| 单向碳纤维/环氧树脂预浸料叠层的面内变形行为 |
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| 引用本文： | 陈萍,赵月青,陈菲,张博明.单向碳纤维/环氧树脂预浸料叠层的面内变形行为[J].复合材料学报,2020,37(5):1049-1055. |
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| 作者姓名： | 陈萍 赵月青 陈菲 张博明 |
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| 作者单位： | 1.北京航空航天大学 材料科学与工程学院，北京 100191 |
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| 基金项目： | 国家重点研发计划（2017YFB0703300） |
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| 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。
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| 关 键 词： | 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 |
| 收稿时间： | 2019-05-30 |
In-plane deformation behavior of unidirectional carbon fiber/epoxy prepreg layups |
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| CHEN Ping,ZHAO Yueqing,CHEN Fei,ZHANG Boming.In-plane deformation behavior of unidirectional carbon fiber/epoxy prepreg layups[J].Acta Materiae Compositae Sinica,2020,37(5):1049-1055. |
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| Authors: | CHEN Ping ZHAO Yueqing CHEN Fei ZHANG Boming |
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| Affiliation: | 1.School of Materials Science and Engineering, Beihang University, Beijing 100191, China2.Composite Center, Shanghai Aircraft Manufacturing Corporation Ltd., Shanghai 200346, China |
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| 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. |
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| Keywords: | bias extension method unidirectional thermoset prepreg deformation mechanism Pin-joined net(PJN)theory hot diaphragm forming |
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