual stress components. Finally, the application of von Mises approach allowed to determine the distribution of type II stress.

Type I and type II residual stress in iron meteorites determined by neutron diffraction measurements / CAPORALI, Stefano; PRATESI Giovanni; Kabra, Saurabh; Grazzi, Francesco. - In: PLANETARY AND SPACE SCIENCE. - ISSN 0032-0633. - ELETTRONICO. - 153:(2018), pp. 72-78. [10.1016/j.pss.2017.12.015]

Type I and type II residual stress in iron meteorites determined by neutron diffraction measurements

CAPORALI, Stefano;PRATESI Giovanni;Grazzi, Francesco
2018

Abstract

In this work we present a preliminary investigation by means of neutron diffraction experiment to determine the residual stress state in three different iron meteorites (Chinga, Sikhote Alin and Nantan). Because of the very peculiar microstructural characteristic of this class of samples, all the systematic effects related to the measuring procedure - such as crystallite size and composition - were taken into account and a clear differentiation in the statistical distribution of residual stress in coarse and fine grained meteorites were highlighted. Moreover, the residual stress state was statistically analysed in three orthogonal directions finding evidence of the existence of both type I and type II residual stress components. Finally, the application of von Mises approach allowed to determine the distribution of type II stress.
2018
153
72
78
CAPORALI, Stefano; PRATESI Giovanni; Kabra, Saurabh; Grazzi, Francesco
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1114139
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