Some industrial applications for nanocomposites under mechanical and environmental loading
Final Report Abstract
A 2D analytical stress-functions variational method was set up for the representative volume element of a graphene/SU-8/PMMA nanocomposite under axial tensile force at environmental conditions. Under simplified assumptions, satisfaction of continuity conditions for shear and peel stresses between the layers and the use of the variational principle for minimum of the strain energy of the structure, a fourth order ordinary differential equation about unknown graphene axial strain with constant coefficients has been derived. The type of the solution of this governing differential equation depends on the geometry of the structure considered and the roots of the respective algebraic characteristic equation can have real roots. All axial, peel and shear stresses in the layers are expressed and found through the solution for the graphene axial stress and its first and second derivatives. The influence of moisture, temperature (heating and cooling) as well as the axial loads is illustrated in figures and discussed. The other important result is connected with the first appearance of a possible interface delamination along the adhesive SU-8. The next nanocomposite with industrial application is a nanoclay/polyamide where the interphase layer is a combination of both composite materials. This 3 layered nanostructure is loaded by axial load. The same analytical method is used. The length of the nanoparticle is the basic parameter in the parametric analysis of stresses in the layers. The illustration of the obtained results in figures gives a clear picture on the behavior of the axial, peel and shear stresses in the layers. All figures are discussed in detail.
Publications
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Analytical and parametric analysis of interface stress behaviour in nanoclay/polymer composite. Procedia Structural Integrity, 43(2023), 77-82.
Becker, Wilfried; Kirilova, Elisaveta; Petrova, Tatyana & Ivanova, Jordanka
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Modelling of the two-dimensional stresses in a three-layered adhesively bonded tungsten disulfide/poly(methyl methacrylate) nanocomposite structure under axial load. Procedia Structural Integrity, 43(2023), 83-88.
Petrova, Tatyana; Kirilova, Elisaveta; Becker, Wilfried; Vaklieva-Bancheva, Natasha; Vladova, Rayka & Dineva-Vladikova, Petya
