Casarejos Enrique, Riol Jose C, Lopez-Campos Jose A, Segade Abraham, Vilan Jose A
Department Mechanical Engineering, University of Vigo, E-36310 Vigo, Spain.
Materials (Basel). 2019 Feb 5;12(3):489. doi: 10.3390/ma12030489.
In this paper, the reliability of a finite element (FE) model including carbon-fibre reinforced plastics (CFRPs) is evaluated for a case of a complex thin-wall honeycomb structure designed for a scientific instrument, such as a calorimeter. Mechanical calculations were performed using FE models including CFRPs, which required a specific definition to describe the micro-mechanical behaviour of the orthotropic materials coupled to homogeneous ones. There are well-known commercial software packages used as powerful tools for analyzing structures; however, for complex (many-parts) structures, the models become largely time consuming for both definition and calculation, which limits the appropriate feedback for the structure's design. This study introduces a method to reduce a highly nonlinear model, including CFRPs, into a robust, simplified and realistic FE model capable of describing the deformations of the structure with known uncertainties. Therefore, to calculate the deviations of our model, displacement measurements in a reduced mechanical setup were performed, and then a variety of FE models were studied with the objective to find the simplest model with reliable results. The approach developed in this work leads to concluding that the deformations evaluated, including the uncertainties, were below the actual production tolerances, which makes the proposed model a successful tool for the designing process. Ultimately, this study serves as a future reference for complex projects requiring intensive mechanical evaluations for designing decisions.
在本文中，针对一种为科学仪器（如量热计）设计的复杂薄壁蜂窝结构，评估了包含碳纤维增强塑料（CFRP）的有限元（FE）模型的可靠性。使用包含CFRP的FE模型进行了力学计算，这需要特定的定义来描述与均质材料耦合的正交各向异性材料的微观力学行为。有一些著名的商业软件包被用作分析结构的强大工具；然而，对于复杂（多部件）结构，模型的定义和计算都非常耗时，这限制了对结构设计的适当反馈。本研究介绍了一种方法，可将包含CFRP的高度非线性模型简化为一个强大、简化且现实的FE模型，该模型能够描述具有已知不确定性的结构变形。因此，为了计算我们模型的偏差，在简化的力学设置中进行了位移测量，然后研究了各种FE模型，目的是找到结果可靠的最简单模型。这项工作中开发的方法得出结论，所评估的变形（包括不确定性）低于实际生产公差，这使得所提出的模型成为设计过程中的一个成功工具。最终，本研究为需要进行密集力学评估以做出设计决策的复杂项目提供了未来参考。
