Abstract
This paper presents an improvement in the Huber–Mises–Hencky (HMH) material effort hypothesis proposed by Burzyński. Unlike the HMH hypothesis, it differentiates the plastic effort between compression and tensile load states, and links shear with tensile limit. Furthermore, it considers the fact that construction materials do not have infinite resistance in the pure tensile hydrostatic load state, which was proved by the static load experiment performed on St12T heat-resistant steel. The asymmetry between tensile and compressive loads is captured by the elastic region asymmetry coefficient , which was established by experiment for St12T steel in the temperature range between 20 °C and 800 °C.
Highlights
Demonstrating thermal stresses and strains is generally a complex and challenging task
In the case of steep and fluctuated loads containing rapid cooling–heating cycles, the thermal stresses can become much higher than yield strength inducing plastic deformation
Numerical simulations include an asymmetry parameter derived from the experiment run in several thermal conditions, which is a novel approach in such models [16,17]
Summary
Demonstrating thermal stresses and strains is generally a complex and challenging task. The following paper proposes a novel model of the phenomena, with an emphasis on viewing strength variability as a function of material load (effort) This approach was used to model the stress and deformation in turbine components, and is successfully tailored to describe the physical phenomena present in the wet combustion liner designed in the project. Numerical simulations include an asymmetry parameter derived from the experiment run in several thermal conditions, which is a novel approach in such models [16,17] This unique method is barely present in the literature and includes an additional Burzynski component based on the energy of volumetric deformation. As a result of that, ceramic materials have many potential applications in aerospace engineering, e.g., turbine blades or combustion chambers [20,21]
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