Fatigue crack initiation and growth in riveted specimens: an optical and acoustic microscopic study

Connor, Zayna; Li, W.; Fine, M. E.; Achenbach, Jan Drewes

doi:10.1016/s0142-1123(97)00046-7

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…The detection of fatigue crack propagation is important to prevent any potential catastrophic failure of a structure. The detection of fatigue cracks was investigated in both active detection [13][14][15] and passive detection 8 in the past.…”

Section: Introductionmentioning

confidence: 99%

Toward identifying crack-length-related resonances in acoustic emission waveforms for structural health monitoring applications

Bhuiyan

Bao

Poddar

et al. 2017

Structural Health Monitoring

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In this study, we focus on analyzing the acoustic emission waveforms of the fatigue crack growth despite the conventional statistics-based analysis of acoustic emission. The acoustic emission monitoring technique is a well-known approach in the non-destructive evaluation/structural health monitoring research field. The growth of the fatigue crack causes the acoustic emission in the material that propagates in the structure. The acoustic emission happens not only from the crack growth but also from the interaction of the crack tips during the fatigue loading in the structure. The acoustic emission waveforms are generated from the acoustic emission events; they propagate and create local vibration modes along the crack faces (crack resonance). In-situ fatigue and acoustic emission experiments were conducted to monitor the acoustic emission waveforms from the fatigue cracks. Several test specimens were used in the fatigue experiments, and corresponding acoustic emission waveforms were captured. The acoustic emission waveforms were analyzed and distinguished into three types based on the similar nature in both time and frequency domains. Three-dimensional harmonic finite element analyses were performed to identify the local vibration modes. The local crack resonance phenomenon has been observed from the finite element simulation that could potentially give the geometric information of the crack. The laser Doppler vibrometry experiment was performed to identify the crack resonance phenomenon, and the experimental results were used to verify the simulated results.

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Section: Introductionmentioning

confidence: 99%

Toward identifying crack-length-related resonances in acoustic emission waveforms for structural health monitoring applications

Bhuiyan

Bao

Poddar

et al. 2017

Structural Health Monitoring

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“…Generally, this phenomenon leads to a high stressconcentration factor in the countersunk hole. In practice, the height of the knifeedge must be superior to the 1/5 of the plate thickness to avoid the excessive stress concentration and the crack phenomenon [14].…”

Section: Formulation Of the Optimization Problemmentioning

confidence: 99%

Optimization of the countersinking parameters based on the response surface method

Mosbah¹,

Attyaoui²,

Nasri³

2021

Int J Adv Manuf Technol

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The countersinking process is affected by many factors including the tools and the workpiece parameters. Some forming phenomena such as the knife-edge affect the quality of the countersunk hole. Up to now, many kinds of research rely mainly on the experiments which lead to poor quality and difficult control of this process. In this paper, a proposed numerical optimization of the countersinking process is developed to obtain a normalized countersunk hole. This optimisation approach is based on the response surface method (RMS), design of experiments (DOE) and the sequential quadratic programming (SQP). Finite element model is performed with an elastoplastic behaviour for simulating the process. A configuration with an imposed displacement applied to the blank holder is adopted in this study. The comparison between the results of the numerical model and the experiments showed a good agreement.

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“…Many studies have been done on the fatigue of aluminum panels with drilled holes or drilled and countersunk holes [1][2][3] and on the fatigue of riveted specimens or actual fuselages [4][5][6][7][8][9][10][11]. These studies of riveted specimens or actual fuselages have been somewhat limited because the fatigue crocks were not examined nondestructively until they reached the visible surface of the panel.…”

Section: Introductionmentioning

confidence: 99%

“…Surface damage in the form of microcracks and plastic strain markings has been observed to be a precursor to the emergence of a growing crack on the outer surface of the countersunk panel. [4,5] EXPER~NTALPROCEDURES Each lap joint specimen was assembled from two Alclad 2024-T3 aluminum alloy panels, 1.02 mm thick, using 2017-T4 aluminum alloy rivets following a Boeing specification [12]. The specimen geometry and dimensions are given in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic, Electron and Optical Microscopy Visualization of Surface and Sub-Surface Cracks

Connor

Fine

Achenbach

1998

Review of Progress in Quantitative Nondestructive Evaluation

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Fatigue crack initiation and growth in riveted specimens: an optical and acoustic microscopic study

Cited by 9 publications

References 2 publications

Toward identifying crack-length-related resonances in acoustic emission waveforms for structural health monitoring applications

Toward identifying crack-length-related resonances in acoustic emission waveforms for structural health monitoring applications

Optimization of the countersinking parameters based on the response surface method

Acoustic, Electron and Optical Microscopy Visualization of Surface and Sub-Surface Cracks

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