The Failure Waves and Spallations in Homogeneous Brittle Materials

Kanel, G. I.; Rasorenov, S.V.; Фортов, В. Е.

doi:10.1016/b978-0-444-89732-9.50102-3

Cited by 82 publications

(78 citation statements)

References 3 publications

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“…If the input stress level is less than the Hugoniot elastic limit, it is expected that an elastic wave of finite amplitude will propagate in the brittle solid. This expected response has been questioned by recent experimental shock wave studies on K-2 glass [2], That work has provided evidence for the propagation of a delayed front of fracture following the initial elastic compression wave. This new phenomenon has been identified as a failure wave, and is presumed to be a shear fracture process which is driven by the large shear strain energy residing in the body behind the elastic uniaxial-strain compression wave.…”

Section: Failure Waves In Ceramicsmentioning

confidence: 87%

“…The early work suggested that the failure wave may be a propagating fracture front trailing the initial elastic shock wave at a velocity substantially less than the shock velocity [2]. A failure wave velocity closer to the Rayleigh wave speed has been proposed by Raiser and Clifton [ 121.…”

Section: Failure Waves In Ceramicsmentioning

confidence: 99%

“…Recently, a further shock-induced failure process has been suggested for brittle solids in which shear failure (possibly shear fracture) occurs separate from the compressive shock wave [2]. This phenomena has been identified as a failure wave which propagates through the solid at some distance behind the compressive shock wave, relieving the large state of shear strain.…”

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confidence: 99%

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Shock Properties of High-Strength Ceramics

Grady

1995

Computational Mechanics ’95

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Section: Failure Waves In Ceramicsmentioning

confidence: 87%

Section: Failure Waves In Ceramicsmentioning

confidence: 99%

mentioning

confidence: 99%

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Shock Properties of High-Strength Ceramics

Grady

1995

Computational Mechanics ’95

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“…Planar impact tests on thin metal targets (1 mm or less), and at different temperatures have been recently reported in [2]. In these tests the authors focused on the elastic precursor wave amplitudes, and observed that for higher temperatures the rate of elastic precursor decay is slower.…”

Section: Anomalous Thermal Strengtheningmentioning

confidence: 99%

Overstress and flowstress approaches to dynamic viscoplasticity

Partom

2015

EPJ Web of Conferences

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Abstract. Viscoplasticity is mostly modelled by the flowstress approach, where the flowstress (Y) is a function of pressure, temperature, plastic strain and strain rate Y(P,T, ε p ,ε). For dynamic Viscoplasticity the flowstress approach is used in hydrocodes together with the radial return algorithm, to determine deviatoric stress components in each computational cell and for each time step. The flowstress approach assumes that during plastic loading, the flowstress in stress space follows the current stress point (current Y). Unloading of a computational cell is therefore always elastic. The overstress approach to dynamic viscoplasticity was used in various versions in the 1950s and early 1960s, before the advent of hydrocodes. By the overstress approach a state point may move out of the quasistatic flow surface upon loading, and hence the term overstress. When this happens, the state point tends to fall back (or relax) onto the quasistatic flow surface through plastic flow, and the rate of this relaxation is an increasing function of the amount of overstress. In the paper we first outline in detail how these two approaches to dynamic viscoplasticity work, and then show an example for which the overstress approach has an advantage over the flowstress approach. The example has to do with elastic precursor decay in planar impact, and with the phenomenon of anomalous thermal strengthening, revealed recently in planar impact tests. The overstress approach has an advantage whenever plastic flow during unloading is of importance.

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“…Do not return it to the originator. Kanel et al (1992) shock loaded K-19 glass in a normal plate-on-plate impact test, and the VISAR (velocity interferometer system for any reflector) measurement of normal velocity at the free surface contained a second plateau that they interpreted as evidence of a failure wave (figure 1a). Impact by the flyer plate introduces a compressive shock into the target plate.…”

Section: Disclaimersmentioning

confidence: 99%

Application of a Brittle Damage Model to Normal Plate-On-Plate Impact

Raftenberg¹

2006

AIP Conference Proceedings

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)December 2005 ARL-TR-3634 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTA brittle damage model presented by Grinfeld and Wright of the U.S. Army Research Laboratory was implemented in the LS-DYNA 1 finite element code and applied to the simulation of normal plate-on-plate impact. The damage model introduces a state variable measure of damage that evolves in proportion to the elastic strain energy. The model degrades the elastic shear modulus in proportion to the state variable's current level. In a simulation of normal plate-on-plate impact, the model produced a gradient in elastic properties within the initially homogeneous target, and this gradient led to a partial reflection of the unloading wave. For a range of values for the material constants introduced by the damage model, the target's free-surface velocity showed a gradual increase over time following the arrival of the initial compressive shock. iii

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The Failure Waves and Spallations in Homogeneous Brittle Materials

Cited by 82 publications

References 3 publications

Shock Properties of High-Strength Ceramics

Shock Properties of High-Strength Ceramics

Overstress and flowstress approaches to dynamic viscoplasticity

Application of a Brittle Damage Model to Normal Plate-On-Plate Impact

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