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    Analytical and finite element comparisons of stress intensity factors of composite materials
    (Elsevier Sci Ltd, 2000) Dirikolu, MH; Aktas, A
    In this paper, a comparative study regarding the determination of stress intensity factors (SIF) for non-standard thin composite plates is presented. Carbon-epoxy composite plates are considered for the study. Unnotched specimens and specimens containing either 4, 6 or 8 mm diameter holes are prepared and then tested. Based on the experimental data thus obtained, two analytical approaches and a finite element fracture analysis tool called FRANC2DL have been used to compare the critical SIF values for this composite material. (C) 2000 Elsevier Science Ltd. All rights reserved.
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    An experimental and numerical investigation of strength characteristics of carbon-epoxy pinned-joint plates
    (Elsevier Sci Ltd, 2004) Aktas, A; Dirikolu, MH
    An experimental and numerical study has been carried out to investigate the strength of a pinned-joint carbon epoxy composite plate with [0degrees/45degrees/-45degrees/90degrees]s and [90degrees/45degrees/-45degrees/0degrees]s stacking configurations. The experiments were carried out according to the ASTM D953 standard [Standard Test method for Bearing Strength of Plastics, ASTM Designation, 342-346], and the numerical analyses were performed by the finite element method. The ratio of the edge distance to the pin diameter (E/D), and the ratio of the specimen width to the pin diameter (W/D) were systematically varied during analyses. The results from both analyses show firstly that the prepared specimen configurations give bearing mode, secondly that the [90degrees/45degrees/-45degrees/0degrees]s configuration is stronger when compared to [0degrees/45degrees/-45degrees/90degrees]s, and finally that both configurations reach their upper limit bearing strengths when E/D and W/D ratios are equal or greater than 4. (C) 2004 Elsevier Ltd. All rights reserved.
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    Failure analysis of two-dimensional carbon-epoxy composite plate pinned joint
    (Taylor & Francis Inc, 1999) Aktas, A; Karakuzu, R
    The aim of this study is to investigate failure strength and failure mode of a mechanically fastened carbon-epoxy composite plate of arbitrary orientation. The failure load and the failure mode are analyzed numerically and experimentally. The numerical method includes two steps. First, the stress distribution in the plate is calculated by the use of finite-element method. Second, the failure load and the failure mode are predicted by means of Tsai-Hill and fiber tensile-compressive failure criteria. A computer program was developed which can be used to calculate the failure load, the failure mode, and the propagation of failure. The distance-to-diameter, E/D, and width-to-diameter, W/D, ratios in the plate are changed from 1 to 5 and 2 to 5, respectively. It is found that full bearing strength is developed when E/D and W/D ratios are equal to or greater than 4.