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Showing 1 to 15 of 15 for “"interlaminar stress"”.
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Interlaminar stress analysis of dropped-ply laminated plates and shells by a mixed method
… is developed for the linear analysis of interlaminar stresses in laminated composites, with special interest in laminates that contain terminated internal plies (dropped-ply laminates). Two models are derived, one for problems of generalized plane deformation and the other for the …
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Role of delamination and interlaminar fatigue in the failure of laminates with ply dropoffs
… with ply dropoffs to better understand the interlaminar stress field and delamination/damage characteristics in such laminates, as well as the relationship between the two based on the strength of materials approach. To gain key insights into the mechanisms and structural parameters that …
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A stepwise methodology for the calculation of interlaminar stresses in transversely-loaded grooved laminates
… in the development of a model to determine the interlaminar stress fields and the mechanisms that give rise to these stress fields in transversely-loaded grooved composite laminates was developed. The methodology consists of five steps, with each step representing a laminate configuration with …
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Two-dimensional to three-dimensional global/local finite element analysis of laminated composites in compression
… a central circular hole. The resulting stress fields for axial compression loads were examined in detail for several symmetric stacking sequences and hole sizes. Verification was based on comparison of the displacements and the stress fields with those accepted trends from previous free …
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Variable complexity modeling of postbuckled stiffeners for delamination initiation
… the nonlinear analysis. The three-dimensional stress field near the free edge is investigated by employing 20-node solid elements in that region. A dimensionless delamination index is calculated to investigate the severity of the interlaminar stress state. Numerical results correlated …
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Postbuckling Analysis of Delaminated Composite Plates Under Compression (Composite Laminates)
… to local buckling of the delaminated ligament, interlaminar stress transfer and strong material anisotropy, the singular stress field near the crack-tip must be considered for crack stability study. A rotational, singular hybrid finite element approach is taken for studying crack-tip stresses …
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Local buckling and crippling of composite stiffener sections
… thickness has a strong influence on the buckling stress and damage initiation mode. The inner corner radius strongly affects the buckling and crippling stresses for the I- and J-section specimens. Comparison of the numerical results from a computer code for shell analysis (STAGS) with experimental …
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Finite element analysis of geodesically stiffened cylindrical composite shells using a layerwise theory
… are used to perform the displacement field, stress, and first-ply failure analyses. The layerwise shell elements are used to model the shell skin and the layerwise beam elements are used to model the stiffeners. This arrangement allows the beam stiffeners to be assembled directly into the …
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Isogeometric Finite Element Code Development for Analysis of Composite Structures
… diminishing property of Nurbs basis for stress analysis of composite and sandwich beams and plates. This research also computes stress concentration factor in a composite plate with a hole. Isogeometric nonlinear/linear finite element code is developed for static and dynamic analysis of …
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Delamination initiation in postbuckled dropped-ply laminates
… predicting delamination is based on a quadratic interlaminar stress criterion evaluated at a characteristic distance from the ply drop-off. The details of the complex state of stress in the region of the thickness discontinuity are studied using three-dimensional solid elements, while the uniform …
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Evaluation of efficiency of partial hybrid finite element method using composite laminates with crack
… elements is examined by the determination of interlaminar stress fields around interior delamination crack tips in composite laminates subjected to out-of-plane loading. The stress field consisting of both in-plane and out-of-plane components around a through thickness edge crack in a …
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Nonlinear analysis of laminated fibrous composites
… approximations are used to represent lamina stress-strain behavior and percent retention curves are employed to model the variation of properties with temperature. Balanced, symmetric laminates comprised of either boron/epoxy, graphite/epoxy, or borsic/ aluminum are analyzed using a …
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Local and Global Sensitivity Analysis of Thin Ply Laminated Carbon Composites
… of laminates constructed from very thin plies. Interlaminar shear and normal stress components have been shown to be concentrated on the edges, the so-called edge effect, of unidirectional laminates at the interface between plies of different fiber orientation. Research has shown that decreasing …
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Numerical simulation of damage and progressive failures in composite laminates using the layerwise plate theory
… and therefore has the ability to capture the interlaminar stress fields near the free edges and cut outs more accurately. The progressive failure algorithm is based on the assumption that the material behaves like a stable progressively fracturing solid. A three-dimensional stiffness reduction …
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Geometrically Nonlinear Stress Recovery in Composite Laminates
… />homogeneous, isotropic materials. Therefore, a stress analysis of a composite<br />laminate is not complete without an accurate representation of the transverse<br />(out-of-plane) stresses.<br /><br />Stress recovery is a common method to estimate the transverse stresses from a<br />plate or …