The Technique Of X-ray Diffraction For Stresses
Quantification In Metallic Elements
Author(s)
S. Sánchez-Beitia & J. Barrallo
Abstract
X-ray diffraction technique for residual stresses quantification in metallic parts
has been widely applied for decades in many industrial sectors. This paper
describes the calibration at a laboratory of this technique in order to adapt it for
the quantification of the mechanical stresses in metallic structures. A small
structure specifically built for this research has been repeatedly loaded at the
laboratory. In each load level the stresses in a bar of the structure have been
quantified by means of X-ray diffraction technique. Correlation between the
stresses deducted experimentally and the applied stresses is excellent. As a
conclusion it can be stated that the X-ray diffraction technique can be used for
stress analysis in metallic elements. The technique is absolutely non destructive
and appropriate to be used in Heritage Constructions.
Keywords: structural stresses, residual stresses, X-ray diffraction technique,
metallic structures.
1 Introduction
One of the most interesting challenges of the scientific community in the
structural analysis field is the development of new non destructive experimental
techniques (NDT). The research here presented deals with the applicability of the
X-ray diffraction technique for stresses quantification in metallic structures. The
main problem in all cases for in-situ stresses measurements is that they have
already been applied. Considering that it is not possible to apply any load (or
unload) to a real structure, a parameter needs to be selected that can be
determined experimentally. The experimental value of this parameter should lead
to the deduction of the stress states. In this case the appropriate parameter is the
separation \“d” of the crystallographic planes of the steel phases (ferrite,
Keywords
structural stresses, residual stresses, X-ray diffraction technique,
metallic structures
Related Book
Other papers in this volume
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