湿热环境条件下 CFRP/Al 单层铆接接头力学性能的模型研究

Shiguang Zhang, X. Qin, Shipeng Li, Hao Li, Yanwei Xu, Guoyu Fu
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引用次数: 0

摘要

碳纤维增强聚合物(CFRP)和铝合金因其优异的机械性能和轻质特性,被广泛用于飞机制造。然而,长期暴露在湿热环境中会损害复合材料连接结构的机械完整性。本文设计了加速老化实验来测试 CFRP 在湿热老化后的机械性能,并提出了一个专为湿热耦合环境定制的新型机械性能预测模型。该模型准确预测了水热老化后 CFRP 的模量和强度。通过应用子程序和场叠加,建立了 CFRP 过盈铆接结构的三维有限元模型,考虑了湿度、温度和力的三耦合状态。加速老化试验证实了该有限元模型的精确性。通过将有限元分析与实验方法相结合,本研究深入探讨了湿热条件下 CFRP 及其接头的失效模式和机理。研究发现,湿热环境破坏了纤维与基体之间的结合,导致 CFRP 出现明显的层间分层和剪切破坏。失效形式从老化程度较低的 "片状 "逐渐转变为老化程度较高的 "丝状"。对于 CFRP 铆接结构而言,湿热条件会影响其承载能力,并改变主要失效位置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling study on the mechanical performance of CFRP/Al single-lap rivet joints under hygrothermal environmental conditions
Carbon Fiber Reinforced Polymers (CFRP) and aluminum alloys, owing to their exceptional mechanical properties and lightweight attributes, are extensively used in aircraft manufacturing. However, prolonged exposure to a hygrothermal environment can compromise the mechanical integrity of composite joint structures. In this paper, accelerated aging experiments were designed to test the mechanical properties of CFRP after hygrothermal aging, a novel mechanical property prediction model tailored for the hygrothermal coupled environment is presented. The model accurately predicts the modulus and strength of CFRP after hydrothermal aging. A three-dimensional finite element model for the CFRP interference riveted structure, considering a tri-coupled state of moisture, temperature, and force was established by the application of subroutine and field superposition. The precision of this finite element model has been affirmed through accelerated aging tests. By integrating finite element analysis with experimental methods, this research delves into the failure modes and mechanisms of CFRP and its joints under hygrothermal conditions. It was discerned that the hygrothermal environment undermines the bond between fibers and the matrix, resulting in pronounced interlaminar delamination and shear failure in CFRP. The failure forms gradually change from “flaky” at lower levels of aging to “filamentary” at higher levels of aging. For CFRP riveted structures, the hygrothermal conditions influence their loadbearing capability and shift the primary positions of failure.
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