ISSN: 0884-6804
CODEN: JCTRER
Page Count: 7

Residual Stresses in SCS-6/Beta-21S Composites
Jayaraman, N
Graduate student and professor, University of Cincinnati, OH

Rangaswamy, P
Graduate student and professor, University of Cincinnati, OH

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

Paper ID: CTR10512J
DOI: 10.1520/CTR10512J
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