Wang Junsheng, Xiao Jun, Huan Dajun, Yan Lei, Wang Zijie, Tao Zhiwei
R&D Center for Composites Industry Automation, College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Materials (Basel). 2024 Feb 5;17(3):757. doi: 10.3390/ma17030757.
The stress distribution in prestressed filament wound components plays a crucial role in determining the quality of these components during their operational lifespan. This article proposes a physical model to analyze the stress and deformation of prestressed wound composite components with arch-shaped sections. Drawing upon the principles of beam theory, we delve into the analysis of prestressed wound components with metal liners featuring arch-shaped sections. Our investigation revealed a noteworthy phenomenon termed the "additional bending moment effect" within prestressed wound components with arch-shaped sections. Furthermore, this study establishes a relationship between this additional bending moment and the external pressure. In addition, a 3D finite element (FE) model for prestressed wound components with arch-shaped sections incorporating metal liners was developed. The model's accuracy was validated through a comparison with prestressed wound experiments, showcasing an error margin of less than 2%. In comparison with prestressed wound components with circular cross-sections under identical load and dimensional parameters, it was observed that prestressed wound components with arch-shaped sections exhibit stress distributions in the arc segments akin to their circular counterparts, with differences not exceeding 5%. Notably, when the ratio of the straight segment length to the inner diameter of the arc segment inner is less than 4, the deformation on the symmetric plane of the arc segment in an arch-shaped component can be effectively considered as the summation of deformations in equivalent-sized arc and straight segments under identical loading conditions. This yields an equivalent physical model and a streamlined analysis and design methodology for describing the deformation characteristics of prestressed wound components with arch-shaped sections.
预应力纤维缠绕构件中的应力分布在决定这些构件在其使用寿命期间的质量方面起着至关重要的作用。本文提出了一个物理模型，用于分析具有拱形截面的预应力缠绕复合构件的应力和变形。借鉴梁理论原理，我们深入分析了带有金属内衬的拱形截面预应力缠绕构件。我们的研究揭示了在带有拱形截面的预应力缠绕构件中存在一种值得注意的现象，称为“附加弯矩效应”。此外，本研究建立了这种附加弯矩与外部压力之间的关系。此外，还开发了一个包含金属内衬的拱形截面预应力缠绕构件的三维有限元（FE）模型。通过与预应力缠绕实验进行比较验证了该模型的准确性，误差幅度小于2%。与相同载荷和尺寸参数下的圆形截面预应力缠绕构件相比，观察到带有拱形截面的预应力缠绕构件在弧段的应力分布与其圆形对应构件相似，差异不超过5%。值得注意的是，当直段长度与弧段内径之比小于4时，拱形构件弧段对称平面上的变形可以有效地视为相同加载条件下等效尺寸弧段和直段变形的总和。这产生了一个等效物理模型以及一种简化的分析和设计方法，用于描述带有拱形截面的预应力缠绕构件的变形特性。
