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Thermo-stamping co-curing process for CFRP/steel hybrid sheets and its interface strength improvement

机译：CFRP /钢混合片的热压共固化工艺及其界面强度的提高

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摘要

The co-curing interface between CFRP and metal has a significant influence on the comprehensive mechanical properties of the composite structure. In this paper, a series of single lap specimens were fabricated by a thermostamping process with fast curing prepreg and dual phase steel DP980. The thermo-stamping co-curing experiments were conducted under different forming conditions based on a grit-blasted metal surface to study the effect of process parameters on the interface strength. In addition, two types of interface strength improvement methods were tested: cutting mechanical grooves on the metal surface and smearing different carbon nanotube or graphene coatings on the metal and prepreg surfaces. The interface strength improvement mechanism was further explained by microscopic characterization. Finally, a finite element model combining cohesive element damage and three-dimensional Hashin failure was established to predict the failure mode of the co-curing joint. The results show that the initial pressure, heating curve and laying up methods have a certain degree of influence on the interface strength, and the best interface enhancement effect could be obtained by coating a carbon nanotube/epoxy resin and a curing agent on the metal and prepreg surfaces, respectively.
机译：CFRP和金属之间的共固化界面对复合结构的综合机械性能有重要影响。本文采用快速固化的预浸料和双相钢DP980，通过热压工艺制造了一系列单圈试样。基于喷砂金属表面，在不同的成型条件下进行了热压共固化实验，以研究工艺参数对界面强度的影响。此外，还测试了两种类型的界面强度改善方法：在金属表面上切割机械沟槽，并在金属和预浸料坯表面上涂抹不同的碳纳米管或石墨烯涂层。通过显微表征进一步解释了界面强度提高的机理。最后，建立了结合内聚元损伤和三维Hashin破坏的有限元模型，以预测共固化接头的破坏模式。结果表明，初始压力，加热曲线和铺层方法对界面强度有一定程度的影响，在金属上涂覆碳纳米管/环氧树脂和固化剂可获得最佳的界面增强效果。预浸料表面。

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  • 来源
    《Composite Structures》 |2020年第6期|112108.1-112108.28|共28页
  • 作者

  • 作者单位

    Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ Shanghai Key Lab Digital Manufacture Thin Walled Shanghai 200240 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermo-stamping co-curing process; Single lap specimen; Surface treatment; Damage simulation;

    机译：热压共固化工艺;单圈试样;表面处理;损伤模拟;

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