Wave Propagation in Beryllium Single Crystals

Pope, L.E.; Stevens, A.L.

doi:10.1007/978-1-4615-8696-8_19

Cited by 12 publications

(4 citation statements)

References 11 publications

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“…This work applies to geological materials as well as to metals as long as conditions of elastic behavior hold. Experimental and theoretical work has been carried out on the anisotropic elastic-plastic behavior of ductile materials subject to plane-wave loading [e.g., Johnson, 1972a, b; Johnson, 1972, 1974;Pope and Stevens, 1973], but no previous work has been reported on inelastic plane-wave propagation in anisotropic rocks or other brittle materials. It is also expected that previous work carried out for anisotropic ductile materials will not generally apply to rocks because of the strong dependence of the yield strength on confining pressure, which exists in the latter case but not in the former.…”

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confidence: 99%

Inelastic plane-wave propagation in anisotropic rocks

Johnson¹

1974

J. Geophys. Res.

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The equations for combined elastic and inelastic plane‐wave propagation in anisotropic rocks are developed in terms of familiar laws of plasticity. The total strain is the sum of the elastic and plastic contributions. The elastic component of strain is related to the stress according to Hooke's law, and the plastic strain is obtained from the yield function and an associated flow rule. The general equations apply to materials of any symmetry, but specific calculations are performed for materials of transverse isotropy related to parallel planes of weakness, i.e., bedding planes. Wave speeds, stress amplitudes, etc., depend on the direction of wave propagation with respect to the bedding planes. Velocities of the inelastic waves differ in loading and unloading. Analytical and numerical solutions to the problem of a finite‐duration step load applied over a planar surface are presented. It is shown that wave attenuation is also dependent on wave propagation direction.

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confidence: 99%

Inelastic plane-wave propagation in anisotropic rocks

Johnson¹

1974

J. Geophys. Res.

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“…In Figure 5. 19 demonstrate a strain-rate dependence of the spall strengths for both epoxies, which again differ from the response of PMMA.…”

Section: Epon 828 Epoxymentioning

confidence: 72%

“…The strong influence of the curing agent on the spall strength is evident from Figures 5.18 and 5 19,. where the spall strength of EPON 828-A was, on average, 29% higher than that of EPON 828-B.…”

mentioning

confidence: 83%

“…Following Hopkinson's early work, little additional research on spall fracture was performed until the 1950s when Rhinehart [13] used a modified split Hopkinson bar to identify the critical stress at which spall fracture occurrs in steel, brass, copper, and an aluminum alloy [2]. In the years leading up to the 1980's, remarkable advances were made in understanding spalling of metals by a number of Western research groups, most notably: Sandia National Laboratories [14][15][16][17][18][19][20][21][22], the Los Alamos National Laboratory [23,24], and the Stanford Research Institute [25][26][27].…”

Section: Metalsmentioning

confidence: 99%

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An Experimental Investigation of Spall Fracture in Neat Epoxy and an Epoxy/Carbon Nanotube Composite

Pepper¹

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The spall strength of a material can be used to parameterize its ability to resist tensile failure under high-strain-rate loading. Dynamic failure in an assortment of representative materials was studied. A focus was placed on characterizing the mechanical properties of a polymer-matrix composite. Load frame testing was carried out to measure mechanical properties at quasi-static strain rates, while plate impact experiments were conducted to examine material response under dynamic loading conditions. Successful identification of the spall strengths and fracture toughnesses of aluminum 6061-T6 and polymethylmethacrylate (PMMA) validated the methods used in this investigation. An effect of the curing agent on the spall strength of an epoxy was identified.Nanotubes were found to have a detrimental effect on the dynamic mechanical properties of the resulting nanocomposite. Fracture surfaces of recovered nanocomposite fragments were imaged using a scanning electron microscope to identify failure mechanisms and propose a failure process.i

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Wave Propagation and Spallation in Textured Beryllium

Stevens

Pope

1973

Metallurgical Effects at High Strain Rates

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Wave Propagation in Beryllium Single Crystals

Cited by 12 publications

References 11 publications

Inelastic plane-wave propagation in anisotropic rocks

Inelastic plane-wave propagation in anisotropic rocks

An Experimental Investigation of Spall Fracture in Neat Epoxy and an Epoxy/Carbon Nanotube Composite

Wave Propagation and Spallation in Textured Beryllium

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