Experimental and Numerical Analysis of Fatigue Life of Aluminum Al 2024-T351 at Elevated Temperature

Abstract

This paper presents the prediction of the fatigue life of aluminum Al 2024-T351 at room and elevated temperatures under uniaxial loading using finite element simulation. Structural parts such as fuselage, wings, aircraft turbines and heat exchangers are required to work safely at this working condition even with decreasing fatigue strength and other properties. The monotonic tensile and cyclic tests at 100 °C and 200 °C were conducted using MTS 810 servo hydraulic equipped with MTS 653 high temperature furnace at a frequency of 10 Hz and load ratio of 0.1. There was an 8% increase in the yield strength and a 2.32 MPa difference in the ultimate strength at 100 °C. However, the yield strength had a 1.61 MPa difference and 25% decrease in the ultimate strength at 200 °C compared to the room temperature. The mechanical and micro-structural behavior at elevated temperatures caused an increase in the crack initiation and crack propagation which reduced the total fatigue life. The yield strength, ultimate strength, alternating stress, mean stress and fatigue life were taken as the input in finite element commercial software, ANSYS. Comparison of results between experimental and finite element methods showed a good agreement. Hence, the suggested method using the numerical software can be used for predicting the fatigue life at elevated temperature.

Evaluation of creep-fatigue life and strength for AA7001-T6 under constant amplitude loading

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Design of a novel creep testing machine to investigate the creep life history of austenitic steel foil at elevated temperature

“…Advances in automotive, power plants, petroleum or petrochemical, and aerospace industries have raised the demand for structural materials 1,2 . These materials need to have premier long‐term mechanical and sustained properties under elevated temperature, high pressure, and altering environmental parameters such as locations exposed to chloride and water 3–5 . Among the metal alloys, austenitic stainless steels have a spread range of applications for those types of components working in the abovementioned situations 6 .…”

“…1,2 These materials need to have premier long-term mechanical and sustained properties under elevated temperature, high pressure, and altering environmental parameters such as locations exposed to chloride and water. [3][4][5] Among the metal alloys, austenitic stainless steels have a spread range of applications for those types of components working in the abovementioned situations. 6 These types of steels with a chromium content of 10.5 wt% or greater possess desirable properties of strength, corrosion resistance, and formability at a competitive price in comparison to nickel-based and titanium alloys.…”