Abstract
X-ray diffraction is a powerful tool for the investigation of interlaminar stresses in fiber reinforced composites. The structural and residual stress in the material can be evaluated by measuring the strain in embedded particles using X-ray diffraction. The measured state of strain in the detection particles is composed of the initial strain due to the manufacturing process and the structural strain due to an applied global traction of the composite specimen. The relationship between the strain in the particles and the stress in the material is denoted as X-ray elastic constants. Due to the complex measurement technique and the presence of statistic variations, the influence of measurement errors has to be investigated closely and taken into account during the calculation of the X-ray elastic constants. The method allows the measurement of the complete three-dimensional state of stress in the interior of composite materials including the separation of residual and structural stresses.
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