We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Acoustic Emission and Fatigue Characteristics of Typical Bridge Steels
AI summary Read the abstract
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.
Acoustic emission monitoring was used during tensile tests of low-carbon structural steels to determine the physical characteristics of the acoustic emission phenomena. Results indicate that acoustic emissions are caused by micro-plastic deformation processes (i.e., dislocation motion). A series of axial-fatigue tests was performed on several types of structural steels, some of which had extensive service in bridges. There was no apparent relation between specimen load histories and subsequent performance in fatigue tests. Tensile tests of specimens subjected to extensive fatigue testing, at stresses below the yield strength of the material, revealed no major difference in mechanical properties or acoustic emission response due to their fatigue histories. Further tests revealed that acoustic emission testing in the frequency range of 100-300 kHz has the physical capability of detecting cracks on large structural steel members. This may prove beneficial for the comprehensive nondestructive evaluation of steel bridges.
More Papers Like This
Hysteresis and acoustic emission as non-destructive measures of the fatigue process in metals
AI summary Read the abstract
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.
Fatigue, Hysteresis and Acoustic Emission. Parts 1 and 2
AI summary Read the abstract
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.
Acoustic study of the texture characteristics of 15YuTA construction steel in fatigue failure conditions
AI summary Read the abstract
Ultrasonic pulse methods were used to study how fatigue-induced texture changes develop in construction steel, tracking crystallographic orientation and Poisson's ratio during high-cycle fatigue. The technique provides non-destructive insight into how internal microstructural changes precede fatigue failure in structural steel.
Utilizing electromagnetic properties to determine the micro-plastic limit of low-carbon steel CSN 411375
AI summary Read the abstract
This paper used electromagnetic property measurements to determine the micro-plastic fatigue limit of low-alloy steels, addressing the fact that some cyclic stresses below the conventional fatigue limit can still cause fatigue damage under spectrum loading. The method aims to better identify the true boundary between damaging and non-damaging cyclic stress amplitudes.
Acoustic Measurement of the Texture Characteristics of 15YuTA Construction Steel under Fatigue Failure
AI summary Read the abstract
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.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.