Scholarlink

<p>Lightweight and mechanically strong sandwich panels are extensively used in the aerospace, defence and energy sectors. In this context, the present study aims to develop high-strength lightweight multifunctional composites using epoxy and reticulated vitreous carbon (RVC) foam. For this, epoxy-infiltrated RVC foams were prepared by the scalable vacuum-assisted resin transfer moulding (VARTM) technique. The complex porous structure of RVC foam, owing to its local variations in the density as well as open-cell content, entails variations in the compressive strength of the composite, making it a function of density and porosity. To rationalize the statistical variations in composites, the Weibull distribution was used to predict compressive properties, measured on a large number of specimens. The Weibull analysis revealed a regression coefficient of 0.98 and a characteristic strength of ~75.1 MPa. The average compressive strength and modulus of the epoxy–RVC foam composite were found to be 68.52 ± 16.03 and 1303.7 ± 141.63 MPa, respectively. Moreover, the flexural strength and modulus of these composites were found to be 33.6 ± 6.6 and 4.73 ± 2.6 GPa, respectively. In addition, the composites showed electromagnetic interference shielding effectiveness of &gt;20 dB with absorption domination in X-band frequency. On account of its lightweight, promising microwave absorption and mechanical properties, epoxy–RVC foam composites are potential candidates as multifunctional core materials in sandwich panels.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Lightweight microwave-absorbing epoxy–reticulated vitreous carbon foam composites manufactured by vacuum-assisted resin transfer moulding for structural application

  • 期刊论文

  • 发表日期：

    2025年7月16日

查看全文
  • Nishant Gaikwad,
  • Rajkumar Wagmare,
  • T Umasankar Patro

摘要

Lightweight and mechanically strong sandwich panels are extensively used in the aerospace, defence and energy sectors. In this context, the present study aims to develop high-strength lightweight multifunctional composites using epoxy and reticulated vitreous carbon (RVC) foam. For this, epoxy-infiltrated RVC foams were prepared by the scalable vacuum-assisted resin transfer moulding (VARTM) technique. The complex porous structure of RVC foam, owing to its local variations in the density as well as open-cell content, entails variations in the compressive strength of the composite, making it a function of density and porosity. To rationalize the statistical variations in composites, the Weibull distribution was used to predict compressive properties, measured on a large number of specimens. The Weibull analysis revealed a regression coefficient of 0.98 and a characteristic strength of ~75.1 MPa. The average compressive strength and modulus of the epoxy–RVC foam composite were found to be 68.52 ± 16.03 and 1303.7 ± 141.63 MPa, respectively. Moreover, the flexural strength and modulus of these composites were found to be 33.6 ± 6.6 and 4.73 ± 2.6 GPa, respectively. In addition, the composites showed electromagnetic interference shielding effectiveness of >20 dB with absorption domination in X-band frequency. On account of its lightweight, promising microwave absorption and mechanical properties, epoxy–RVC foam composites are potential candidates as multifunctional core materials in sandwich panels.