Three-Dimensional Characterization and Modeling of Microstructural Weak Links for Spall Damage in FCC Metals

Krishnan, Kapil; Brown, A. D.; Wayne, Leda; Vo, Johnathan; Opie, Saul; Lim, Harn Chyi; Peralta, Pedro; Luo, S. N.; Byler, Darrin D.; McClellan, Kenneth J.; Koskelo, Aaron C.; Dickerson, Robert M.

doi:10.1007/s11661-014-2667-5

Cited by 31 publications

(5 citation statements)

References 44 publications

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“…Therefore, it was relatively difficult to generate stress concentration at these block boundaries, which means the void was difficult to be nucleated at this kind of block boundaries. The experimental results were also consistent with the conclusions of Krishnan et al and Yang et al The voids nucleated preferentially at the grain boundary between the adjacent grains with strong plastic deformation capacity.…”

Section: Resultssupporting

confidence: 90%

“…For spallation, the early researches were focused on the effect of the microstructure of materials in single‐phase alloys, such as grain, grain boundary, and inclusion . For example, Furnish and Chhabildas discovered that the void nucleation position of the tantalum samples was related to the initial grain size of the samples—the samples with a grain size of 20 μm had a wider void distribution area than the samples with a grain size of 40 μm.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Phase Interface on Spallation Damage Nucleation and Evolution in Dual‐Phase Steel

Yang

Wang

et al. 2020

steel research int.

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The dual‐phase steel sample obtained by step quenching (SQ) of AISI 1020 steel is shock loaded using one‐stage light‐gas gun experiments. The free surface particle velocity is measured by Doppler pin system (DPS) during the loading experiment. The effect of phase interface on spallation damage nucleation and evolution in dual‐phase steel is investigated with optical microscopy (OM), nanoindentation, and electron backscatter diffraction (EBSD) techniques. The evolution mechanism of spallation damage in dual‐phase steel is systematically analyzed. The results show voids nucleated within martensite rather than at the martensite/ferrite interface under dynamic loading. The nucleation of voids in martensite was not random, the martensite block boundaries with a great Taylor Factor (TF) mismatch and a large angle to the impact direction were the preferred nucleation positions of the voids. Voids nucleate, grow and further coalesce into microcracks. Most of the microcracks propagate across the phase interface and the propagation direction hardly deflects. Due to the existence of many martensite blocks with high‐angle grain interface boundaries inside the martensite, the resistance of microcracks propagation in martensite is greater than that in ferrite. Furthermore, the size of microcracks is related to the angle between the direction of martensite blocks and shock direction.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effects of the Phase Interface on Spallation Damage Nucleation and Evolution in Dual‐Phase Steel

Yang

Wang

et al. 2020

steel research int.

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“…All GBs in this work have a loading direction parallel to the GB normal, which is most susceptible to failure [10,31,32]-up to an order of magnitude more likely to nucleate a void than loading directions perpendicular to the GB normal [17]. The orientation allows the probing of properties versus misorientation angle without needing to factor in the effects of the GB's orientation with respect to the loading direction, which was found to be sometimes significant [17,20]. A large benefit of this method is allowing for reduced simulation size and computational time.…”

Section: Methodsmentioning

confidence: 98%

“…The stress concentrations are governed by elastic and plastic incompatibilities of lattices on either side of the GB. These effects have been systematically studied via crystal plasticity calculations, finding that elastic and plastic stress concentrations are primarily affected by the tilt component of GB misorientation with the twist component being relatively inconsequential [11,[18][19][20]. MD simulations have also found that both Cu and Ta systems fail more quickly on grain boundaries oriented normal to the load direction due to the higher resolved normal stress [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Boundary Misorientation on Spall Strength in Ta via Shock-Free Simulations with Relatively Few Atoms

Caulkins

Fauver

Adibi

et al. 2022

Metals

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A suite of 37 molecular dynamics simulations is conducted at two system sizes to systematically characterize the role of grain boundary (GB) misorientation on spall strength in pure BCC tantalum (Ta). The systems studied consist of bicrystals with a single [110] symmetric tilt grain boundary. Two loading conditions are compared: (i) homogeneous extension under uniaxial strain simulated in this study and (ii) piston/flyer impact of sample, which induces heterogeneous deformation via shockwave propagation along the length of the sample. The piston/flyer impact is taken from the literature and run on the same set of GB misorientation angles using LAMMPS. The major finding here is that both methods result in similar spall strength predictions, but the homogeneous extension method generally requires two to three orders of magnitude fewer atoms and similar reductions in computational costs. Spall strength results systematically overpredict using this method, by about 10% for the dataset three orders of magnitude smaller than piston/flyer simulations, and 5% for the dataset two orders of magnitude smaller. Lastly, the effect of system size and pre-compression magnitude on spall strength is systematically characterized.

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“…They first examined void statistics in spall of polycrystalline copper, correlating the shape of captured voids to potential microstructure features where failure nucleates such as high-angle grain boundaries [13,14]. Their findings were compared against numerical simulations incorporating crystal plasticity and void growth models with good agreement [17,18]. Subsequently, they applied their approach to nickel and titanium polycrystals, finding that there may be potential thresholds in the statistics that can differentiate between when a void has just nucleated, grown, or coalesced [15].…”

Section: Introductionmentioning

confidence: 99%

Estimating Void Nucleation Statistics in Laser-Driven Spall

Mallick

Parker

Wilkerson

et al. 2020

J. dynamic behavior mater.

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We examine the statistical distribution of critical nucleation pressures necessary to dynamically grow voids during the spall failure of an AZ31B magnesium alloy. The approach uses laser-driven micro-flyers to generate spall over times of the order of tens of nanoseconds, allowing us to focus on void nucleation processes rather than void coalescence processes. Our methodology combines quantitative postmortem characterization of void mediated failure with time-resolved interferometry of the failure event, and reveals the dynamics of the failure process. We infer the distribution of the underlying nucleation pressures and explore the associated strain rate dependence of spall strength in these alloys.

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Three-Dimensional Characterization and Modeling of Microstructural Weak Links for Spall Damage in FCC Metals

Cited by 31 publications

References 44 publications

Effects of the Phase Interface on Spallation Damage Nucleation and Evolution in Dual‐Phase Steel

Effects of the Phase Interface on Spallation Damage Nucleation and Evolution in Dual‐Phase Steel

Effect of Grain Boundary Misorientation on Spall Strength in Ta via Shock-Free Simulations with Relatively Few Atoms

Estimating Void Nucleation Statistics in Laser-Driven Spall

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