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采用热成型制造的热塑性加压乘客门的优化设计与测试

Optimal Design and Testing of a Thermoplastic Pressurized Passenger Door Manufactured Using Thermoforming.

作者信息

Růžek Roman, Krena Josef, Doubrava Radek, Tkadlec Josef, Kadlec Martin, Bělský Petr

机构信息

Materials and Technologies Department, VZLU-Czech Aerospace Research Centre, 199 05 Prague, 130 Beranových, Czech Republic.

Latécoère Czech Republic, 199 02 Praha 9, 65 Beranových, Czech Republic.

出版信息

Polymers (Basel). 2021 Oct 2;13(19):3394. doi: 10.3390/polym13193394.

DOI:10.3390/polym13193394
PMID:34641209
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8512071/
Abstract

The present paper documents and discusses research work associated with a newly designed passenger door structure demonstrator. The composite structure was manufactured from carbon-fiber-reinforced thermoplastic resin. A composite frame with a variable cross-section was designed, optimized, and fabricated using thermoforming technology. Both numerical simulations and experiments supported structural verification according to the damage tolerance philosophy; i.e., impact damage is presented. The Tsai-Wu and maximal stress criteria were used for damage analysis of the composite parts. Topological optimization of the metal hinges from the point of view of weight reduction was used. All expected parameters and proposed requirements of the mechanical properties were proved and completed. The door panel showed an expected numerically evaluated residual strength (ultimate structure load) as well as meeting airworthiness requirements. No impact damage propagation in the composite parts was observed during mechanical tests, even though visible impact damage was introduced into the structure. No significant difference between the numerical simulations and the experimentally measured total deformation was observed. Repeated deformation measurements during fatigue showed a nonlinear structure behavior. This can be attributed to the relaxation of thermoplastics.

摘要

本文记录并讨论了与新设计的乘客门结构演示器相关的研究工作。该复合结构由碳纤维增强热塑性树脂制成。设计、优化并采用热成型技术制造了具有可变横截面的复合框架。数值模拟和实验均根据损伤容限原理支持结构验证，即呈现了冲击损伤。采用蔡 - 吴准则和最大应力准则对复合部件进行损伤分析。从减轻重量的角度对金属铰链进行了拓扑优化。所有预期的参数以及机械性能的提出要求均得到验证和完善。门板显示出预期的数值评估残余强度（极限结构载荷），并满足适航要求。在机械测试过程中，尽管结构中引入了可见的冲击损伤，但未观察到复合部件中的冲击损伤扩展。数值模拟与实验测量的总变形之间未观察到显著差异。疲劳过程中的重复变形测量显示出结构的非线性行为。这可归因于热塑性塑料的松弛。

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