Residual Stresses in SCS-6/Beta-21S Composites
Rangaswamy P, Jayaraman N
(Received 0 0; accepted 0 0)

Abstract
Residual stress profiles were determined using X-ray diffraction (XRD) procedures in SCS-6/Beta-21S composites in unidirectional [0]₄, cross-ply [0/90]_s, and quasi-isotropic [0/±45/90]_s lay-ups by sequentially electropolishing matrix layers off the outer surface. These experimental results were compared with the finite element model (FEM) calculations. Generally, the longitudinal stresses in the unidirectional [0]₄ composite was almost twice the transverse stresses, while for the cross-ply [0/90]_s composite, the longitudinal and the transverse stresses were similar in magnitude. The stress profile for the quasi-isotropic [0/±45/90]_s lay-up were intermediate between the unidirectional and cross-ply composites. These results show the strong influence of the underlying ply on the residual stresses in the outer ply. A 90° ply has greater influence than a 45° ply on the outer 0° ply of the composite.

Keywords:
coefficient of thermal expansion (CTE) mismatch, composites, cross-ply, finite element modeling (FEM), material removal effects, quasi-isotropic, residual stress, titanium matrix, undirectional, X-ray stress measurements

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Author Rangaswamy P, Jayaraman N Title Residual Stresses in SCS-6/Beta-21S Composites Symposium , Committee on