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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.
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. Experiments were conducted upon nearly 100 specimens made of Rimmed AISI 1018 Unannealed Steel. This material was selected because extensive data on its performance exists in the engineering literature and because its stress - strain curve is of the gradual yielding type thus mirroring at least the monotonic stress - strain behavior of many of the kinds of metals of used in the aircraft industry.
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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.
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.
Microplastic Strain Hysteresis Energy as a Criterion for Fatigue Fracture
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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.
Acoustic Emission and Fatigue Characteristics of Typical Bridge Steels
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This study used acoustic emission monitoring during tensile tests of low-carbon structural steels to show that emissions arise from micro-plastic deformation processes such as dislocation motion. Axial fatigue tests on bridge steels found no clear relationship between load history and subsequent fatigue performance, and demonstrated that acoustic emission in the 100-300 kHz range can detect cracks in large structural members.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.