Application of spherical nanoindentation to determine the pressure of cavitation impacts from pitting tests

Carnelli, Davide; Karimi, A.; Franc, Jean-Pierre

doi:10.1557/jmr.2011.259

Cited by 32 publications

(22 citation statements)

References 39 publications

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“…Although relative comparisons of impact load spectra appear quite satisfactory, the absolute values of impact loads still remain to be confirmed. In particular, it turned out that the present measurements do not corroborate the values of impact loads derived from an analysis of pitting tests using conventional nanoindentation tests at small strain rate [14]. Further investigations are then needed to consolidate the measured values of impact loads.…”

Section: Resultscontrasting

confidence: 69%

“…On the other hand, Carnelli et al [14] estimated the impact loads from joint pitting and nanoindentation tests and found maximum values much smaller of the order of 20 N for the same experimental device as the one used here. Hattori et al [15] measured impact loads in a cavitating liquid jet test chamber (ASTM G134-95 standard) at flow velocities up to 184 m/s and obtained a maximum value of 20 N, too.…”

Section: Discussionmentioning

confidence: 75%

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Impact Load Measurements in an Erosive Cavitating Flow

Franc

Riondet

Karimi

et al. 2011

Journal of Fluids Engineering

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International audienceImpact load measurements were carried out in a high-speed cavitation loop by means of a conventional pressure sensor flush-mounted in the region of closure of the cavity where maximum damage was observed. The sensor was dynamically calibrated by the ball drop test technique. Pressure pulse amplitudes were measured at different velocities and constant cavitation number and cavity length. It was found that pressure pulse height spectra follow a simple exponential law, which depends upon two parameters interpreted as a reference peak rate and a reference load. By exploring the dependence of both parameters on flow velocity, it was possible to show that the various histograms measured at different velocities can be reduced to a unique non-dimensional one and derive scaling laws, which enable to transpose results from one velocity to another. The measured values of impact loads are compared to similar data in the literature, and the impact load spectra are discussed with respect to pitting test results available from a previous investigation. It is concluded that an uncertainty remains on the measured values of impact loads and that a special effort should be made to compare quantitatively pitting test results and impact load measurements. To evaluate the coherence of both sets of data with each other, it is suggested to introduce two-dimensional histograms of impact loads by considering the size of the impacted area in addition to the measured impact load amplitude. It is conjectured that the combination of impact load measurements and pitting test measurements should allow the determination of such two-dimensional histograms, which are an essential input for analyzing the material response and computing the progression of erosion with exposure time

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Section: Resultscontrasting

confidence: 69%

Section: Discussionmentioning

confidence: 75%

Impact Load Measurements in an Erosive Cavitating Flow

Franc

Riondet

Karimi

et al. 2011

Journal of Fluids Engineering

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“…Near zero strain, the average slope of these curves are obtained and compared with the literature values of the static modulus of elasticity in Table 2. The moduli of elasticity deduced from the slope of the stress-strain curves from the SHPB were comparable to the static values from the literature and from nano-indentor measurements conducted at EPFL [36,37].…”

Section: Materials Testedsupporting

confidence: 75%

Scaling study of cavitation pitting from cavitating jets and ultrasonic horns

Jayaprakash¹,

Choi²,

Chahine³

et al. 2012

Wear

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International audienceCavitation erosion prediction and characterization of cavitation field strength are of interest to industries suffering from cavitation erosion detrimental effects. One means to evaluate cavitation fields and materials is to examine pitting rates during the incubation period, where the test sample undergoes localized permanent deformations shaped as individual pits. In this study, samples from three metallic materials, an Aluminum alloy (Al 7075), a Nickel Aluminum Bronze (NAB) and a Duplex Stainless Steel (SS A2205) were subjected to a vast range of cavitation intensities generated by cavitating jets at different driving pressures and by an ultrasonic horn. The resulting pitted sample surfaces were examined and characterized with a non-contact 3D optical scanner and the resulting damage computer-analyzed. A statistical analysis of the pit population and its characteristics was then carried out. It was found that the various cavitation field strengths can be correlated to the measured pit distributions and that two characteristic quantities: a characteristic number of pits per unit surface area and unit time, and a characteristic pit diameter or a characteristic pit depth can be attributed to a given "cavitation intensity level". This characterization concept can be used in the future to study the cavitation intensity of the full scale and to develop methods of full scale predictions based on model scale erosion data

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“…Then, it can reasonably be expected that the loading conditions be derived from the geometry of the pit and the material properties. Such a technique has been used by [12,13]. The authors have taken advantage of the similarity between a cavitation erosion pit and a spherical nanoindentation to estimate the amplitude of the pressure pulse responsible for a cavitation pit.…”

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confidence: 99%