Señal ultrasónica guiada de monitorización de fatiga en placa metálica

Abstract

Ultrasonic guided-wave test data taken from a fatigue test experiment over a notched aluminium plate. Data summary.-

Ultrasonic guided-wave test data:

Frequency of excitation: 300 kHz (radial mode of vibration) Shape: sinusoid of 4 cycles Amplitude: 45 Vpp Sampling frequency: 60 kHz

Fatigue test data.- Load type: Tension-Tension (using Instron 8850 servo-hydraulic fatigue testing machine) Minimum load: 1kN Maximum load: 10kN Frequency: 6Hz Number of cycles: 100 000

Specimen information.- Aluminum plate Alloy: QQA250/5 ‘O’ 2024 Dimensions: 245mm x 500mm x 1mm Central notch length: 22.5mm (centered with respect to the test sample centerline and machined using a laser cutting procedure)

Further description.- The fatigue test has been performed using a middle tension [M(T)] specimen with a centered crack and loaded in tension using a positive loading ratio. A fatigue pre-cracking procedure was applied to develop a fresh and straight crack front to mitigate the effect of the machined started notch. The detection and monitoring of the crack onset and growth was carried out using two phased-arrays of six piezoelectric wafer active sensors (PWAS), one set as transmitter, the other as receiver. Piezoelectric ceramic disc transducers of 7mm diameter and 0.5mm thickness have been used in this fatigue test. They PWAS were placed symmetrically with regards to the sample centerline and bonded to the aluminum surface using a 3M Scotch-Weld DP490 epoxy adhesive (TradeMarks).

File naming convention: “P_AL_S01_BF6.mat” or “P_AL_S01_BF6_XXX.mat” with XXX=1000, 2000, 3000, 100 000; P stands for Plate; AL stands for Aluminum; S01 stands for specimen 01; BF6 stands for Beamforming using 6 transducers; XXX are the number of cycles at which the fatigue test stopped and the ultrasonic guided-wave tests were performed (every 1000 fatigue cycle).

Note 1: The file “P_AL_S01_BF6.mat” contains the data with the structure in pristine state. Note 2: The files “P_AL_S01_BF6_XXX.mat” contains the data after XXX fatigue cycles.

Further details about the internal data structure of the MAT-files included within the Readme file within the dataset.