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Hysteresis and acoustic emission as non-destructive measures of the fatigue process in metals
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Magnetic hysteresis and acoustic emission were investigated as non-destructive indicators of fatigue damage accumulation in steel, based on how microplastic processes alter grain texture and dislocation structure over repeated loading cycles. The results support using these piezomagnetic and acoustic signals as early warning indicators of structural fatigue degradation.
Abstract : Piezomagnetic effects are due to interactions between the mechanical and magnetic mesostructure of materials. In particular, under repeated loading cycles, microplastic processes generate dislocations and modify the texture of grains, voids, inclusions, and other defects. These mechanical changes in turn alter the arrangement of the coextensive ferromagnetic domain structure and affect the intensity of the associated magnetic fields.
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Piezomagnetism and fatigue
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This paper describes how piezomagnetic effects - changes in a ferromagnet's magnetization under mechanical stress - can track progressive fatigue damage in mild steel. The evolution of piezomagnetic field patterns under cyclic loading parallels material degradation and can reveal the incidence of microcracks.
Fatigue, Hysteresis and Acoustic Emission. Parts 1 and 2
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This study characterized fatigue development in AISI 1018 rimmed steel using stress-strain hysteresis and acoustic emission measurements on nearly 100 specimens, investigating whether the endurance limit in fatigue is analogous to the incremental collapse load of a structure. The research demonstrated that hysteresis methods can characterize the inception and organization of microplastic processes in materials under cyclic loading.
The Hysteresis and Incremental Collapse of Complex Structures: A paradigm for the Fatigue Failure of Materials
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This materials research program used stress-strain hysteresis and acoustic emission measurements to characterize fatigue damage accumulation, proposing that microplastic processes in materials are analogous to the incremental collapse of structures under cyclic loading. The analogy suggests that the fatigue endurance limit corresponds to the incremental collapse load, providing a structural mechanics framework for fatigue prediction.
Acoustic Measurement of the Texture Characteristics of 15YuTA Construction Steel under Fatigue Failure
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Ultrasonic pulse-echo measurements were used to track changes in texture and Poisson coefficients of 15YuTA construction steel during high-cycle fatigue, monitoring how repeated loading alters the crystallographic orientation distribution of grains. The results show that texture evolution is a measurable indicator of progressive fatigue damage accumulation in structural steel.
The use of ultrasonic signals and optical method to estimate the damage of materials after fatigue loading
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This study investigates the influence of fatigue loading on ultrasonic parameters and microplastic characteristics of steels, developing a phenomenological theory connecting pre-crack damage accumulation with acoustic and microplastic parameters, and showing that combined NDT methods offer earlier damage detection.
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