Experimental analysis of the causes of skin wrinkles below the radius filler of hat-stiffened skins
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摘要: 研究了碳纤维/环氧树脂复合材料帽型加筋壁板在长桁先固化、蒙皮未固化的共胶接工艺下，填充芯材下方蒙皮褶皱的形成过程及产生原因。测试了预浸料的树脂流变特性，由压力监测设备对填充芯材下方蒙皮内部压力进行监测获得了其内部压力的分布，采用金相显微镜对褶皱进行了表征。结果表明：在树脂流动的窗口期，当填充芯材下方蒙皮内部出现压力差时，树脂向低压区流动并聚集，导致褶皱产生。Abstract: The formation process and causes of the skin wrinkles under the radius filler were studied in the co-bonding process of the hat-stiffened skins of carbon fiber/epoxy resin composite with the pre-cured stiffener and uncured skin. The rheological properties of the resin of the prepreg were tested. The internal pressure distribution of the skin under the radius filler was monitored by pressure monitoring equipment, and the wrinkles were characterized by metallographic microscope. The results show that during the window period of the resin flow, the resin flows to the low-pressure area and aggregates, resulting in wrinkles when a pressure difference occurs inside the skin under the radius filler.
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Key words:
- hat-stiffened skins /
- radius filler /
- skin wrinkles /
- pressure difference /
- resin flow
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图 1 帽型加筋壁板及填充芯材局部示意图
Figure 1. Schematic diagram of hat-stiffened skins and radius filler
图 3 填充芯材下方蒙皮内部的测量点位置示意图
Figure 3. Schematic diagram of position of the measuring point inside the skin under the radius filler
图 4 填充芯材下方蒙皮褶皱的评价方法
Figure 4. Evaluation method of skin wrinkles under the radius filler
t—Thickness of skin; L—Length of wrinkles; D—Distance of wrinkles
图 5 选用预浸料的环氧树脂的流变曲线
Figure 5. Rheological curves of epoxy resin of the selected prepreg
图 6 截面积偏差δS分别为0%、20%和50%的填充芯材下方蒙皮内部的压强
Figure 6. Pressure inside the skin under the radius filler with cross-sectional deviation δS of 0%, 20% and 50%
图 8 填充芯材截面积偏差为50%实验组不同位置的金相图对比
Figure 8. Comparison of metallographic diagrams in different positions of the experimental group with the 50% radius filler cross-sectional deviation
图 9 不同位置的层间树脂相对厚度
Figure 9. Relative thickness of resin between the layers in different positions
图 10 填充芯材下方蒙皮褶皱的形成过程示意图
Figure 10. Formation process of skin wrinkles under the radius filler
表 1 填充芯材下方蒙皮内部的压强对比
Table 1. Comparison of pressure inside the skin under the radius filler
Radius filler cross-
sectional deviationAverage pressure/kPa Pressure
difference/kPa1# 2# 3# 4# 0% 688.31 684.74 670.53 672.42 17.78 20% 699.29 679.99 685.31 670.26 29.04 50% 689.08 661.97 665.19 656.17 32.91 
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表 2 蒙皮平整区和褶皱区厚度对比
Table 2. Comparison of skin thickness in flat and wrinkle positions
Radius filler cross-sectional deviation Area Skin thickness/mm Theoretical thickness/mm 0% Flat 8.04 8.22 Wrinkle 8.96 8.22 20% Flat 8.03 8.22 Wrinkle 9.16 8.22 50% Flat 8.02 8.22 Wrinkle 9.42 8.22
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