2013
DOI: 10.1111/jace.12592
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Crack Growth Monitoring in Ceramic Matrix Composites by Combined Infrared Thermography and Acoustic Emission

Abstract: The current study proposes a novel methodology for measuring crack growth in composite materials using combined infrared thermography (IRT) and acoustic emission (AE). The technique is tested across a SiC‐fiber‐reinforced ceramic matrix composite while no apparent factor is limiting its usage on composite materials of different nature as well. Compact tension specimens were loaded in tension with unloading/reloading loops and the thermally dissipated energy due to crack growth and other damage mechanisms was c… Show more

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Cited by 33 publications
(12 citation statements)
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“…The experimental process is as follows: (1) Prepare ceramics samples before loading; (2) Install coaxially the blocks and indenters to prevent friction signals due to relative slipping from interfering AE measurements; (3) Install the sample and ensure the indenter has a firm contact on its upper face; (4) Preset the AE threshold at 0 dB; (5) Preload and make sure all four channel receive AE signals; (6) Set the AE threshold at 45 dB before the formal loading; (7) Load and set the loading rate at 0.5 kN/s; (8) Measure and record AE information as the waveform, event counts, ringdown counts, energy, and so on; (9) Record loading information in real time by the force-displacement control system and observe the dynamic change of the sample; (10) Stop AE signal acquisition after sample failure; (11) Examine the heel blocks and indenters and change to the next sample. Experimental results show that most samples were split in their centers, whereas the heel blocks and indenters stayed intact.…”
Section: Methodsmentioning
confidence: 99%
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“…The experimental process is as follows: (1) Prepare ceramics samples before loading; (2) Install coaxially the blocks and indenters to prevent friction signals due to relative slipping from interfering AE measurements; (3) Install the sample and ensure the indenter has a firm contact on its upper face; (4) Preset the AE threshold at 0 dB; (5) Preload and make sure all four channel receive AE signals; (6) Set the AE threshold at 45 dB before the formal loading; (7) Load and set the loading rate at 0.5 kN/s; (8) Measure and record AE information as the waveform, event counts, ringdown counts, energy, and so on; (9) Record loading information in real time by the force-displacement control system and observe the dynamic change of the sample; (10) Stop AE signal acquisition after sample failure; (11) Examine the heel blocks and indenters and change to the next sample. Experimental results show that most samples were split in their centers, whereas the heel blocks and indenters stayed intact.…”
Section: Methodsmentioning
confidence: 99%
“…[3][4][5][6][7] However, most studies focus on the parameter analysis method in the field of ceramics fracture. [8][9][10][11][12][13][14] Although this method is very useful for studying the amount of crack extension and the degree of material damage, it is of little use for locating cracks and determining their scale.…”
mentioning
confidence: 99%
“…During the cyclic loading, the composite modulus decreases, and the width of stress‐strain hysteresis loop and the residual strain increase. The experimental observation and measurement provide a basis for the investigation of fatigue damage mechanism of fiber‐reinforced CMCs, including, ultrasonic, acoustic emission, scanning electron microscope, surface temperature, electrical resistivity, and the hysteresis measurements . The fatigue hysteresis loops area, that is, the hysteresis dissipated energy, can be used to analyze the internal damage evolution in fiber‐reinforced CMCs under cyclic fatigue loading .…”
Section: Introductionmentioning
confidence: 99%
“…Using this approach, damage evolution processes such as crack initiation and growth (Bale et al, 2013;Dassios et al, 2014), or other failure mechanisms (Zhu et al, 2012), can be monitored as they occur. In previous work, the sequence of damage cracking mechanisms in composites was investigated using X-rays (Nouri et al, 2013).…”
Section: Introductionmentioning
confidence: 99%