International Journal of Mechanics and Materials in Design最新文献

Materials are of prime importance for designing and manufacturing structures and components in numerous industries, including aviation, aerospace, military, automotive, machine construction, electronics, and telecommunications, among others. Throughout the industrial transformations in human history, it is evident that the materials industry had the most significant impact on scientific and technological progress. In recent years, the Fourth Industrial Revolution has altered the infrastructure and character of production in a number of global industries. Materials science has been contributing a significant and essential role in the global competitiveness of all industries, particularly those utilizing electronic domains such as semiconductors, microprocessors, and sensors for industrial and social applications. Consequently, nanoscale materials with exceptional properties have garnered the interest of numerous researchers. One of these phenomena in dielectric materials is flexoelectricity. This phenomenon was discovered in the 1950s of the previous century, but it wasn't until the early 2000s, when materials science and other disciplines flourished, that many researchers began to focus on it. In recent years, the applicability of flexoelectric materials has increased across all disciplines. In addition, as a consequence of the importance of novel electrical materials to the flexoelectric effect, the research problem for this material broadly and the analysis of the mechanical responses of flexoelectric structures are being investigated and developed at a rapid rate. This paper provides an overview of the flexoelectric phenomenon, together with potential applications and recommendations for further study. The article’s content will serve as a valuable resource for scientists interested in dielectric materials with unique electromechanical effects, which are extensively used in contemporary electronic disciplines.

This paper presents an analytical model to investigate the static behaviour of sandwich plates comprised of two isotropic face sheets and a honeycomb core. Through-thickness transverse shear stresses were considered using a unified displacement field with which various plate theories were implemented, i.e., exponential, third-order, hyperbolic, sinusoidal, fifth-order, Mindlin, and the classic plate theory. The equilibrium equations of a simply-supported sandwich panel were derived using the principle of virtual work and Navier solution was obtained under static transverse loading. After validating of the model, various mechanical and geometrical parameters were varied to characterise the behaviour of the structure under regular and auxetic response. It was found that the auxeticity of the core strongly affects the mechanical response, e.g., in controlling deflection, in-plane anisotropy, and Poisson’s ratio. Cell wall angle was found to be most critical parameter that can be used to adjust anisotropy, out-of-plane shear modulus, transverse shear stress distribution, and deflection of the panel. Also the cell aspect ratio controls the sensitivity of the core response to other geometrical variations. In terms of the higher-order theories, the deflection-dependent parameter of the unified formulation seems to have more control of maximum deflection compared to independent rotations. Auxeticity of the core showed some benefits in controlling anisotropy, deflection and providing additional out-of-plane shear rigidity. Overall, since there is not one-to-one relationship between specific values of Poisson’s ratio, anisotropy, and shear rigidity, careful design considerations must be invested to obtain a correct mechanical response.