Spall fracture in aluminium alloy at high strain rates

Joshi, K. D.; Rav, Amit; Sur, Amit; Kaushik, T. C.; Gupta, Satish C.

doi:10.1063/1.4947819

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…We have collected experimental measurements of the spall strength for Al and its alloys from the literature [13][14][15][16][17][18][19][20][21][22][23]. Figure 2 shows the normalized critical velocity as a function of the normalized spall strength following Eq.…”

Section: Strength (Hardness) Effectsmentioning

confidence: 99%

Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

et al. 2019

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Section: Strength (Hardness) Effectsmentioning

confidence: 99%

Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

et al. 2019

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“…The procedure of the optimization of the SRS for the VISAR mentioned here is successfully implemented and the parameters of the SRS in all shock experiment are selected on the basis of the above-mentioned results. The mechanical and physical properties of the materials have successfully been estimated from the free surface velocity history derived using the recorded fringe pattern [15,24]. This generic procedure of identifying the suitable operating range of the SRS for a VISAR interferometer could be utilized for similar setups with different optical components and photodetectors.…”

Section: Discussionmentioning

confidence: 99%

“…Schematic of the VISAR setup in our laboratory [15] is shown in figure 1. The output signals of the two PMTs are expressed as [14]:…”

Section: Visar Output and Effect Of The Srs On Output Signalmentioning

confidence: 99%

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Characterization of a signal recording system for accurate velocity estimation using a VISAR

Rav

Joshi

Singh

et al. 2018

Meas. Sci. Technol.

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The linearity of a signal recording system (SRS) in time as well as in amplitude are important for the accurate estimation of the free surface velocity history of a moving target during shock loading and unloading when measured using optical interferometers such as a velocity interferometer system for any reflector (VISAR). Signal recording being the first step in a long sequence of signal processes, the incorporation of errors due to nonlinearity, and low signal-to-noise ratio (SNR) affects the overall accuracy and precision of the estimation of velocity history. In shock experiments the small duration (a few µs) of loading/unloading, the reflectivity of moving target surface, and the properties of optical components, control the amount of input of light to the SRS of a VISAR and this in turn affects the linearity and SNR of the overall measurement. These factors make it essential to develop in situ procedures for (i) minimizing the effect of signal induced noise and (ii) determine the linear region of operation for the SRS. Here we report on a procedure for the optimization of SRS parameters such as photodetector gain, optical power, aperture etc, so as to achieve a linear region of operation with a high SNR. The linear region of operation so determined has been utilized successfully to estimate the temporal history of the free surface velocity of the moving target in shock experiments.

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“…, is shown. Here, fracture data relative to axisymmetric smooth and notched bar specimens were taken from [36] while fracture strain at the onset spall was determined using experimental data reported by Joshi, et al [39]. The value of the stress triaxiality at the onset of spall fracture was found about 4.…”

Section: Damage Parameters Identificationmentioning

confidence: 99%

modelling ductile fracture in third stress invariant sensitive materials: application to al2024-T351

Bonora

Testa

Ricci

et al. 2022

Preprint

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Triaxiality alone is not sufficient to account for the role of stress state on ductility in materials that exhibit shear effects on fracture strain. For these materials, it has been proposed that ductility also depends on the third invariant of the stress deviator. Recently, Bonora and Testa [N. Bonora, G. Testa, Plasticity damage self-consistent model incorporating stress triaxiality and shear-controlled fracture mechanisms – model formulation, Eng. Frac. Mech. 271, 108634 (2022).] derived a plasticity damage self-consistent (PDSC) model considering damage contributions due to intervoid necking, shearing, and sheeting for an arbitrary stress state. In this work, the PDSC model has been applied to Al2024-T351 considering the experimental results reported in the literature obtained on several different sample geometries and material batches. The ability of the model to predict the transition from cup-cone to slant fracture for different stress states is shown. In addition, the possibility to predict ductile fracture in the negative stress triaxiality range has been also demonstrated showing that it can occur for stress triaxiality even much less than -0.5 as long as there is a dominant shear deformation state.

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Spall fracture in aluminium alloy at high strain rates

Cited by 6 publications

References 8 publications

Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

Characterization of a signal recording system for accurate velocity estimation using a VISAR

modelling ductile fracture in third stress invariant sensitive materials: application to al2024-T351

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