Volume 13, No. 3, 2019
Received: 2019/08/27, Accepted:
Authors:
Ghazi Abu-Farsakh; Sora Al-Rosan;
Abstract:
In this paper, the distribution of stresses in an open circular cylindrical thin-shell panel having a central square hole and various shell curvatures and is subject to uniform axial tension loading is investigated. Analysis is carried out using both linear and geometrically nonlinear behaviors using the finite element analysis computer program ABAQUS. Shell panels are assumed to consist of four symmetrical laminas [θ/-θ]s that are made of a fibrous Graphite/Epoxy (AS/3501) composite. Fiber-orientation angles varied from θ= 0⁰ to 90⁰ in steps of 15⁰. Three types of shell curvatures are considered; namely, shallow shell (SS), moderately-deep shell (MDS) and
deep shell (DS) with all edges being clamped. The presence of a central hole resulted in the redistribution of stresses along the hole perimeter. Accordingly, this changed the general trend of stresses from tension to compression in the hole zone and caused stress concentration at hole corners. Also, the peak stresses are
increased due to increasing the shell curvature. Type of finite element analysis showed a small effect on shell stresses. In geometrically nonlinear analysis, stresses are decreased and stress redistribution becomes more uniform than that corresponding to linear analysis. Moreover, stress concentration factors (SCFs) are slightly
affected due to type of analysis.
Keywords:
Stress concentration factor, Central rectangular hole, Fibrous composite laminate, Open cylindrical shell, Geometric nonlinearity