Topic
Acoustic emission
About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.
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TL;DR: Based on the experimental studies of creep behavior of granite at different temperatures, a damage-mechanism-based creep model was proposed in this paper, where significant thermal effect on the time-dependent behaviour of granite is observed.
61 citations
TL;DR: In this article, the effects of the confining pressure and the loading and unloading cycles on the mechanical properties of the rock in the residual phase were analyzed and calculated, and the precursor information about the rock yielding to plastic deformation was confirmed based on the evolution characteristics of the acoustic emission amplitude.
61 citations
TL;DR: In this paper, the authors used both acoustic emission and vibration sensors attached on two points of the grinder machine to determine the end of spark out and elastic deformation phases of the wheel cycle.
61 citations
TL;DR: In this article, three widely used tensile testing methods are employed, namely the Brazilian test with simplified ISRM standard (Type I), the Brazil test with the China standard (type II), and the direct tensile test.
61 citations
TL;DR: In this paper, the authors report on experimental investigations of acoustic emission by quartz tuning forks resonating at frequencies 32, 38, 57, 77, and 100 kHz in cold gaseous 4He and its normal and superfluid liquid phases.
Abstract: We report on experimental investigations of acoustic emission by quartz tuning forks resonating at frequencies 32 kHz, 38 kHz, 77 kHz and 100 kHz immersed in cold gaseous 4He and its normal and superfluid liquid phases. Frequency dependence of the observed low-drive-linewidth at 350 mK together with the temperature and pressure dependences (1.3 K < T < 4.2 K, 0 < p < 25 bar) of the observed damping of the high frequency (77 and 100 kHz) resonators measured in normal liquid 4He and its superfluid phase provide strong and direct evidence of the importance of sound emission by these tuning forks. Three analytical models of acoustic emission by vibrating tuning forks are developed and compared with the experimental results. We also discuss the importance of sound emission for experiments with the commonly used 32 kHz tuning forks as well as other oscillating structures—spheres, wires, grids and various micromachined sensors. We compare the relative importance of dissipative losses due to laminar viscous/ballistic drag and acoustic emission in liquid and superfluid 4He.
61 citations