Eldeeb A M, Shabana Y M, El-Sayed T A, Elsawaf A
Mechanical Design Department, Faculty of Engineering, Helwan University, P.O. Box 11718, El-Mataria, Cairo, Egypt.
Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin, 150001, PR China.
Sci Rep. 2023 Aug 21;13(1):13578. doi: 10.1038/s41598-023-39878-w.
Stresses reductions and/or raising the load-carrying capacity for a mechanical structure are always great dilemmas for researchers. In this article, a novel method is proposed, and its efficiency is examined for achieving these goals on functionally graded rotating nonuniform thickness discs. The originality of this method relies on comprising a geometrically well-defined area, into the whole structure, with certain homogeneous properties including density, thermal expansion coefficient, and elasticity matrix. This area acts as a reducer of the maximum values of various stress components. The solution of the magnetoelastic/magneto-thermoelastic problem is accomplished using the finite element method. The disc is subjected to partial uniform outer pressure, whereas, upon applying thermal loads; the thermal boundary conditions are considered symmetric. The proposed method is found to be beneficial as the obtained results demonstrated the ability to reduce the maximum stresses with different percentages depending on the location, angular width, and properties of the predefined area. This is reflected by an attainable decrease in the maximum compressive tangential stress and the von Mises stress by approximately 20.7% and 12.5%, respectively, under certain conditions.
对于研究人员而言，降低机械结构的应力和/或提高其承载能力始终是重大难题。本文提出了一种新方法，并针对功能梯度旋转非均匀厚度圆盘实现这些目标的效率进行了检验。该方法的独特之处在于，在整个结构中包含一个几何形状明确的区域，该区域具有包括密度、热膨胀系数和弹性矩阵在内的某些均匀特性。该区域可作为各种应力分量最大值的减小器。利用有限元法完成了磁弹性/磁热弹性问题的求解。圆盘承受部分均匀外压，而在施加热载荷时，热边界条件被视为对称的。结果表明，根据预定义区域的位置、角宽度和特性，所提出的方法能够以不同百分比降低最大应力，这被证明是有益的。在某些条件下，最大压缩切向应力和冯·米塞斯应力分别可实现约20.7%和12.5%的降低，这体现了该方法的有效性。
