Ultimate Strength Prediction of Carbon/Epoxy Tensile Specimens from Acoustic Emission Data

Arumugam, V.; Shankar, Roshan; Sridhar, B. T. N.; Stanley, A. Joseph

doi:10.1016/s1005-0302(10)60114-4

Cited by 34 publications

(15 citation statements)

References 8 publications

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“…Figure shows that the lowest amounts of amplitude and energy are related to the matrix cracking, the moderate values to delamination, and the highest amount to fibre breakage, showing good agreement with results of other studies [32,33].…”

Section: Figure 4: Amplitude Vs Energy Of: (A) Virgin and (B) Nanomosupporting

confidence: 89%

Supervised and non-supervised AE data classification of nanomodified CFRP during DCB tests

Fallahi¹,

Nardoni²,

Heidary³

et al. 2016

FME Transaction

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Section: Figure 4: Amplitude Vs Energy Of: (A) Virgin and (B) Nanomosupporting

confidence: 89%

Supervised and non-supervised AE data classification of nanomodified CFRP during DCB tests

Fallahi¹,

Nardoni²,

Heidary³

et al. 2016

FME Transaction

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“…DBs are known to be ineffective at ensuring midsubstance failure in tests of synthetic fiber-reinforced composites; rectangles are preferred [63][64][65]. The inability of the DB shape to ensure midsubstance failure in the circumferential tests was probably in part because the grip line was unevenly loaded, with strain-shielded regions (Fig.…”

Section: Strainmentioning

confidence: 99%

Advances in Quantification of Meniscus Tensile Mechanics Including Nonlinearity, Yield, and Failure

Peloquin

Santare

Elliott

2016

Journal of Biomechanical Engineering

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The meniscus provides crucial knee function and damage to it leads to osteoarthritis of the articular cartilage. Accurate measurement of its mechanical properties is therefore important, but there is uncertainty about how the test procedure affects the results, and some key mechanical properties are reported using ad hoc criteria (modulus) or not reported at all (yield). This study quantifies the meniscus' stress-strain curve in circumferential and radial uniaxial tension. A fiber recruitment model was used to represent the toe region of the stress-strain curve, and new reproducible and objective procedures were implemented for identifying the yield point and measuring the elastic modulus. Patterns of strain heterogeneity were identified using strain field measurements. To resolve uncertainty regarding whether rupture location (i.e., midsubstance rupture versus at-grip rupture) influences the measured mechanical properties, types of rupture were classified in detail and compared. Dogbone (DB)-shaped specimens are often used to promote midsubstance rupture; to determine if this is effective, we compared DB and rectangle (R) specimens in both the radial and circumferential directions. In circumferential testing, we also compared expanded tab (ET) specimens under the hypothesis that this shape would more effectively secure the meniscus' curved fibers and thus produce a stiffer response. The fiber recruitment model produced excellent fits to the data. Full fiber recruitment occurred approximately at the yield point, strongly supporting the model's physical interpretation. The strain fields, especially shear and transverse strain, were extremely heterogeneous. The shear strain field was arranged in pronounced bands of alternating positive and negative strain in a pattern similar to the fascicle structure. The site and extent of failure showed great variation, but did not affect the measured mechanical properties. In circumferential tension, ET specimens underwent earlier and more rapid fiber recruitment, had less stretch at yield, and had greater elastic modulus and peak stress. No significant differences were observed between R and DB specimens in either circumferential or radial tension. Based on these results, ET specimens are recommended for circumferential tests and R specimens for radial tests. In addition to the data obtained, the procedural and modeling advances made in this study are a significant step forward for meniscus research and are applicable to other fibrous soft tissues.

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“…There are also some papers where the fracture mechanics is used to explain the process of composite structure degradation [9,24]. However, only a few papers are devoted to the acoustic method employed to describe failure of thin-walled composite structures [15,21,22,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…The term ''acoustic" is thus misleading, as the real frequency band starts practically at 100 kHz and can reach 1 MHz for the latest AE equipment. In the case of composite material testing, such damage phenomena as matrix cracking, delamination, fibre pull-out or cracking of individual fibres can be registered [21,24]. AE signals are recorded with an equipment composed of one or more piezoelectric sensors, connected through pre-amplifiers with an A/D card and a PC.…”

Section: Introductionmentioning

confidence: 99%

“…The system is supervised by an adequate software. In order to characterise various damage mechanisms, the following AE parameters are commonly used: the number of hits, the number of counts, the signal amplitude or energy [21,26]. Only recently, however, the capabilities of the AE technique have been broadened significantly by an introduction of signal analysis tools, such as the FFT or wavelet analysis into the offered software [20].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation of failure process in compressed channel-section GFRP laminate columns assisted with the acoustic emission method

Kubiak

Samborski

Teter

2015

Composite Structures

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Ultimate Strength Prediction of Carbon/Epoxy Tensile Specimens from Acoustic Emission Data

Cited by 34 publications

References 8 publications

Supervised and non-supervised AE data classification of nanomodified CFRP during DCB tests

Supervised and non-supervised AE data classification of nanomodified CFRP during DCB tests

Advances in Quantification of Meniscus Tensile Mechanics Including Nonlinearity, Yield, and Failure

Experimental investigation of failure process in compressed channel-section GFRP laminate columns assisted with the acoustic emission method

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