Mechanics of dynamic penetration into soil medium

Bivin, Yu. K.; Simonov, I. V.

doi:10.3103/s0025654410060130

Cited by 14 publications

(8 citation statements)

References 17 publications

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“…Figure 9 predicts the same values of the critical impact velocity as those determined in Fig.8. According to Fig.9, the turning angle of the projectile during curvilinear motion increases with the relative COM L C /L, which agrees with the conclusions made in [20,21]. Figure 9 also shows that all projectile trajectories will eventually turn into linear motion after a curvilinear motion, which has been observed in penetration experiments shown in Section 3.3.…”

Section: Influence Of Initial Attack Angle On Projectile Trajectory Asupporting

confidence: 79%

“…A general framework of non-linear differential equations describing the projectile penetration has been established in previous studies (e.g. [17][18][19][20][21]) based on DAFL approach and semi-empirical resistance function. It has been found that the projectile trajectory may change abruptly around a critical impact velocity, which was considered as a trajectory instability problem [17].…”

Section: Waterways Experiments Station (Wes) To Develop 2-d (Penco2d) mentioning

confidence: 99%

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Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Gao

2017

International Journal of Mechanical Sciences

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Section: Influence Of Initial Attack Angle On Projectile Trajectory Asupporting

confidence: 79%

Section: Waterways Experiments Station (Wes) To Develop 2-d (Penco2d) mentioning

confidence: 99%

Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Gao

2017

International Journal of Mechanical Sciences

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“…Cavitation phenomenon was observed during motion of particularly shaped blunt bodies in some types of soils (e.g. sand) in certain range of velocity [59][60][61][62] whereby the cavity is formed, and the projectile moves inside the cavity without contact of its lateral surface with a barrier. This phenomenon results in (i) sharp reduction of drag and (ii) independence of drag on the projectile shape as long as the projectile remains inside the cavity.…”

Section: Some Methodological Remarksmentioning

confidence: 99%

Shape optimization of high-speed penetrators: a review

2012

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In spite of a large number of publications on shape optimization of penetrating projectiles there are no dedicated surveys of these studies. The goal of the present review is to close this gap. The review includes more than 50 studies published since 1980 and devoted to solving particular problems of shape optimization of high-speed penetrators. We analyze publications which employed analytical and numerical method for shape optimization of high-speed penetrators against concrete, metal, fiber-reinforced plastic laminate and soil shields. We present classification of the mathematical models used for describing interaction between a penetrator and a shield. The reviewed studies are summarized in the table where we display the following information: the model; indicate whether the model accounts for or neglects friction at the surface of penetrator; criterion for optimization (depth of penetration into a semi-infinite shield, ballistic limit velocity for a shield having a finite thickness, several criteria); class of considered shapes of penetrators (bodies of revolution, different classes of 3-D bodies, etc.); method of solution (analytical or numerical); in comments we present additional information on formulation of the optimization problem. The survey also includes discussion on certain methodological facets in formulating shape optimization problems for high-speed penetrators.

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“…Технический пластилин (ТП) находит широкое применение, например, при тестировании средств индивидуального бронирования как среда, регистрирующая форму и глубину вмятины после удара пулей или ножом в бронежилет [1, 2], как модельный материал при изучении процессов обработки давлением (ковка, штамповка, прокатка [3][4][5][6][7][8]), при моделировании процессов пенетрации [9][10][11][12][13][14][15][16]. При нормальных условиях пластилин показывает себя низкомодульным вязкоупругим материалом.…”

Section: Introductionunclassified

“…ТП не являет-ся конструкционным материалом, и этим определяется отсутствие справочных данных о его механических свойствах. Отметим также, что математические модели пластилина используются в численных методах оценки качества бронежилетов [9][10][11][12][13][14][15], поэтому исследования механических свойств ТП являются актуальными.…”

Section: Introductionunclassified

Mechanical properties of technical plasticine under static and dynamic loadings

Sapozhnikov¹,

Ignatova²

2014

PNRPU M.B

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This paper presents experimental studies of the mechanical properties of technical plasticinewhich is a composite material consisting of a matrix (a mixture of wax and oils) and particulate filler (talc, clay, pigments)-under tension, compression, shear and penetration of a spherical indenter. At a constant strain rate (tension, compression) "stress-strain" diagrams have been obtained and characterized by a small elastic zone and yield strains up to 15-20 %. On the basis of experimental data power law for dependence of yield strength vs the strain rate in the range of 0.0004 ... 80 s-1 have been obtained. Thus, the deformation of technical plasticine can be described by viscoelastic Norton-type model with a serial connection of elastic and viscous elements. Under the tensile and shear strain of the technical plasticine over 3…5 % it begins to rapidly accumulate scattered microdamages, which does not allow using shear test as a test for determination of the yield stress like in the known methods related to metals. The yield stresses under tension and compression are close at the same strain rates. A linear diagram "force-penetration depth" down to a depth of 3 mm are obtained at penetration of a spherical indenter with a diameter of 43 mm in a plasticine block of 75 mm thick. Thus, the plasticine hardness is constant at a certain strain rate. The authors have managed to get dynamic hardness as the energy of a falling body, divided by the volume of cavity in the plasticine. Static and dynamic penetration is a promising method for the study of plastic properties of materials because of its simplicity. However it is necessary to establish the correlation coefficient relating hardness and yield stress. For the considered material such ratio is 0.24 at the frictionless condition.

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Mechanics of dynamic penetration into soil medium

Cited by 14 publications

References 17 publications

Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Shape optimization of high-speed penetrators: a review

Mechanical properties of technical plasticine under static and dynamic loadings

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