Detection of Crack Initiation and Propagation in Aluminum Alloy Under Tensile Loading, Comparing Signals Acquired by Acoustic Emission and Vibration Sensors

Sayar, Hassan; Azadi, Mohammad; Alizadeh, Mohsen

doi:10.1007/s10921-019-0639-9

Cited by 12 publications

(5 citation statements)

References 31 publications

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“…When the maximum tensile load is greater than 160 MPa, the crack will open in the unloading stage of compressive load. erefore, it is reasonable to put the maximum tensile load into equation (3).…”

Section: Discussionmentioning

confidence: 99%

“…e fatigue crack growth is a common and important issue in engineering application, due to the inevitable defects in materials and structures [1]; and the small defect in material and structure, which is also considered as a small crack, propagates into a large one under cyclic load and results in fracture [2,3]. A more serious problem is that some engineering structures are subjected to both tensile and compressive loads [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Methodology for Calculating Crack Opening Stress under Tension‐Compression Cyclic Load

Lin

Wei

2021

Advances in Materials Science and Engineering

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Crack closure model has been used in several applications on the prediction of fatigue crack growth life, with expression of crack opening stress often serving as milestones. A typical difficulty in calculating the crack opening stress is the phenomenon of crack closure caused by the compressive load effect. Compressive load effect, resulting in the change of residual stress status at the unloading stage and the decrease of crack opening stress, is a long-term challenge for predicting fatigue crack growth life. We propose the expression of crack opening stress to predict fatigue crack growth life based on the analysis of compact tensile specimen with elastoplastic element method. It combines the characteristics of material and load to deal with the phenomenon of crack closure and uses stress ratio and normalized maximum applied load variable to construct the expression of crack opening stress. In the study of tensile-compression fatigue crack growth experiments, the proposed expression is proved to improve, by comparative analysis, the predictive ability on the whole range of experiment data. The novel expression is accurate and simple. Consequently, it is conducive to calculate the crack opening stress under tension-compression load.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Methodology for Calculating Crack Opening Stress under Tension‐Compression Cyclic Load

Lin

Wei

2021

Advances in Materials Science and Engineering

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“…More details about the used set-up for the acoustic emission approach could be seen in the literature. [27][28][29][35][36][37] It should be noted that the sample rate was 1 MHz, compared to the displacement rate of testing as 25 to 200 mm/min. Considering the displacement amplitude of 5.5 to 7.0 mm, the largest time of one cycle in testing was about 33.6 s (according to the displacement of 25 mm/min and the displacement amplitude of 7.0 mm).…”

Section: Materials and Experimentsmentioning

confidence: 99%

Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

Azadi

Alizadeh

Farrokhabadi

2021

Polymers and Polymer Composites

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In the present article, acoustic emission signals were utilized to predict the damage in polymer matrix composites, reinforced by carbon fibers, in the low-cycle fatigue regime. Displacement-controlled fatigue tests were performed on open-hole samples, under different conditions, at various displacement amplitudes of 5.5, 6.0, 6.5 and 7.0 mm and also under various displacement rates of 25, 50, 100 and 200 mm/min. After acquiring acoustic emission signals during cycles, two characteristic parameters were used, including the energy and the cumulative energy. Obtained results implied that the energy parameter of acoustic emission signals could be used only for the macroscopic damage, occurring at more than 65% of normalized fatigue cycles under different test conditions. However, the cumulative energy could properly predict both microscopic and macroscopic defects, at least two failure types, including matrix cracking at first cycles and the fiber breakage at last cycles. Besides, scanning electron microscopy images proved initially such claims under all loading conditions.

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“…The descriptor-based approach is widely used to analyze the AE characteristics of signals [1]. In most studies concerning crack propagation in a plate, AE characterization tests are used as a tool for predicting fracture in a structure [2,3]. Despite the effectiveness of this analysis methods, the acquired signals may be modified by the type of sensors used, their placement on the specimen, the coupling between the sensor and the specimen or even the parameters of the acquisition system [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization, modelling and simulation of ae signal due to crack propagation in PMMA

Chen¹,

Godin²,

Doitrand³

et al. 2023

eJNDT

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Acoustic Emission (AE) is a non-destructive instrumentation that allows the detection of cracking, which dissipates elastic waves resulting from local crack-induced displacement jumps within the material. However, based on the AE experiments, a link between the crack fracture mechanics and the AE features is difficult to establish quantitatively, especially under quasi-static and dynamic loading conditions. Numerical simulations have proved to be very promising for this purpose. In this study, Pencil-Lead Break (PLB) tests are carried out on PMMA plate specimens with different thicknesses in order to determine the damping characteristics of PMMA and experimentally validate the AE numerical simulations. The influence of the specimen thickness, the distance between the sensor/source and the type of sensors on the measured acoustic emission are also studied.

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Detection of Crack Initiation and Propagation in Aluminum Alloy Under Tensile Loading, Comparing Signals Acquired by Acoustic Emission and Vibration Sensors

Cited by 12 publications

References 31 publications

A Novel Methodology for Calculating Crack Opening Stress under Tension‐Compression Cyclic Load

A Novel Methodology for Calculating Crack Opening Stress under Tension‐Compression Cyclic Load

Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

Experimental characterization, modelling and simulation of ae signal due to crack propagation in PMMA

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