基于组合芯模维形传压的复合材料帽型加筋构件固化过程压力分布及成型质量

常腾飞; 湛利华; 邓帆; 李树健

doi:10.13801/j.cnki.fhclxb.20220705.001

基于组合芯模维形传压的复合材料帽型加筋构件固化过程压力分布及成型质量

doi: 10.13801/j.cnki.fhclxb.20220705.001

1.
湖南科技大学　机电工程学院，湘潭 411201
2.
中南大学　轻合金研究院，长沙 410006

基金项目: 湖南省科技创新计划(2020 RC4001)；湖南科技大学博士科研启动资金(E52077)

详细信息

通讯作者:
湛利华，博士，教授，博士生导师，研究方向为树脂基复合材料构件成形制造　E-mail: yjs-cast@csu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2022-05-17
- 修回日期: 2022-06-17
- 录用日期: 2022-06-18
- 网络出版日期: 2022-07-06
- 刊出日期: 2023-05-15

Pressure distribution and forming quality of composite hat-stiffened structures during curing process based on combined mandrel pressurization method

1.
School of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
2.
Light Alloy Research Institute, Central South University, Changsha 410006, China

Funds: Science and Technology Innovation Program of Hunan Province (2020 RC4001); Doctoral Research Startup Fund of Hunan University of Science and Technology (E52077)

摘要

摘要: 为改善硅橡胶芯模辅助成型中调型孔工艺窗口过窄，导致复合材料帽型件成型质量对其敏感性过高问题，提出硅橡胶芯模&真空袋气囊组合新方法，并对不同调型孔硅橡胶芯模&真空袋气囊下成型的复合材料帽型件固化过程中压力分布和固化后成型精度、微观结构与力学性能进行了研究。结果表明：未开设调型孔&真空袋气囊，构件内部压力大小波动明显且不均分布，随着孔占比X_S的增大，在X_S=0.40~0.53内，构件内部压力均匀且稳定在所需压力0.6 MPa，同时，构件厚度和型腔高度平均差值仅为0.046 mm和0.40 mm，其三角区域微观结构质量较高，平均拉脱性能和增幅分别为3.42 MPa和23.02%。本文提出的方法具有更宽的调型孔工艺窗口，在复合材料帽型件固化成型领域具备一定应用潜力。
- 复合材料 /
- 帽型加筋构件 /
- 共固化 /
- 组合芯模 /
- 成型质量
Abstract: In order to improve the problem that the process window for the size of the silicone rubber mandrel was too narrow, which led to the high sensitivity of the forming quality of the composite hat-stiffened structure, a novel mandrel pressurization method combining silicon rubber mandrel and vacuum bag airbag was proposed, and the pressure distributions in the co-curing process and the forming accuracy, microstructure and mechanical properties of the composite hat-stiffened structures formed under the combined mandrel with different adjustable apertures were studied. The results show that the internal pressure fluctuates obviously and unevenly without the opening of adjustable aperture. With the increase of aperture proportion X_S, the internal pressure is uniform and stable at the required pressure of 0.6 MPa within X_S=0.40-0.53. At the same time, the average differences between the component thickness and the cavity height areonly 0.046 mm and 0.40 mm. The microstructure quality of the triangular area is high, and the average pull-off performance and increase rate are 3.42 MPa and 23.02% respectively. The method proposed in this study has a wider process window of adjustable aperture, which has a certain application potential in the forming manufacturing of composite hat-stiffened structures.
- composite /
- hat-stiffened structures /
- co-curing /
- combined mandrel /
- forming quality

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图 1 硅橡胶芯模&真空袋气囊组合模式(a)和封装实物图(b)

Figure 1. Physical drawing of combination mode and vacuum airbag (a) and packaging (b) of silicon rubber mandrel

下载: 全尺寸图片幻灯片

图 2 (a) 硅橡胶芯模外轮廓尺寸；(b) 梯形形心计算示意图

a, b, h—Long side length, short side length and height of trapezoid; C—Centre of form; R—Radius; y_C—Coordinate value

Figure 2. (a) Outer contour dimension of silicone rubber mandrel; (b) Schematic diagram of the trapezoidal centroid

下载: 全尺寸图片幻灯片

图 3 不同调型孔的梯形孔芯模

X_S—Hole proportion

Figure 3. Trapezoidal hole mandrel with different adjustable apertures

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图 4 复合材料帽型加筋构件几何尺寸

Figure 4. Geometric dimension of composite hat-stiffened structure specimen

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图 5 复合材料帽型加筋构件共固化工艺流程

Figure 5. Co-curing process flow of composite hat-stiffened structure

下载: 全尺寸图片幻灯片

图 6 毛细管压力测试系统示意图：(a) 基本原理；(b) 系统组成；(c) 构件封装

Figure 6. Schematic diagram of capillary pressure test system: (a) Basic principles; (b) Physical system; (c) Packaging to the autoclave

下载: 全尺寸图片幻灯片

图 7 复合材料帽型加筋构件拉脱破坏试验：(a) 构件夹持；(b) 界面开裂；(c)破坏过程示意图

Figure 7. Pull off failure test of composite hat-stiffened structure: (a) Component clamping; (b) Interface cracking; (c) Failure process diagram

下载: 全尺寸图片幻灯片

图 8 不同孔占比X_S条件下复合材料帽型加筋构件各监测点的压力分布曲线

Figure 8. Pressure variation curves at each monitoring position with different hole proportion X_S values of composite hat-stiffened structure

下载: 全尺寸图片幻灯片

图 9 不同孔占比X_S条件下复合材料帽型加筋构件各测试位置厚度(a)和厚度超差(b)

Figure 9. Thickness (a) and thickness out of tolerance (b) at each testing position with different hole proportion X_S of composite hat-stiffened structure

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图 10 不同孔占比X_S条件下复合材料帽型加筋构件型腔高度(a)和高度超差(b)

Figure 10. Cavity height (a) and height out of tolerance (b) under different hole proportion X_Sof composite hat-stiffened structure

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图 11 不同孔占比X_S条件下复合材料帽型加筋构件三角区微观结构

Figure 11. Microstructure of triangular region under different hole proportion X_S of composite hat-stiffened structure

下载: 全尺寸图片幻灯片

图 12 不同孔占比X_S条件下复合材料帽型加筋构件拉脱性能

Figure 12. Pull off performance of composite hat-stiffened structure under different hole proportion X_S

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图 13 不同孔占比X_S条件下复合材料帽型加筋构件拉脱破坏SEM图像

Figure 13. Pull off failure morphologies by SEM with different hole proportion X_S of composite hat-stiffened structure

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表 1 复合材料帽型加筋构件各监测点稳定阶段的压力分布

Table 1. Corresponding pressure in stable stage of the monitoring positions of composite hat-stiffened structure

X_S	Monitoring positions pressure/MPa
X_S	Hat top	Hat side	Hat bottom	Lying side	Triangle area	Pressure difference (Max)
0.00	0.681	0.665	0.669	0.671	0.573	0.108
0.34	0.631	0.615	0.630	0.577	0.610	0.054
0.40	0.614	0.610	0.602	0.595	0.612	0.019
0.48	0.591	0.586	0.594	0.588	0.592	0.008
0.53	0.578	0.582	0.576	0.575	0.583	0.008
0.60	0.556	0.558	0.550	0.548	0.553	0.010

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