Hugoniot stress

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August undefined, 2024

WebThe objective of this study was to develop a micromechanical approach for determining the Mie–Grüneisen EOS parameters of iron under the Hugoniot states. The multiscale shock technique (MSST) coupled with molecular dynamics (MD) simulations was employed to describe the shocked Hugoniot relation of single-crystal (SC) and nanocrystalline (NC) … Web11 feb. 2024 · In the present paper, a comprehensive study on the Hugoniot elastic limit (HEL) and its dependence on associated physical parameters is reported. The observed …

Stress-Density Hugoniot. Download Scientific Diagram

WebAlthough it falls within the reported Hugoniot Elastic Limit of SLG between 2.5 GPa and 7 GPa, ... The stress state was determined by directly measuring the flyer speed, ... WebSuch equations are called hyperbolic conservation laws. The shock speed is given by f (uL ) − f (uR ) jump in f (u) (8) s= = . uL − uR jump in u This equation is called the Rankine-Hugoniot condition. 3. Characteristics of the Burgers equation The characteristics of Eq. colin hertz

中国科学院力学研究所机构知识库(IMECH-IR): Atomistic study of shock Hugoniot …

Webnanoseconds to relax deviatoric stress.27 The relatively long time scale of relaxation in polymers seems inconsistent with an accurate measurement of the Hugoniot over a sub-ns time scale. Yet, here good correspondence between long time scale gas gun measurements of the Hugoniot and our sub- WebHugoniot Elastic Limits (HELs), and Hugoniot stress levels for aluminum alloy 7010-T6 agree with the experimental data. The results are presented and discussed, and future studies are outlined. INTRODUCTION The shock waves and high-strain-rate phenomena are involved in many physical phenomena, therefore, we are Web16 jul. 2004 · Integral feedback is employed to reach the Hugoniot (final) state of the shock process by controlling both the normal component of the stress tensor and internal … dr oghlakian cardiology

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Web1 mei 2024 · An analytical expression of the Hugoniot stress–strain curve has been developed using micromechanical and energetic arguments. In the case of elastic-plastic … Web1 jan. 2024 · Computer Methods in Applied Mechanics and Engineering July 1, 2014. A mixed second order stabilised Petrov–Galerkin finite element framework was recently introduced by the authors (Lee et al., 2014). The new mixed formulation, written as a system of conservation laws for the linear momentum and the deformation gradient, performs … colin heskethWebComparison of high-temperature values of the Hugoniot elastic limit of 15Kh2NMFA steel, iron with a extrapolation shows the intersection of these depen- purity of 99.5% [25], and ARMCO iron [28]. dences at a distance of 1 μm at a compression stress in the elastic precursor of about 8 GPa. drogistin lohn

"WebThe results showed that for both ramp and shock loading,the phase transition stress of Zr increased with the density of impurities increasing.[6]Asay and Gupta tested the influence of impurity density on the attenuation of the elastic precursor decay.It was concluded that the rate of attenuation of high-amplitude elastic waves is reduced for a given defect … " - Hugoniot stress

Hugoniot stress

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Web6 jun. 2007 · The transformed value of Hugoniot stress at the HEL for the 80-μm grain size material and the same type measurements made for 400-, 40-, and 20-μm grain … WebAnalysis of these responses provides a measure of the ceramic's strength behavior as quantified by the shear stress and the strength in the Hugoniot state. While previous …

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WebThe deviator component of the stress in the wave is estimated as the difference between the stress σx from the Rayleigh line and the pressure p from the Hugoniot at the same spe- cific volume V or the strain εx.30,31 For a Hugoniot in the form US ¼ c0 þ bup , the difference between σx and p, without taking into account the yield stress ... Web13 mei 2024 · Rankine-Hugoniot jump condition for non-homogeneous conservation law. 0. Closing a PDE system describing one dimensional fluid flow. 3. A picture of a shock wave for a nxn system of PDEs. 1. Rankine-Hugoniot …

WebThe Hugoniot pressure of an inclined impact is expected to correspond to the normal component of the impact velocity (see Chapter 4). The results of Lavoie et al. (2009) … Webmaximum stress. However, the residual hardness of shock compressed metals is much higher than those loaded quasi-statically to the same total strain. These observations suggest that the deformation mechanisms active during inelastic deformation under shock compression and quasi-static or moderate rates may be quite diﬀerent.

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Web12 apr. 2024 · This study investigated the stress relaxation and fatigue life and strength of laser-peened single-crystal nickel superalloy specimens compared to unpeened and shot-peened specimens following hot corrosion exposure and then fatigue testing. The specimens were treated by conventional laser peening and a new cyclic laser peening …

Web1 mei 2024 · This phenomenon has been investigated using embedded stress sensors and a recovery technique that has allowed observation of the microstructure above and below the Hugoniot Elastic Limit (HEL) and these results are brought together here to explain the observed behaviour. colin hewitson krhWeb12 apr. 2024 · The Hugoniot shock wave velocity \((U_{\textrm{S}})\) –particle velocity \((u_{\textrm{p}})\) curve of polymethyl methacrylate (PMMA) was measured in an experiment using only 2.5 g of a high explosive. The thickness of the plate was varied to accurately determine \(U_{\textrm{S}}\) at an arbitrary position in the PMMA. Image … dr oglander crestwood moWebThe dominant deformation mechanism is clarified under the impact velocities ranging from 300 m/s to 1200 m/s. The main findings from this study are as follows. The shock Hugoniot relation between pressure and specific volume has no clear dependence on the grain size, whereas the corresponding Hugoniot shear stress exhibits a grain size dependence. colin higham facebookWeb秦溶蔓，朱波，乔琨，王东哲，孙娜，袁晓敏. 山东大学材料科学与工程学院，济南 250061. 陶瓷复合防弹装甲由硬质陶瓷与金属背板或纤维复合材料背板叠层，用于防御穿甲弹等高速弹丸侵彻的轻质防护装甲，目前陶瓷复合防弹装甲一直是军用防护领域的研究热点[1−3].陶瓷防弹装甲体系常用 ... colin hickey githubWeb1 sep. 2024 · However, the corresponding Hugoniot shear stress depends on the grain size, which is consistent with the grain size dependence of the yield strength under … colin hewett real estateWebBased on the Hugoniot jump condition and the Grüneisen parameter, the equation of state for dry sand was given by considering porous compaction. According to the associated flow rule, the elasto-plastic stress-strain relationships of dry … colin hibbsWebThen, a tensile stress wave is generated due to the reflection of the compressive wave when the propagated compressive wave reaches a free surface, called a “Hopkinson effect” [16,17,18,19]. ... Hugoniot elastic limit (GPa) 4.500: Intact normalized strength parameter A: 1.248: Pressure component at the Hugoniot elastic limit (GPa) 2.930: dr oglesby ashdown