A multiscale approach for the development of a nonlinear viscoelastic friction-and-cavitation-based model for solid propellants. (1st September 2022)

• Record Type: Journal Article
• Authors: Picquart, Marion; Poirey, Gilles
• Is Part Of: International journal of solids and structures. Volume 251(2022)
• Publication Date: 2022-09-01
• Subjects: Solid propellant -- Nonlinearities -- Viscoelasticity -- Multiscale -- Friction -- Cavitation; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2022.111749
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: Solid composite propellants present a highly nonlinear viscoelastic behavior when submitted to cyclic loadings. To model these nonlinearities, it is proposed to use two internal variables representing friction and cavitation. A homogenization approach is set to determine the evolution equations of these variables and their mathematical relationships with the material's macroscopic properties. Then, a macroscopic step allows the construction of a thermomechanically consistent viscoelastic model containing the new internal variables. Numerical parameters are identified through propellant characterization tests. Validations on cyclic experiments show the model's ability to reproduce and to predict the material's behavior correctly outside this identification range. Graphical abstract: Highlights: A new model is developed to predict the nonlinear behavior of solid propellants. A multiscale approach is used to determine internal variables and introduce them into a macroscopic viscoelastic model. The new model includes microscopic friction and cavitation. The new model nonlinearities depend on the stress states and strain level. The new model is able to predict the Mullins effect and other nonlinearities.