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In-situ characterization of the local mechanical behaviour of polymer matrix in 3D carbon fiber composites by cyclic indentation test

机译：循环压痕试验的3D碳纤维复合材料中聚合物基质局部力学行为的原位表征

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摘要

In this work, a cyclic indentation test is employed for the in-situ characterisation of the local mechanical properties of a PR520 epoxy resin matrix in a 3D carbon fiber composite. Since the evolution of indentation response with time is studied, the cyclic loading allows to characterise both the elastic and the time dependent, viscoelastic, mechanical response of the material simultaneously. The 3D carbon fiber composite used in this study contains a number of large resin pockets between fiber bundles (mesoscopic scale) with a characteristic dimension ranging from several hundred of micrometers to several millimeters. The mechanical behaviour of the polymer matrix is investigated on the external surface and in volume of the composite and compared with the neat polymer. The instantaneous elastic modulus from reloading, the energy ratio and the residual depth are determined from the cyclic material response and compared through a Student t-test based statistical analysis. Results show that there is at least 95% of probability that the neat and in-situ polymer matrix material belong to different populations. However, this difference is rather small (between 1 and 2.5%) and almost constant with cycles. Moreover, a difference between composite core and surface was measured.
机译：在这项工作中，用于在3D碳纤维复合材料中出于原位表征PR520环氧树脂基质的局部力学性质的原位表征。由于研究了压痕响应的进化，因此循环负载允许同时表征弹性和时间依赖性，粘弹性，机械响应的同时。本研究中使用的3D碳纤维复合材料含有多个纤维束（介观标）之间的大型树脂袋，其特征尺寸范围为几百微米至几毫米。在外表面上和复合材料的体积上研究了聚合物基质的力学行为，并与整齐的聚合物进行比较。从重新加载，能量比和残余深度的瞬时弹性模量由循环材料响应确定，并通过基于学生T-Test的统计分析比较。结果表明，整洁的原位聚合物基质材料属于不同群体的概率至少有95％。然而，这种差异相当小（1到2.5％），几乎恒定的循环。此外，测量复合芯和表面之间的差异。

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  • 来源
    《Composite Structures》 |2020年第7期|112268.1-112268.7|共7页
  • 作者

    Pecora Marina; Smerdova Olga; Gigliotti Marco;

  • 作者单位

    Univ Poitiers Inst Pprime Dept Phys & Mech Mat CNRS ISAE ENSMA 1 Ave Clement Ader F-86962 Futuroscope France;

    Univ Poitiers Inst Pprime Dept Phys & Mech Mat CNRS ISAE ENSMA 1 Ave Clement Ader F-86962 Futuroscope France;

    Univ Poitiers Inst Pprime Dept Phys & Mech Mat CNRS ISAE ENSMA 1 Ave Clement Ader F-86962 Futuroscope France;

  • 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

    Instrumented indentation; Polymers; Polymer-matrix composites;

    机译：仪表压痕;聚合物;聚合物 - 基质复合材料;

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