Shocked materials at the intersection of experiment and simulation

Lorenzana, H. E.; Belak, J.; Bradley, K. S.; Bringa, Eduardo M.; Budil, K. S.; Cazamias, J.; El-Dasher, Bassem S.; Hawreliak, J.; Hessler, Jan P.; Kadau, Kai; Kalantar, D. H.; McNaney, J. M.; Milathianaki, Despina; Rosolanková, K.; Swift, Damian; Taravillo, Mercedes; Buuren, T. van; Wark, J. S.; Rubia, T. Dı́az de la

doi:10.1007/s10820-008-9107-z

Cited by 17 publications

(5 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Linear Coherent Light Source (LCLS) and other fourth generation light sources may provide such the requisite intensity in the near future. Thus far, a proof of principle SAXS measurement has been made in a static experiment on recovered, incipiently spalled titanium at the Advanced Photon Source [62]. Also, tomography has been used to map the locations and sizes of voids under static conditions also using recovered, incipiently spalled samples [63].…”

Section: Void Volumementioning

confidence: 99%

Void growth in bcc metals simulated with molecular dynamics using the Finnis–Sinclair potential

Rudd

2009

Philosophical Magazine

View full text Add to dashboard Cite

The process of fracture in ductile metals involves the nucleation, growth, and linking of voids. This process takes place both at the low rates involved in typical engineering applications and at the high rates associated with dynamic fracture processes such as spallation. Here we study the growth of a void in a single crystal at high rates using molecular dynamics (MD) based on Finnis-Sinclair interatomic potentials for the body-centred cubic (bcc) metals V, Nb, Mo, Ta, and W. The use of the Finnis-Sinclair potential enables the study of plasticity associated with void growth at the atomic level at room temperature and strain rates from 10 9 /s down to 10 6 /s and systems as large as 128 million atoms. The atomistic systems are observed to undergo a transition from twinning at the higher end of this range to dislocation flow at the lower end. We analyze the simulations for the specific mechanisms of plasticity associated with void growth as dislocation loops are punched out to accommodate the growing void. We also analyse the process of nucleation and growth of voids in simulations of nanocrystalline Ta expanding at different strain rates. We comment on differences in the plasticity associated with void growth in the bcc metals compared to earlier studies in face-centred cubic (fcc) metals.

show abstract

Section: Void Volumementioning

confidence: 99%

Void growth in bcc metals simulated with molecular dynamics using the Finnis–Sinclair potential

Rudd

2009

Philosophical Magazine

View full text Add to dashboard Cite

show abstract

“…Besides, in all practical applications mentioned above, laser compression starts with a finite rise time, typically a few ns, before steepening into a shock wave after propagation over some distance from the irradiated surface, so that the superficial zone of interest is actually subjected to ramp compression. Figure 1 illustrates the dynamical response of polymorphic crystal material such as iron under laser ramp compression [10]. The crystal generally begins to deform elastically along the direction of wave propagation with the lattice coming back to its original configuration on unloading.…”

Section: Introductionmentioning

confidence: 99%

“…Iron was choosen because of its importance in civil engineering, geophysics and astrophysics. [10] of the schematic relation between the microstructural process occuring during ramp compression of crystal and the target rear surface velocity. When the material compressibility changes, due to an elastic-plastic transition or to a phase transformation, the atomic re-organization, in the compression front, modifies the dynamical response of the crystal causing a variation in the slope the measured rear surface velocity.…”

Section: Introductionmentioning

confidence: 99%

Laser-Driven Ramp Compression to Investigate and Model Dynamic Response of Iron at High Strain Rates

Amadou

Brambrink

Rességuier

et al. 2016

Metals

View full text Add to dashboard Cite

Efficient laser shock processing of materials requires a good characterization of their dynamic response to pulsed compression, and predictive numerical models to simulate the thermomechanical processes governing this response. Due to the extremely high strain rates involved, the kinetics of these processes should be accounted for. In this paper, we present an experimental investigation of the dynamic behavior of iron under laser driven ramp loading, then we compare the results to the predictions of a constitutive model including viscoplasticity and a thermodynamically consistent description of the bcc to hcp phase transformation expected near 13 GPa. Both processes are shown to affect wave propagation and pressure decay, and the influence of the kinetics of the phase transformation on the velocity records is discussed in details.

show abstract

“…We suggest how diffraction and transmission electron microscopy experiments may validate our findings. Materials dynamics, particularly the behavior of solids under extreme compression, is a topic of broad scientific and technological interest [1][2][3][4][5]. The shock impulse provides a unique probe to excite and thereby examine the response of materials to dynamic compression.…”

mentioning

confidence: 99%

Collective nature of plasticity in mediating phase transformation under shock compression

et al. 2014

View full text Add to dashboard Cite

An open question in the behavior of metals subjected to shock is the nature of the deformation that couples to the phase transformation process. Experiments to date cannot discriminate between the role of known deformation processes such as twinning or dislocations accompanying a phase change, and modes that can become active only in extreme environments. We show that a deformation mode not present in static conditions plays a dominant role in mediating plastic behavior in hcp metals and determines the course of the transformation. Our molecular dynamics simulations for titanium demonstrate that the transformation is preceded by a 90°lattice reorientation of the parent, and the growth of the reoriented domains is accompanied by the collective action of dislocations and deformation twins. We suggest how diffraction and transmission electron microscopy experiments may validate our findings. Materials dynamics, particularly the behavior of solids under extreme compression, is a topic of broad scientific and technological interest [1][2][3][4][5]. The shock impulse provides a unique probe to excite and thereby examine the response of materials to dynamic compression. It is well known that if a material undergoes shock compression beyond the Hugoniot elastic limit, it exhibits rapid plastic flow which is expected to occur via the generation and propagation of defects (twin, dislocations, etc.) [1,[6][7][8][9][10], and possible phase transformations [11][12][13][14]. In the presence of large peak stresses, strain rates, and significant inelastic strain due to shock, these plastic deformation modes can differ from those observed under longer time scales or more quasistatic conditions [1,6], and may interact with the phase transformations [15,16]. However, when solids undergo phase transformations, a key question is how these deformation modes mediate the phase transformation process.The group-IV hexagonal-close-packed (hcp) metals Zr, Ti, and Hf, with transition temperatures and pressures that are relatively accessible, have served as an excellent test bed for studying aspects of deformation and phase transformation behavior under driven conditions. For the α (hcp) to ω (hexagonal) phase transformation, progress over the last three decades from recovery experiments and analysis of wave profiles [17][18][19] has largely focused on capturing the behavior of the equation of state, orientation relationships in microstructures, understanding the influence of impurities such as oxygen, and characterizing the deformation. A number of studies have recognized that the plastic flow behavior as a result of the transformation is accompanied by twinning and slip under different loading and temperature conditions [18][19][20]. However, recovered samples under shock have invariably been for polycrystals and the deformation modes of twinning and

show abstract

Shocked materials at the intersection of experiment and simulation

Cited by 17 publications

References 60 publications

Void growth in bcc metals simulated with molecular dynamics using the Finnis–Sinclair potential

Void growth in bcc metals simulated with molecular dynamics using the Finnis–Sinclair potential

Laser-Driven Ramp Compression to Investigate and Model Dynamic Response of Iron at High Strain Rates

Collective nature of plasticity in mediating phase transformation under shock compression

Contact Info

Product

Resources

About