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<p>Sub-surface interface delamination in carbon/epoxy composites might develop because of the low velocity impact. Such delamination possibly grows under post impact superimposed thermo-mechanical loading. The growth resistance to such delamination in carbon/epoxy composite laminates is significantly affected by the stiffness and strength of the epoxy resins used. Hence, the main aim of the present study is to investigate how the addition of carbon nanotubes (CNTs) to epoxy can possibly improve the resistance to such delamination. A 3D finite element (FE) analysis was performed on laminated composites with embedded elliptical delamination to evaluate interlaminar stresses as well as strain energy release rate (SERR) with the help of virtual crack closure integral (VCCI). Results from the present analysis indicate that although factors like shape, relative fiber orientation of adjacent laminae and size influence delamination growth, but in all cases, mixing CNTs in epoxy resin substantially enhances delamination growth resistance. Furthermore, it has been observed that the residual stresses developed from the thermoelastic anisotropy of the laminae significantly influence both the initiation and growth of delamination.</p>

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Delamination Growth in Carbon/Epoxy Laminates Having an Embedded Elliptical Delamination Under Thermomechanical Loading–Influence of CNTs

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Chukka Atchuta Rao,
  • Durgarao Kamireddy,
  • Debabrata Chakraborty

摘要

Sub-surface interface delamination in carbon/epoxy composites might develop because of the low velocity impact. Such delamination possibly grows under post impact superimposed thermo-mechanical loading. The growth resistance to such delamination in carbon/epoxy composite laminates is significantly affected by the stiffness and strength of the epoxy resins used. Hence, the main aim of the present study is to investigate how the addition of carbon nanotubes (CNTs) to epoxy can possibly improve the resistance to such delamination. A 3D finite element (FE) analysis was performed on laminated composites with embedded elliptical delamination to evaluate interlaminar stresses as well as strain energy release rate (SERR) with the help of virtual crack closure integral (VCCI). Results from the present analysis indicate that although factors like shape, relative fiber orientation of adjacent laminae and size influence delamination growth, but in all cases, mixing CNTs in epoxy resin substantially enhances delamination growth resistance. Furthermore, it has been observed that the residual stresses developed from the thermoelastic anisotropy of the laminae significantly influence both the initiation and growth of delamination.