Investigation of the bending response of carbon nanotubes reinforced laminated tapered spherical composite panels with the influence of waviness, interphase and agglomeration

Numerical and experimental investigation of first ply failure response of multi-walled carbon nanotubes/epoxy/glass fiber hybrid laminated tapered curved composite panels

“…The nodal displacement field, d, anywhere within the element can be expressed in terms of shape function and nodal displacement vectors, which is presented as followswhere N i is the shape function of the element related to the node “ i ”, as presented in Ref. 19. The nodal degrees of freedom associated with the node “ i ” can be written as…”

“…However, there are few research articles describing the FPF behavior of CNT reinforced laminated structures. The following literature review mentions some selected works to brief readers on the structural analysis and recent development of CNT-reinforced laminated composite structures in general in the papers presented by Kassa et al 19 Yousefi et al 20 and Bacciocchi. 21 Kassa et al 19 performed a bending analysis of CNT/polymer/fiber laminated tapered spherical shells and demonstrated the influence of adding CNTs on deflection characteristics.…”

“…The following literature review mentions some selected works to brief readers on the structural analysis and recent development of CNT-reinforced laminated composite structures in general in the papers presented by Kassa et al 19 Yousefi et al 20 and Bacciocchi. 21 Kassa et al 19 performed a bending analysis of CNT/polymer/fiber laminated tapered spherical shells and demonstrated the influence of adding CNTs on deflection characteristics. Yousefi et al 20 investigated the free vibration response of CNT/polymer/fiber laminated truncated conical structures and highlighted the best values of weight fractions of CNTs to achieve the maximum value of the fundamental frequency of the panel along with minimum cost using optimization technique.…”

Development of a Formability Prediction Model for Aluminium Sandwich Panels with Polymer Core

“…However, different regions of a complex-shaped component may withstand various punch radii and strain ratios, which may even vary during forming. Therefore, it is necessary to combine the developed model and a finite element method to predict the evolutionary formability of each element when forming complex-shaped sandwich panels [ 24,25]. In addition, the developed model has the potential capability of predicting the formability of sandwich panels made from other composite materials with multiple layers by using the proposed compatibility relationship of the failure criteria between polymers and metals.…”

“…Among them, sandwich panels made from aluminium alloys and polyvinylidene difluoride (PVDF) have found particular applications on lightweight sealing and insulating components due to PVDF's strong chemical resistance, oxidation resistance and shock resistance. Moreover, the range of applications increased by the inclusion of multiwalled carbon nanotubes (MWCNT) reinforced honeycomb structures to enhance the damping effect [24,25]. At present, a great challenge on the application of the sandwich panels is that the core polymer layer is found to fail earlier than the skin metal layer due to its low resistance to normal pressure.…”