Reducing Effects of Initial Imperfection by Investment in the Orthotropic Characteristics of Laminated Composite Plate

Q3 Engineering

Open Civil Engineering Journal Pub Date : 2023-07-01 DOI:10.28991/cej-2023-09-07-03

Wisam Hamzah Mohammed, S. Shambina, H. Ammash

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引用次数: 0

Abstract

The target of this study is to reduce the impact of initial imperfection on the nonlinear dynamical performance of laminated composite plates by taking advantage of the orthotropic characteristics of laminated composite plates by changing carbon fiber sawing in the mass matrix and fiber orientation with different patterns and studying the effect of this optimization without and with initial imperfection (Wo) and different aspect ratios (W/L) and various boundary conditions through analyzing the load-displacement responses for plates under axial in-plane compressive loads by using the FORTRAN 94 programming language. Von-Karman's assumptions are utilized to include geometric nonlinearity for nine node isoperimetric quadrilateral components with five degrees of freedom into the structural model, which is based on first-order shear deformation theory. The Newmark’s implicit time integration method and Newton-Raphson iteration concurrently are employed to solve the nonlinear governing equation in conjunction. The study proved the effectiveness of the carbon fiber's varying geometric distribution and the difference in its directions in reducing the negative effects of the initial imperfection on the large elastic-plastic displacement and critical buckling. To highlight the veracity of the results, some of them have been validated against those found in the literature review. Doi: 10.28991/CEJ-2023-09-07-03 Full Text: PDF

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降低初始缺陷投资对层合板正交各向异性特性的影响

本研究的目标是利用复合材料的正交异性特性，通过改变碳纤维在质量基体中的锯切方式和纤维取向的不同模式，降低初始缺陷对复合材料层合板非线性动态性能的影响，并通过分析不同的长径比(W/L)和不同的边界条件，研究无初始缺陷和有初始缺陷(Wo)时的优化效果采用FORTRAN 94编程语言对轴向面内压缩荷载作用下板的荷载-位移响应进行了数值模拟。利用Von-Karman假设，将五自由度九节点等边四边形构件的几何非线性纳入基于一阶剪切变形理论的结构模型中。采用Newmark隐式时间积分法和Newton-Raphson迭代法联合求解非线性控制方程。研究证明了碳纤维几何分布的变化及其方向的差异在减小初始缺陷对大弹塑性位移和临界屈曲的负面影响方面的有效性。为了强调结果的准确性，其中一些已经与文献综述中的发现进行了验证。Doi: 10.28991/CEJ-2023-09-07-03全文:PDF

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来源期刊

Open Civil Engineering Journal Engineering-Civil and Structural Engineering

CiteScore

1.90

自引率

0.00%

发文量

期刊介绍： The Open Civil Engineering Journal is an Open Access online journal which publishes research, reviews/mini-reviews, letter articles and guest edited single topic issues in all areas of civil engineering. The Open Civil Engineering Journal, a peer-reviewed journal, is an important and reliable source of current information on developments in civil engineering. The topics covered in the journal include (but not limited to) concrete structures, construction materials, structural mechanics, soil mechanics, foundation engineering, offshore geotechnics, water resources, hydraulics, horology, coastal engineering, river engineering, ocean modeling, fluid-solid-structure interactions, offshore engineering, marine structures, constructional management and other civil engineering relevant areas.