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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.
Abstract : The basic objective of this research program is to characterize the development of material fatigue by means of stress-strain hysteresis and acoustic emission measurements. We have conjectured that the accumulation and organization of damage in material fatigue is similar to the progressive failure of structures under cyclic loading. And, specifically, that the endurance limit of a material in fatigue is the analogue of the incremental collapse load of a structure. Since the principal features of the service life and failure of structures can be completely described by hysteresis methods, it is plausible that similar means can be used to characterize the inception and organization of microplastic processes in materials. All of the experimental results obtained during the current research program confirm these conjectures.
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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.
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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.
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This materials science paper proposes an energy-based fatigue failure criterion using microplastic strain hysteresis energy, developing a relation between stress amplitude and cycles to failure. 'Microplastic strain' refers to small-scale plastic deformation in metals during cyclic loading and has no connection to environmental plastic pollution.
Microplastic Limit of Steel Determined by the Measurement of Changes in Electrical Impedance
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This study determines the microplastic limit of steel by measuring changes in electrical impedance, finding that it falls below the fatigue limit and separates non-damaging from damaging cyclic stresses.
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