Mesoscale analysis of aging mechanical behaviors of 3D woven composites
Mesoscale analysis of aging mechanical behaviors of 3D woven composites
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DOI：
10.1016/j.ijmecsci.2024.109037
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发表时间：
2024-01
影响因子：
7.3
通讯作者：
Kelin Deng;Yuan Li;Haoyuan Suo;Hui Cheng;Kaifu Zhang;R. Bai;B. Liang
中科院分区：
文献类型：
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作者：
Kelin Deng;Yuan Li;Haoyuan Suo;Hui Cheng;Kaifu Zhang;R. Bai;B. Liang
三维正交编织复合材料（3DOWCs）在超声速飞机结构应用中不可避免地要经受严酷的循环湿热老化环境，其耐久性有待验证。然而，目前关于3DOWCs湿热老化的研究大多依赖于实验方法，成本较高。为了解决这一问题，本文建立了3DOWCs的基质-纱线中尺度模型，研究了其循环湿热老化力学行为。利用真实的钢筋几何形态，构建了高保真中尺度代表性体元。在中尺度模型中只需要考虑纯树脂的老化特性。采用考虑树脂老化的Chamis公式计算了纤维纱线的老化性能。在本构模型中考虑了树脂基体的拉压不对称行为。采用渐进式三维损伤模型对树脂基体、纱线和黏结界面的损伤起始和扩展过程进行了模拟。采用中尺度模型对3DOWCs时效前后的力学性能进行了预测，并进行了实验验证。该工作可为恶劣环境下的三维多轴复合材料的设计提供有效的工具。
3D orthogonal woven composites (3DOWCs) are inevitably subjected to the severe cyclic hygrothermal aging environment in the application of supersonic aircraft structures and their durability should be proven. However, most current works relating to the hygrothermal aging of 3DOWCs rely on the experimental methods which are of high cost. To address this issue, a matrix-yarn mesoscale model of 3DOWCs was established to investigate the cyclic hygrothermal aging mechanical behaviors in this paper. High-fidelity mesoscale representative volume element (RVE) was constructed with realistic geometric configuration of the reinforcement. Only the aging properties of pure resin were needed in the mesoscale model. The aging properties of fiber yarns were calculated with Chamis formulas accounting for resin aging. Tension-compression asymmetry behavior of resin matrix was accounted in the constitutive model. The damage initiation and propagation of resin matrix, yarn and cohesive interface were modeled by the progressive 3D damage model. The mechanical properties of 3DOWCs before and after aging were predicted by the mesoscale model and validated with experiment. This work can provide effective tool for the design of 3DOWCs applied in harsh environments.