单向碳纤维/环氧树脂预浸料叠层的面内变形行为

陈萍; 赵月青; 陈菲; 张博明

doi:10.13801/j.cnki.fhclxb.20190730.006

单向碳纤维/环氧树脂预浸料叠层的面内变形行为

doi: 10.13801/j.cnki.fhclxb.20190730.006

陈萍^{1, 2},
赵月青¹,
陈菲²,
张博明^1, ,

1.
北京航空航天大学　材料科学与工程学院，北京 100191
2.
上海飞机制造有限公司　复合材料中心，上海 200346

基金项目: 国家重点研发计划（2017YFB0703300）

详细信息

通讯作者:
张博明，博士，教授，博士生导师，研究方向为树脂基复合材料　E-mail：zbm_666@qq.com

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2019-05-30
- 录用日期: 2019-07-13
- 网络出版日期: 2019-07-31
- 刊出日期: 2020-05-15

In-plane deformation behavior of unidirectional carbon fiber/epoxy prepreg layups

CHEN Ping^{1, 2},
ZHAO Yueqing¹,
CHEN Fei²,
ZHANG Boming^{1
, ,}

1.
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2.
Composite Center, Shanghai Aircraft Manufacturing Corporation Ltd., Shanghai 200346, China

摘要

摘要: 为了充分了解热隔膜成型过程中预浸料的变形行为，通过偏轴拉伸测试探索了热固性单向碳纤维/环氧树脂预浸料在高温条件下的面内变形机制。研究参数包括试验温度、拉伸速率、预热时间和铺层顺序等。利用数字图像相关技术，在测试过程中监测单向碳纤维/环氧树脂预浸料的变形和纤维的旋转情况。结果表明，提高试验温度或降低拉伸速率均有利于促进单向碳纤维/环氧树脂预浸料的变形。铺层顺序对单向碳纤维/环氧树脂预浸料铺层的变形行为有很大影响，[45/–45/90]_S铺层方式比 [45/90/–45]_S铺层方式更有利于纤维旋转，且[45/–45/90]_S铺层方式变形阻力更小。采用铰链连接网(Pin-joined net, PJN) 理论对单向碳纤维/环氧树脂预浸料铺层变形过程中纤维角度变化进行预测并与实验结果进行对比，结果表明，用PJN理论预测的纤维旋转角度值与测试值存在较大偏差，说明其并不适用于预测热固性单向碳纤维/环氧树脂预浸料变形过程中纤维角的变化。同时，80℃预加热可以提高单向碳纤维/环氧树脂预浸料的变形阻力。
- 偏轴拉伸 /
- 热固性预浸料 /
- 变形机制 /
- 铰链连接网(PJN)理论 /
- 热隔膜成型
Abstract: In order to fully understand the deformation behavior of prepreg in the process of hot diaphragm forming, the in-plane deformation mechanism of unidirectional carbon fiber/epoxy thermoset prepreg at high temperature was studied using the bias extension method. The effects of testing temperature, tensile rate, preheating time and stacking sequence on the in-plane deformation were investigated. Using digital image correlation technology, the specimen deformation and fiber rotation were captured during testing process. The results show that increasing temperature or decreasing tensile rate can promote the deformation of unidirectional carbon fiber/epoxy thermoset prepreg. Stacking sequence has a great influence on the deformation behavior of the unidirectional carbon fiber/epoxy thermoset prepreg stacks. The fiber rotation of [45/–45/90]_S layup is easier than that of [45/90/–45]_S layup, and the former has lower deformation resistance. The Pin-joined net (PJN) theory was used to predict the fiber rotation angle during the deformation process of the unidirectional carbon fiber/epoxy thermoset prepreg stacks, and the prediction value was compared with the experiment value. The results show that the prediction values deviate greatly from the experiment values, indicating that the PJN theory is not suitable for the prediction of the fiber rotation angle during the deformation of unidirectional carbon fiber/epoxy thermoset prepreg. Being preheated at 80℃ can increase the deformation resistance of the prepreg.
- bias extension method /
- unidirectional thermoset prepreg /
- deformation mechanism /
- Pin-joined net(PJN) theory /
- hot diaphragm forming

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图 1 未变形和变形后偏轴拉伸测试试样

Figure 1. Schematics of undeformed and deformed shapes of specimens in bias-extension test (θ₀—Initial fiber angle; θ—Instantaneous fiber angle during deformation; W₀—Initial sample width; L₀—Initial sample length； L—Instantaneous sample length during deformation; L_c—Side length of square in zone C)

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图 2 偏轴拉伸夹具

Figure 2. Set-up for bias extension tests

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图 3 不同温度下单向碳纤维/环氧预浸料叠层的力-位移曲线(5 mm/min)

Figure 3. Load-displacement curves of unidirectional carbon fiber/epoxy prepreg layups at different temperatures (5 mm/min)

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图 4 单向碳纤维/环氧预浸料提取的树脂黏度-温度曲线

Figure 4. Viscosity-temperature curve of resin extracted from unidirectional carbon fiber/epoxy prepreg

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图 5 不同温度条件下测试结束后单向碳纤维/环氧预浸料叠层的表面形貌

Figure 5. Surface appearance of unidirectional carbon fiber/epoxy prepreg layups after tests at different temperatures

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图 6 不同拉伸速率下单向碳纤维/环氧预浸料叠层的力-位移曲线(80℃)

Figure 6. Load-displacement curves of unidirectional carbon fiber/epoxy prepreg layups at different crosshead rates(80℃)

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图 7 不同拉伸速率下单向碳纤维/环氧预浸料叠层的表面形貌(80℃)

Figure 7. Surface appearance of unidirectional carbon fiber/epoxy prepreg layups after tests at different crosshead rates(80℃)

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图 8 不同铺层顺序单向碳纤维/环氧预浸料叠层的力-位移曲线(80℃, 5 mm/min)

Figure 8. Load-displacement curves of unidirectional carbon fiber/epoxy prepreg layups with different stacking sequences (80℃, 5 mm/min)

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图 9 测试结束后单向碳纤维/环氧预浸料叠层的表面形貌

Figure 9. Surface appearance of unidirectional carbon fiber/epoxy prepreg layups after tests ((a) [45/90/−45]_S; (b) [45/−45/90]_S)

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图 10 单向碳纤维/环氧预浸料叠层的纤维旋转角度实验测试值与铰链连接网(PJN)理论预测值对比(80℃)

Figure 10. Comparisons between experimental values and Pin-joined net (PJN) theoretical predictions of fiber rotation angle of unidirectional carbon fiber/epoxy prepreg layups (80℃)

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图 11 单向碳纤维/环氧预浸料经80℃处理不同时间后的固化度

Figure 11. Curing degree of unidirectional carbon fiber/epoxy prepreg treated at 80℃ for different times

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图 12 80℃ 预加热不同时间单向碳纤维/环氧预浸料叠层的力-位移曲线

Figure 12. Load-displacement curves of unidirectional carbon fiber/epoxy prepreg layups with different preheating times at 80℃

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