Masterarbeit, 1997
95 Seiten
The primary goal of this investigation is to comprehensively examine the cumulative fatigue damage of aluminum alloy 2024-T4 under various multilevel stress programs. This research focuses on understanding the impact of stage life, loading sequences, and different life prediction methods on the fatigue behavior of the material.
Chapter One provides an introduction to the subject of aircraft fatigue, highlighting its historical significance and the challenges faced by aircraft designers in mitigating fatigue-related issues. The chapter reviews relevant literature and outlines the objectives of the current investigation.
Chapter Two delves into the complexities of multiaxial fatigue, exploring key parameters that influence fatigue behavior, including isotropy, mean stress, phase effects, and the influence of notches. The chapter also presents various theories used to predict fatigue failure under combined stress conditions, focusing on the linear damage theory, Corten-Dolan theory, and Marsh theory.
Chapter Three outlines the experimental methodology employed in the investigation. This chapter describes the material used, including its chemical composition and mechanical properties, as well as the preparation of specimens and the testing equipment. The chapter concludes with a detailed explanation of the various test series conducted.
Chapter Four presents the experimental results obtained from the different test series, detailing the loading programs, shear stress amplitudes, and the number of cycles to fracture for each specimen. The chapter organizes the results based on the five groups of tests performed.
This research focuses on the cumulative fatigue damage of 2024-T4 aluminum alloy under multiaxial loading. The key concepts include multilevel stress programs, stage life, loading sequences, life prediction methods (Palmgren-Miner, Corten-Dolan, and Marsh), and flight loading simulations. The investigation analyzes the effect of these factors on the fatigue behavior of the material, providing insights into the complexities of fatigue failure in structural components.
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