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• W899353969 abstract "The dynamic mechanical response process of the projectile impacting on the recovery system was analyzed by numerical simulation method. The deformation and failure morphology of the recovery system under the impacting experiments, including deformation data at any time during the impact experiment, were reappeared. The results of the numerical simulation were in good agreement with experimental, and provide a basis for the improvement of the structure design. Introduction Numerical simulation is an important way to study of impact dynamics, the finite element simulation technology research objects in the high speed collision process of stress change, compared with the experimental research, can shorten the analysis time, and reduce the cost. It involves with many degrees of freedom system, the material, and the boundary geometry, loads multiple nonlinear transient dynamic response problems, and such as solving process involves many aspects, such as: the geometric nonlinearity and contact boundary finite strain and the structural failure of treatment. In order to obtain the reliable results which are satisfied with the requirement of engineering, the initial mesh, the choice of material constitutive model, using the algorithm, the final calculation accuracy and efficiency of processing are put forward higher requirements. Projectile impacts target experiment, in order to ensure the acceleration and the ability to play a certain body better recovery, the recovery system must be reasonable designed to ensure the reliability of the impact experiment. Based on the dynamic finite element program LS-DYNA, the dynamical mechanical response process of the ball head projectile impacting recovery system of the experiment is simulated. The stress, strain and damage morphology of recycling system are obtained. By changing the structure and material of recovery system design, the weak links of recovery system are pointed out. The deformation and failure model of the recycling system obtained from the numerical simulation are consistent well with the experiment. The numerical simulation determines the experimental scheme and provides theoretical basis for structure design improved. The Experimental System Introduction The specimen of diameter Ф120 mm ~Ф230 mm is installed on the recovery system, through Ф 120 mm projectile impact, the specimen is loaded. The recovery system consists of cylinder, damping block, shielding, installation disk and the composition of connecting plate. It is Ф400 250 mm and its quality is about 13 kg, shown in figure 1. Its main function has two: one is the soft recovery for the projectile; Second, as a specimen holder, used to install Ф120 mm ~Ф230 mm specimen or sensors. The cylinder is collector installed base of each component parts. Equipped with diaphragm in the cylinder, cylinder can be divided into two parts. The front space is used for installation of sensors and at the back of space the damping piece is installed. The material of the cylinder is 7a04.And its diameter is 250 mm, thickness is 5mm, shown in figure 2. International Conference on Material Science and Application (ICMSA 2015) © 2015. The authors Published by Atlantis Press 742 Fig. 1 Recycle System Fig.2 Cylinder Fig. 3 Damping Block The damping block is used to reduce and recycle the specimen. Its material is the silicon rubber. Its overall dimensions is 240mm, 260mm and the diameter of the inner hole r is 118mm, deep is 162 mm and quality is 6.1 kg (according to 1.30 g/cm3 density gauge). To reduce the quality of the damping block, groove is in the axial direction of. Damping block is overall vulcanization molding, shown in figure 3. The ball head projectile is adopted in the impact experiment as shown in figure 4. The diameter of the projectile is material is aluminum alloy. The impact velocity is about 150 m/s. Fig. 4 Projectile of the Experiment Finite Element Simulations Finite Element Model The dynamical mechanical responses process of the ball head projectile impacting to the recovery system is simulated by LS-DYNA program. The finite element model is shown in figure 5. The numerical simulation model contains the cylinder and damping block and ignores confinement, installation disk and connecting plate. Fig. 5 The Finite Element Model of the ModelI Time integral using the explicit central difference method; Erosion dynamic contact algorithm is adopted to realize the interaction between the projectile and the recovery system. The viscous damping is used to eliminate hourglass caused by single points of integral model. In order to optimize the calculation time step and save machine, the automatic time step is adopted. cylinder Damping block projectile" @default.
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• W899353969 date "2014-01-01" @default.
• W899353969 modified "2023-09-23" @default.
• W899353969 title "Numerical Simulation on Impacting Experiments of the Projectile Recovery System" @default.
• W899353969 doi "https://doi.org/10.2991/icmsa-15.2015.136" @default.
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