Analysis of Inelastic Behavior for High Temperature Materials and Structures

Abstract

This review provides a current status in modeling and analysis of structures for high-temperature applications. Basic features of inelastic behavior of heat resistant alloys are discussed. Typical responses for stationary and varying loading and temperature are presented and classified. Microstructural features and microstructural changes in the course of inelastic deformation at high temperature are discussed. The state of the art on material modeling and structural analysis in the inelastic range at high temperature is resented.Keywords Creep · Low cycle fatigue · Damage mechanics · Length scales · Temporal scales · Structural analysis IntroductionThe aim of this contribution is to give an overview of experimental and theoretical approaches to analyze the behavior of materials and structures subjected to mechanical loading and "high-temperature" environment. The definition of "hightemperature" materials and "high-temperature" structures can be related to the value of the homologous temperature, that is T /T m , where T is the absolute temperature and T m is the melting point of the considered material. Materials that can be efficiently used within the temperature range 0.3 < T /T m < 0.7 are called hightemperature materials. Examples include heat resistant steels, nickel-bases alloys, age-hardened aluminum alloys, cast iron materials and metal matrix composites. Structures that operate in the temperature range 0.3 < T /T m < 0.7 over a long period of time are called high-temperature structures. Examples include turbine

Inelastic deformation of conductive bodies in electromagnetic fields

“…For example, electrical conductivity, yield strength and other properties during the heating may vary by several times. Furthermore, inelastic flow at high temperature is accompanied by changes in microstructure, such that hardening, softening, recovery and damage processes should be taken into account within a constitutive model with internal state variables [23,[30][31][32] or by application of enhanced continuum theories with higher order gradients and phase field variables [7,28]. Therefore there is a practical need for the mathematical formulation of problems of non-isothermal elasto-plastic deformation of bodies under the influence of external electromagnetic fields, taking into account the mutual influence of fields of different nature in a wide ranges of temperature, and taking into account the nonlinearity of electromagnetic, thermal and mechanical properties of materials.…”