Non-Destructive characterization of hydrogen-embrittlement cracking by acoustic emission techniques

Ultrasonic Testing of Materials

“…Finally should be mentioned the PREDEF-method of Kaule [350,351]. (pulse resonance with delayed feedback), the principle of which is closely related to digital time measurement (Figs.…”

“…The pulse rate depends on the energy thresholds in a characteristic manner, from which certain conclusions about the behavior of the material, and its failure, can be drawn [350]. Another type of measurement uses the product of pulse rate and square of the amplitude to obtain information about the size of the source, and another method consists of analyzing the frequency content of the bursts.…”

A study of hot-tearing during solidification of Aluminum alloys via the acoustic emission method

“…Materials studies have included work in fracture mechanics on flawed specimens. Acoustic emission has been utilized in the detection of "pop-in" [36,37] during rising load fracture toughness tests.…”

“…Also, the amount of crack growth per cycle can be directly determined from acoustic emission data. including pressure vessels for nuclear and petroleum industries [38][39][40], rocket motor cases [37], and bridges, buildings, and wooden beams [46]. Techniques are also available to detect, during service, the degradation of structural integrity due to subcritical flaw growth.…”

Acoustic emission interpretation of ductile fracture processes

“…Up until now, acoustic emission (AE) has generally been used to follow the kinetics of macroscopic crack growth as in stress-corrosion cracking [3] hydrogen embrittlement [4] fatigue-crack propagation, or the onset of fracture instability [5]. These have not procuced a great deal of fundamental information on how the microfracture process occurs.…”