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材料科学与工程（中英文B版） 2011年第5期1卷 611-617页

作者： paul wilson bland sarin tiranasawasdi Department of Mechanical Engineering Simulation and Design The Sirindhorn International Thai-German Graduate School of Engineering King Mongkut ＇s University of Technology North Bangkok Bangkok 10800 Thailand

Impact regimes defined by projectile mass and velocity can produce very different characteristic target structural responses, and complex behaviour when the regime boundaries are crossed. This has previously been proven by experimental work. The objective of this work was to qualitatively model the experimentally observed impact behaviour, and to identify any deviation in trends between experiments and the simulation in terms of the type of response, but not in terms of material damage. An explicit FE commercial package was used to simulate the impact of a free flying projectile onto a flat aluminium plate, varying projectile mass and velocity, target span and thickness. Behaviour was characterized by prediction of projectile-target contact time, projectile rebound velocity and target maximum deflection at its mid-span. Two extreme conditions of low velocity/high mass and high velocity/low mass were simulated, and the transition between these two regimes was explored by incrementally varying mass and velocity. For low velocity/high mass, the simulation matched the main trends from the experimental work, with a classic quasi-static large scale global deflection type behaviour of sub first mode rebound. For high velocity/low mass, the agreement was less strong due to a lack of damage mechanics, but still confirming the response was localized to the contact zone. For the transitions between regimes, the simulation also matched the experimental work showing projectile-target intermittent contact when sweeping across the mass boundary, and a delay in global response when sweeping across the velocity boundary. Unlike the experimental work, the simulation allows the easy viewing of stress waves developing over time, which can be used to confirm and explain some of these observations.

关键词：数值模拟弹丸质量实验观察接触时间结构响应定性模拟发展趋势物质损失

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