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Nano_composite_admat_conference

It is a conference presentation regarding multiscale modelling to find constitutive properties

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Nano_composite_admat_conference

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  1. Effect of Multiwalled Carbon Nanotubes on Mechanical and Electrical Properties of Carbon Fiber Reinforced Polymer Composites in Aircraft Structures P.K. Sahoo*, Vinod Kumar K Dr. P.K. Sahoo • Raman Research Fellow-2012-13, Univ. Stuttgart, Germany • Principal ScientistStructural Technological DivisionCSIR-National Aerospace LaboratoriesBangalore-560017, IndiaTel.: +91 80 2508 6342, 9900523444 (Mob)Email: pks@nal.res.in, sahoopradeepk1@gmail.com ADMAT 2019, Mat Def 23-25 September 2019 Courtyard by Marriott, Hyderabad, INDIA 24thSeptember 2019

  2. Acknowledgements • Director, CSIR-NAL, Bangalore • CSIR Grant (Projectno. MLP 1808) • Colleagues of Centre for Societal Mission & Special Technologies (CSMST) of CSIR-NAL working in the project • Masters students working in the Group

  3. INTRODUCTION • Carbon fibre reinforced polymer (CFRP) composites are extensively used in the aerospace industries for both civilian and military aircraft structural applications • MWCNTs (which have exceptional mechanical properties and electrical conductivity) in epoxy resins improves its mechanical properties and electrical conductivity.

  4. Motivation and Challenge

  5. LITERATURE Review

  6. LITERATURE Review

  7. PROBLEM STATEMENT • Investigating the effect of MWCNTs (nanoscale materials) addition in conventional CFRP on mechanical and electrical conductivity properties • To carry out parametric studies of these properties with varying weight percentage (wt. %) of MWCNTs

  8. Fiber Volume fraction of T300/Araldite/MWCNT Composites with varying CNT wt%

  9. CNTs Epoxy Resin Carbon Fiber Problem Formulation MWCNT Orientation through Transformation angle ‘a’ Multi-scale Micromechanics Approach for Evaluating Effective Properties of CF/CNT/epoxy nanocomposite: Aligned MWCNT Randomly in Epoxy Resin Matrix Determination of Mechanical & Electrical Properties of CNT/Epoxy composite by Eshelby Mori-Tanka’s Model Determination of Mechanical & Electrical Properties of CF/CNT/Epoxy nanocomposite by Eshelby Mori-Tanka’s Model

  10. Problem Formulation (Contd.) Analytical (Mori-Tanaka) Method (Stiffness): The elastic stiffness tensor C∝ can be obtained by the transformation of elastic stiffness tensor CCNT and can be expressed as Where T is the transformation matrix

  11. Problem Formulation (Contd.) Analytical (Mori-Tanaka) Method for Electrical Conductivity: The electrical conductivity tensor S∝ can be obtained by a particular transformation of electrical conductivity tensor SCNT and can be expressed as Where Q is the transformation matrix

  12. Problem Formulation (Contd.) FEM Method: Periodic Boundary Conditions applied to RVE to Evaluate Stiffness Constants RVE Total number of nodes: 7377 Total number of elements: 6920 6240 linear hexahedral elements of type C3D8R 680 linear wedge elements of type C3D6 Reuss Model (SoM based RoM)

  13. RESULTS & DISCUSSION Young's Modulus E1 GPa Young's Modulus E2=E3 GPa Shear Modulus G12=G13 GPa Shear Modulus G23 GPa

  14. RESULTS & DISCUSSION (Contd.) Electrical Conductivity of Araldite /MWCNT Composites (2-phase) • Electrical conductivity = 2.00E-08 S/m • Significant improvement in electrical conductivities (About 100% increase)

  15. RESULTS & DISCUSSION (Contd.) Tensile Modulus T300/Araldite /MWCNT Nanocomposites (3-phase)

  16. RESULTS & DISCUSSION (Contd.) Poisson's Ratios of T300/Araldite /MWCNT Nanocomposites (3-phase)

  17. RESULTS & DISCUSSION (Contd.) Shear Modulus T300/Araldite /MWCNT Nanocomposites (3-phase)

  18. RESULTS & DISCUSSION (Contd.) Electrical Conductivities of T300/Araldite /MWCNT Nanocomposites (3-phase)

  19. Concluding remarks • Multiscale materials manufacturing and simulations are exciting and pose a great challenge • Influence of CNT wt% is more significant on electrical conductivities than on mechanical properties • Improvement in mechanical properties are essential for improving structural Integrity of structure • Improvement in electrical properties are essential for improving SHM capability of structure • Aspect ratio of CNTs that depend on manufacturing process has influence on both mechanical and conductivities-to be studied further

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