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Stress Potter study long rod projectile penetration of vertical rotation cement target

Author: WangYunYe
Tutor: ZhaoZiLong
School: Taiyuan University of Science and Technology
Course: Solid Mechanics
Keywords: rotary vertical penetration stress wave propagation cylinder cement target
CLC: O347.4
Type: Master's thesis
Year: 2011
Downloads: 90
Quote: 0
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Abstract


In this paper, the impact force and the penetrating displacement on the vertical penetration of a cylinder against half-infinite cement are investigated. First,it is investigated that the vertical penetration of the cylinder against half-infinite cement without rotary effect. Second, it is investigated that the vertical penetration of the cylinder against half-infinite cement with rotary effect.Without considering rotation, by using the model of rigid fluid body and the resultant force direction expansion theory of cement deformation, its dynamic equation is established when the cylinder penetrated vertically half-infinite cement, the numerical solution of the nonlinear dynamic equation is obtained by using difference method. The impact force history curves and the penetration displacement history curves are obtained. The influence of initial penetrating velocities and friction coefficients on penetration displacement and impact force are analyzed. On this basis, its wave equation is established, the numerical solution of the wave equation is obtained, the stress history curves are obtained. The influence of initial penetrating velocities and friction coefficients on stress wave propagation is analyzed.Under considering rotation, by using the model of rigid fluid body and the resultant force direction expansion theory of cement deformation, its dynamic equation is established when the cylinder penetrated vertically half-infinite cement, the numerical solution of the nonlinear dynamic equation is obtained by using difference method. The impact force history curves and the penetration displacement history curves are obtained. The influence of initial penetrating velocities, friction coefficients and initial angle velocities on penetration displacement and impact force is analyzed. On this basis, its wave equation is established, the numerical solution of the wave equation is obtained, the normal stress history curves and the shear stress history curves are obtained. The influence of initial penetrating velocities, friction coefficients and initial angle velocities on normal stress、shear stress and resultant normal stress is analyzed. The studies show that, with the initial penetrating velocities increasing, the amplitude of stress wave will increase, but the propagation of stress is identical; with the friction coefficient increasing, the amplitude of stress wave will increase, but the propagation of stress is identical; with the increasing of the initial angular velocity, the amplitude of the stress will reduce, but the law of stress propagation is identical.

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CLC: > Mathematical sciences and chemical > Mechanics > Solid Mechanics > Deformation solid dynamics > Stress wave
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