Browsing by Author "Onur SAYMAN"

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    Elastic-plastic and residual stresses in clamped thermoplastic composite laminates loaded transversely
    (2011) Semih Benli; Fuat OKUMUŞ; MUSTAFA KARAMOLLA; Onur SAYMAN
    In this study, an elastic-plastic stress analysis was carried out in woven steelfibers- thermoplastic clamped composite laminates. The stacking sequences werechosen as [0/0]2, [15/-15]2, [30/-30]2 and [45/-45]2 for woven steel fibers –thermoplastic composites plates. The layers were chosen for symmetric andantisymmetric cases.The finite element solution was performed by using the ANSYS software. Solid186 element was utilized in the solution. Normal stress components at the clampededges were found to be higher than that at the mid point of the laminated plates. Normalstresses are tensile at the mid point of the clamped edges and compressive at the midpoint of the laminated plates. Then, the residual stress components were calculated inthe critical points of the composite laminates.
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    Numerical elastic plastic stress analysis in a woven steel reinforced composite thermoplastic cantilever beam
    (2012) MUSTAFA KARAMOLLA; METİN SAYER; Semih Benli; Onur SAYMAN
    In this study, an elastic-plastic stress analysis has been carried out in a thermoplasticcomposite cantilever beam. The thermoplastic composite beam was reinforced by steelwoven fibers. The beam was loaded uniformly. The orientation angles were chosen as0°, 15°, 30° and 45°. The finite element models of the beams were developed by usingANSYS software. The obtained results from the nonlinear analyses show that theresidual stress component of /sigma xis the highest at the fixed end at the upper and loweredges for the 0° orientation. However, it is the highest on or around the elastic plasticboundaries for the 15°, 30° and 45° orientations. The magnitude of the residual stresscomponent of /tau xyis found to be the highest at or around the axis of the beam at thefixed end. 30° orientation produces the highest stress component of /tau xyaround the axisof the beam. Also, it is found that the magnitude of the residual stress component of /sigma x is higher that that of the /tau xy.