Movaghghar A. Development of a fatigue model for composite materials using continuum damage mechanics

Object of study: the fatigue damage accumulation process in glass fiber composite. The purpose of study: The study aims to develop an energy based model to evaluate anisotropic fatigue damage accumulation in composite materials, as well as the identification of the model parameters based on the results of experiments on the fatigue strength of samples of fiberglass composite. Methods: theoretical modeling of damage accumulation was based on the fundamental concepts of the theory of elasticity, the classical theory of composite materials and continuum damage mechanics. Theoretical and practical results: developed and implemented a method for solving an important practical and industrial engineering problem of determining fatigue strength of products from composite materials, also, the experimental patterns of parameters of the anisotropic damage changes were obtained for fiberglass composite STEF-1. Scientific novelty: the novelty of the proposed model is the introduction of tensorial damage parameters that would reflect the anisotropy of the properties of composite materials for high-cycle fatigue, and offer new invariant kinetic equations of damage evolution. The degree of implementation: results of the thesis introduced in the course of the European grant № PIRSES-GA-2012-318874 in NTU "KPI". Application: in aviation, energy, and transport industries.