Abstract
Reverse ballistic impact test, which can obtain the response data of rod/projectile more comprehensive and quantitative than forward impact test, was widely used for the measurement of material dynamic and structure response. Based on the DIC technology and traditional optical measurement (high-speed camera measurement), the Taylor experiment of reverse ballistic with different length-diameter ratio and different impact velocities were carried out by 57 mm compression-shear type light-gas gun, which provides the instantaneous response data of the Taylor rod in microsecond level. Then, the transient structural deformation of the specimen and the characteristics of plastic wave propagation were analysed by DIC technology and compared with traditional optical measurement. Applying the theory of reverse Taylor impact deformation and combining with the simulation results by LS-DYNA, the rules of structure deformation and plastic wave propagation were obtained. The method above can be applied for the structure response of penetrator under the condition of reverse ballistic penetration.
Highlights
The structure response of projectile during the impact process includes the deformation, the propagation and interaction of stress wave, the destruction mechanism and so on
High-speed digital image correlation (DIC) is a kind of non-contact strain testing system, which break through the limitation of traditional electrical tests and improve the optical deformation measurement
Compared with the simulation results, the deformation of Taylor rod influenced by wave propagation characteristics were further studied, which proves the feasibility of DIC method in reverse ballistic test
Summary
The structure response of projectile during the impact process includes the deformation, the propagation and interaction of stress wave, the destruction mechanism and so on. High-speed digital image correlation (DIC) is a kind of non-contact strain testing system, which break through the limitation of traditional electrical tests and improve the optical deformation measurement. It is fast, simple and accurate to process the data, and improves the efficiency. In order to research the plastic wave propagation of specimen in reverse Taylor impact test, DIC was applied to measure the deformation rules of specimens with different velocities and structure, in addition, the plastic wave propagation was analyzed. Compared with the simulation results, the deformation of Taylor rod influenced by wave propagation characteristics were further studied, which proves the feasibility of DIC method in reverse ballistic test
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