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8th Edition of

International Conference on Materials Science and Engineering

March 10-12, 2025 | Rome, Italy

Materials 2023

Dipak Kumar Maiti

Speaker at Materials Science and Engineering 2023 - Dipak Kumar Maiti
Indian Institute of Technology Kharagpur, India
Title : Stochastic aeroelastic response of variable stiffness laminated composite plates

Abstract:

The influence of uncertainty in material properties on free vibration and the aeroelastic response of variable stiffness composite laminated plates is investigated in this work. Free vibration analysis is conducted by a finite element model based on third-order shear deformation theory. The developed finite element model is further coupled with MSC.Nastran to carry out aeroelastic analysis of variable stiffness laminates in the subsonic regime. MSC.Nastran helps to extract the aerodynamic influence coefficient matrix at discrete values of reduced frequencies using the Doublet Lattice Method. The implementation of variable stiffness laminates in the aerospace application can be helpful to reduce the structural weight, but the alteration of mode shapes due to stiffness variation with a plane of the lamina may cause the two modes to come closer and could be the reason for aeroelastic failure. Moreover, during the complex manufacturing process of variable stiffness laminates, free from any sort of variation in the composite properties is quite impossible which may further deteriorate the structure performance, and probably enhance the chance of early failure of structures. Thus, to investigate the stochastic free vibration and the aeroelastic response of the variable stiffness laminates, the highly efficient radial basis neural network-based surrogate model is developed. The accuracy and adaptability of the developed surrogate model are checked by comparing the result with that of the Monte Carlo simulation. Stochastic analysis of natural frequencies and flutter characteristics of variable stiffness laminates are conducted through various parametric studies. Variance-based sensitivity analysis is used to calculate the contribution of individual material properties to the free vibration and aeroelastic response of variable stiffness laminates. Further, the influence of the highly sensitive properties on structural failure due to dynamic instability is estimated. This research can be leveraged to predict the probability of failure of the structure at different levels of material uncertainty present in it.

Audience take away:

  • We always support the collaborative research culture, so if anyone from the audience is having any interest in a similar domain, please reach us.
  • Faculty members can include stochastic and failure probability analysis work to enhance their research domain. These stochastic-based design approaches could provide safer and more reliable design.
  • The variable stiffness laminates used in the present work are made up of curved fiber that may provide the same strength with lesser weight compared to traditionally used straight fiber laminates.
  • The proper utilization of fiber orientation within a lamina could be helpful to adjust the mode shapes favorably and reduce the chance of aeroelastic failure. Thus, these laminates could be pretty useful for aerospace applications.

Biography:

Dr. Dipak Kumar Maiti is currently holding full professor post at Indian Institute of Technology Kharagpur since April 2014. Dr. Maiti had also served as Scientist/Engineer during 1998-2004 and worked in Prestigious National Project, Light Combat Aircraft. He did his B.E. degree in civil engineering and Master of Technology and Doctor of Philosophy in Aerospace Engineering. He has published over 100 international journal papers, over 80 national and international conference papers, over 60 project reports, handled several research projects sponsored by ARDB, ADA, DST, ISRO, etc. of worth a few crores. So far 18 research students have obtained their PhD degree under his supervision. Currently 5 research students are pursuing their doctoral research work under his supervision. He has guided as guided several M.Tech and B.Tech students for their Master’s Projects and B.Tech Projects. His primary research areas are analysis of composite structures under static and dynamic loadings employing various higher-order shear deformation theories, damage modelling of isotropic and composite materials, smart structures, aeroelasticity / aeroservoelasticity, structural health monitoring, etc.

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