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The Hysteresis and Incremental Collapse of Complex Structures: A paradigm for the Fatigue Failure of Materials
Summary
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.