Acoustic Emission Analysis of Aluminum Specimen Subjected to Laser Annealing

Barile, Claudia; Casavola, Caterina; Pappalettera, Giovanni; Pappalettere, Carmine

doi:10.1007/978-3-319-00876-9_38

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…This predictive capability is more evident if the extrusion temperature is higher; samples in group C display the greatest increase in slope, providing confirmation of higher acoustic activity compared to the other groups. This advantage has also been noted for several other materials [ 27 , 28 , 29 , 30 , 31 , 32 , 33 ], and is very important for FDM parts, given that, in most cases, delamination occurs internally and is not visible.…”

Section: Resultsmentioning

confidence: 60%

“…Taking advantage of statistical methods, these indicators can be analyzed and combined to provide information about the material’s behavior [ 22 , 23 , 24 , 25 , 26 ]. This method was successfully applied to metallic materials [ 27 , 28 , 29 ], and glass fiber reinforced polymer (GFRP) [ 30 , 31 ]. Only a few results are available in the literature for carbon fiber reinforced polymer (CFRP) and FDM parts.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Emissions in 3D Printed Parts under Mode I Delamination Test

2018

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This paper applies an innovative approach based on the acoustic emission technique to monitor the delamination process of 3D parts. Fused deposition modelling (FDM) is currently one of the most widespread techniques for additive manufacturing of a solid object from a computer model. Fundamentally, this process is based on a layer-by-layer deposition of a fused filament. The FDM technique has evolved to the point where it can now be proposed, not only as a prototyping technique, but also as one applicable to direct manufacturing. Nonetheless, a deeper comprehension of mechanical behavior and its dependence on process parameters must include the determination of material properties as a function of the service load. In this work, the effects of extrusion temperature on inter-layer cohesion are studied using a method employing a double cantilever beam (DCB). The ASTM D5528 standard was used to determine the delamination energy, GI. In addition, the acoustic emission technique was employed to follow the delamination process during testing. Finally, a Charge-Coupled Device (CCD) camera and a calibrated grid was employed to evaluate crack propagation during testing.

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Section: Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Acoustic Emissions in 3D Printed Parts under Mode I Delamination Test

2018

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“…Optical interferometric techniques are widely used for residual stress analyses in conjunction with semi-destructive techniques such as the sectioning, hole drilling, and contour methods. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In these methods, the material around a residually stressed area is removed step by step.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on Thermal Deformation Behavior

et al. 2019

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This paper discusses a non-destructive measurement technique of residual stress through optical visualization. The least amount of deformation possible is applied to steel plates by heating the specimens +10 °C from room temperature for initial calibration, and the thermal expansion behavior is visualized with an electronic speckle pattern interferometer sensitive to two dimensional in-plane displacement. Displacement distribution with the thermal deformation and coefficient of thermal expansion are obtained through interferometric fringe analysis. The results suggest the change in the thermal deformation behavior is affected by the external stress initially applied to the steel specimen. Additionally, dissimilar joints of steel and cemented carbide plates are prepared by butt-brazing. The residual stress is estimated based on the stress dependence of thermal expansion coefficient.

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“…The method is typically considered qualitative in terms of damage size and severity. Aiming at the microstructure changes (grain boundary slipping, migration of dislocation, twinning, phase transformations) in the metallic materials, the AE method has many successful application examples [2,5,6,7,8,9,10]. Ultrasonic testing (UT) is an active NDE method and is applied mostly as periodic assessment [11].…”

Section: Introductionmentioning

confidence: 99%

Combined Damage Index to Detect Plastic Deformation in Metals Using Acoustic Emission and Nonlinear Ultrasonics

Zhang

Oskoe

et al. 2018

Materials

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Understanding the amount of degradation using nondestructive evaluation (NDE) methods provides an effective way of determining the fitness to service and the residual life of structural components. Due to uncertainties introduced by the single NDE method, a combined damage index using multi-sensor data increases the reliability of damage assessment. In this paper, the outputs of three NDE methods including acoustic emission (AE), linear ultrasonics (LUT), and nonlinear ultrasonics (NLUT) are merged to identify the amount of plastic deformation in aluminum 1100. The sensitivities of individual and combined methods to microstructural changes are evaluated. The coupon samples are loaded up to different strain levels and then unloaded. AE data is recorded in real time and ultrasonic data is recorded from the unloaded samples. The major features combined in the damage index are cumulative AE absolute energy and nonlinear coefficient. The microstructural state is verified with microscopic analysis and hardness testing. The developed damage index can nondestructively assess the amount of plastic deformation with higher reliability.

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Acoustic Emission Analysis of Aluminum Specimen Subjected to Laser Annealing

Cited by 14 publications

References 3 publications

Acoustic Emissions in 3D Printed Parts under Mode I Delamination Test

Acoustic Emissions in 3D Printed Parts under Mode I Delamination Test

Effect of Residual Stress on Thermal Deformation Behavior

Combined Damage Index to Detect Plastic Deformation in Metals Using Acoustic Emission and Nonlinear Ultrasonics

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