Decay of elastic waves in alumina

Marom, H.; Sherman, Dov; Rosenberg, Z.

doi:10.1063/1.1313779

Cited by 18 publications

(16 citation statements)

References 9 publications

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“…Refs. [224][225][226][227], although doubts have recently been expressed about this interpretation of the data [206]. Anyway, Grady is on record as saying [215,216] that in some circumstances the older model of Mott [210] is superior to his own.…”

Section: Article In Pressmentioning

confidence: 97%

“…[198]. claim that in some brittle materials (such as alumina) failure does not propagate very far into the material from the impact surface [202][203][204], although others claim this may be a measurement artefact [205,206]. A few researchers have linked failure fronts to resistance to ballistic or hypervelocity impact [201,[207][208][209].…”

Section: Article In Pressmentioning

confidence: 99%

“…(ii) What governs the decay of the elastic precursor in those ceramics that exhibit this phenomenon [206]? (iii) How does the shear strength of a shocked specimen affect its ballistic resistance [250]?…”

Section: Article In Pressmentioning

confidence: 99%

See 2 more Smart Citations

Review of experimental techniques for high rate deformation and shock studies

Field¹,

Walley²,

Proud³

et al. 2004

International Journal of Impact Engineering

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Section: Article In Pressmentioning

confidence: 97%

Section: Article In Pressmentioning

confidence: 99%

See 1 more Smart Citation

Review of experimental techniques for high rate deformation and shock studies

Field¹,

Walley²,

Proud³

et al. 2004

International Journal of Impact Engineering

653

296

View full text Add to dashboard Cite

“…In Ref. 5 we reported results with several backing materials in order to optimize gauge response. Most of the experiments reported here, with different tile thicknesses, were performed with neoprene, which was found to be the optimal material.…”

Section: Methodsmentioning

confidence: 99%

On the inelastic shock profile in alumina

Marom

Sherman

Rosenberg

et al. 2002

Journal of Applied Physics

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The inelastic behavior and failure of dense glass under shock loading to 15 GPa J. Appl. Phys. 98, 063504 (2005); 10.1063/1.2041840Compression and shear wave measurements to characterize the shocked state in silicon carbideThe dynamic response of alumina specimens, above their elastic limits, was studied using planar impact experiments with different tile thickness. Stress-time measurements with manganin gauges show a steady spreading of the inelastic portion of the shock profile with increasing tile thickness. Such behavior is typical of elastic waves moving at a constant speed that depends on their amplitude. This finding supports recent interpretations of the failure ramp, by which the elastic response of these materials should be extended to higher stresses than the initial jump. However, further analysis of these profiles raises some questions regarding the exact determination of the Hugoniot elastic limit.

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“…Rosenberg [15], Grady and Moody [16] measured the Hugoniot elastic limit of several ceramics by using plate impact experiments. Murray [17], Marom [18] and Grady [19] made many experiments to investigate whether Hugoniot elastic limit of material was constant. Kennedy [20] measured spallation strength of four micro-structural composite TiB 2 +Al 2 O 3 .…”

mentioning

confidence: 99%

Numerical and experimental investigation of the fracture behavior of shock loaded alumina

Ren

Shu

Li³

2010

Sci. China Phys. Mech. Astron.

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Plate impact expeiments are conducted to investigate the dynamic behavior of alumina by using one stage light gas gun. A velocity interferometer system for reflectors (VISAR) is used to obtain Hugoniot elastic limit and the free surface velocity profile, which consists of an elastic wave followed immediately by a dispersive inelastic wave. The stress histories under different impact velocities are measured by in-material manganin gauges. Based on the experimental data a Hugoniot curve is fitted, which shows the compressive characteristics that alumina changes typically from elastic to "plastic", and under higher pressure it will be transferred to similar-fluid state. The turning point of the Hugoniot curve from a high pressure region to a low pressure region is about 11.4 GPa. The fracture process of alumina is simulated by way of finite element code. After the analysis of the fracture mechanism, the numerical results show an important role played by the nucleation and the growth of the cracks in the macroscopic fracture of the alumina target. The numerical predictions of stress histories are compared with the experimental results, which indicates consistency between them. plate impact experiment, hugoniot curve, fracture characteristics, numerical simulation Advanced ceramics are increasingly used in armor, bladed turbine engine and other structural components due to their mechanical properties, such as light weight, high compression strength, high Hugoniot elastic limit. Generally speaking, these materials are very strong in compression and weak in tension. They are also very brittle, but strong after fracture under compression. The materials both intact and fractured are pressure dependent where the strength increases as the confining pressure increases. Excellent ballistic performance against penetrator comes from its unique dynamic mechanical properties. Dynamic mechanical response, dynamic damage and fracture characteristic of ceramic composite armor are all important factors for analyzing ballistic performance against the penetrator.Short duration is characteristic of shock loadings while explosive loadings are devastating in action, which confines the experimental measurement and observation. In addition, the dynamic experimental process involves uncertainty and interferential factor. Therefore, it is difficult to investigate the mechanical behavior, particularly under shock loadings by using single experimental method. However, numerical simulation has the advantage of little interference from the surrounding environment and easy control of simulation conditions. By analyzing the numerical results under different conditions and the trend of changes in important parameters, the numerical simulations will guide the subsequent experiments and the choice of the key parameters. Moreover, numerical simulation explores the unobservable fracture process of the alumina target under high strain rate, and complements the experimental results. In recent years computational explosion mechanics as a new branch of expl...

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Decay of elastic waves in alumina

Cited by 18 publications

References 9 publications

Review of experimental techniques for high rate deformation and shock studies

Review of experimental techniques for high rate deformation and shock studies

On the inelastic shock profile in alumina

Numerical and experimental investigation of the fracture behavior of shock loaded alumina

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