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In this paper, the attention is restricted to the cases of symmetric angleply laminates. The stress distributions are studied at the ply level with an emphasison the interface effect in the central region of symmetric composite laminates. It hasbeen discovered that the numerical distributions of stresses in angle-ply laminates arequite different from the results by the classical laminate theory. There are in-plane stressconcentrations near ply interface in the interior region of laminated composites due to theabrupt change of fiber orientation. Because interlaminar stresses and thus delaminationcan arise in any gradient stress field in a laminated composite, there exist interlaminarstresses near the ply interface in the interior region. The effects of the material propertieson the concentration of in-plane stress are also discussed.
In this paper, the attention is restricted to the cases of symmetric angle ply laminates. The stress distributions are studied at the ply level with an emphasis on the interface effect in the central region of symmetric composite laminates. It hasbeen discovered that the numerical distributions of stresses in angle-ply laminates arequite different from the results by the classical laminate theory. There are in-plane stressconcentrations near ply interface in the interior region of laminated composites due to theabrupt change of fiber orientation. Because interlaminar stresses and thus delaminationcan arise in any gradient stress field in a laminated composite, there exist interlaminarstresses near the ply interface in the interior region. The effects of the material properties on the concentration of in-plane stress are also discussed.