Dataset for paper: Experimental Observations and Statistical Modeling of Crack Propagation Dynamics in Limestone by Acoustic Emission Analysis During Freezing and Thawing

• Main Authors: Julian Murton, Vikram Maji
• Format: Dataset
• Language: unknown
• Published: 2021
• Subjects: Geomorphology and earth surface processes; Acoustic Emissions (AE); Freeze-thaw; Limestone; microcracking; Geomorphology and Regolith and Landscape Evolution; permafrost
• Online Access: https://doi.org/10.25377/sussex.14040029.v1; https://figshare.com/articles/dataset/Dataset_for_paper_Experimental_Observations_and_Statistical_Modeling_of_Crack_Propagation_Dynamics_in_Limestone_by_Acoustic_Emission_Analysis_During_Freezing_and_Thawing/14040029

Dataset for paper published in Advancing Earth and Space Science. July 2021 Acoustic emission data during freeze–thaw experiment on limestone in Sussex Permafrost Laboratory The dataset contains the continuous acoustic emission (AE) activity measured during the course of 16 bidirectional (bottom up and top down) freezing and thawing cycles in 300 mm cubic block of Tuffeau limestone. The physical experiment under the dynamic thermal boundary conditions aims to understand the mechanistic development of micro- to macroscale fracturing over the course of 470 days by sensing the location, timing, duration and amplitude of acoustic waves during any events of cracking. Eight R15-alpha piezoceramic transducers (PZT) (manufactured by Mistras Group) were used to detect the AE waveforms mounted on the surfaces of the limestone by silicon grease epoxy (Pro silicone grease 494-124, from RS Components). The signals were further amplified by 40 dB using Physical Acoustic Corporation (PAC) preamplifiers (IL40S with 32 to 1100 kHz). A threshold of 40 dB was set to separate noise induced in the laboratory from the signals of microcracking events. The signals were acquired by an 8-channel PCI Express-8 data card (Mistras Group) and the entire operation was controlled by AEWin software (Mistras Group). The first column in the datasheet represents the days since the beginning of the experiment, followed by 3D locations (X, Y and Z, measured in millimetres from the top left corner in the front face of the block) of the AE (i.e., microcracking) events in columns two to four. Signals from at least four out of eight transducers were considered to indicate the location of released energy (AE hit). Column five and six illustrates rise time and duration of the AE waveforms in microseconds. The number of times a signal crossing the preset threshold (i.e., count) and the maximum amplitude (in dB) were presented in column seven and eight, respectively. The dataset is analyzed and interpreted in the following draft research paper, currently in ...