Modeling Fatigue Damage Accumulation in Power Engine Structures

Abstract

Abstracts The article describes the development of a new design technology for power engine structures (PES) hulls of increased reliability, based on the methods of system analysis using computer modeling of damage accumulation in structural elements, as well as the development of technical solutions for creating the PES hull design using new heat-resistant composite carbon-carbon and carbon-ceramic materials. To calculate the accumulation of damage, the chemical criteria of durable strength is used, for numerical calculation of the stress-strain state of structures taking into account creep, an iterative method for solving a three-dimensional problem of thermomechanics using the finite element method is applied. An example of the calculation of a high-pressure structural element, performed in the work, showed the possibility of practical implementation of the proposed technique and its effectiveness, in terms of reducing or replacing experimental studies to substantiate the reliability of structures.

Modeling of aeroelastic composite plates vibrations based on asymptotic theory

“…Due to the fact that problems ( 8)-( 10) are one-dimensional with respect to the local variable , their solution can be found analytically. The solution of the equilibrium equations with boundary conditions in the local problem (8) has the form…”

“…A feature of this approach is that the general and three-dimensional equations of the theory of elasticity are chosen as the initial ones in this method, and the aerodynamic forces are calculated on the basis of the piston theory, but also in relation to the general three-dimensional theory of elasticity. The method of asymptotic expansions in terms of a small geometric parameter has shown itself well in other problems [7][8][9][10][11][12][13]. In the present work, this method is applied for the first time to problems of aeroelasticity.…”