冻结恢复法对金属圆柱壳高速断裂的影响

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

摘要

冷冻复原法(FRM)是研究爆炸载荷下金属圆柱壳体高速断裂过程的重要方法。然而,恢复过程对此类炮弹变形和断裂行为的确切影响仍不清楚,极大地限制了该方法在高速断裂研究中的广泛应用。本文利用裂纹演化模拟方法和无损裂纹检测技术,定量评估了中间壳体在不同断裂发展阶段的膨胀轮廓、断裂模式和损伤状态的影响。复原的壳体轮廓能有效代表壳体在等效时刻的自由膨胀轮廓,误差小于 4%。冲击在壳体外壁诱发拉伸裂纹,导致局部断裂模式发生变化。针对这种影响,提出了一种消除裂纹的方法和复原壳体损伤统计中的等效方法。在消除多余拉伸裂纹的影响后,复原壳体可在等效时刻表征自由膨胀过程中的损伤演变。根据应力分析和能量守恒原理,探讨了壳体外壁拉伸裂纹的形成机理,阐明了拉伸裂纹与恢复时间的相关性。研究表明,随着时间的推移,冷冻复原造成的断裂损伤影响逐渐减小。基于硬恢复原理的改进冷冻恢复方法成功用于多级中间壳体的恢复,满足了在高速断裂场中获取瞬态物理模型的需求。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of freeze recovery method on high-speed fracture in metal cylindrical shells

The freeze recovery method (FRM) is a crucial approach for investigating the high-speed fracture process of metal cylindrical shells under explosive loading. However, the precise impacts of the recovery process on the deformation and fracture behavior of such shells remain unclear, significantly constraining the widespread application of this method in high-speed fracture studies. This paper quantitatively evaluates the effects of the expansion contour, fracture mode, and damage state of intermediate shells at different stages of fracture development using a crack evolution simulation method and nondestructive crack detection technique. The recovered shell contour can effectively represent the free expansion contour of the shell at the equivalent moment, with an error of less than 4%. Impact induces tensile cracks on the outer wall of the shell, which leads to changes in the local fracture mode. A method of crack elimination and equivalence in the damage statistics of the recovered shell is proposed to address this effect. The recovered shell can characterize the damage evolution during free expansion at the equivalent moment after eliminating the influence of excess tensile cracks. Based on the principle of stress analysis and energy conservation, the formation mechanism of tensile cracks in the outer wall of the shell is explored, and the correlation between tensile cracks and recovery time is elucidated. The study shows that the impact of fracture damage caused by freezing recovery is gradually reduced over time. The improved freezing recovery method based on the hard recovery principle is successfully used to recover the multistage intermediate shell, meeting the demand for obtaining the transient physical model in the high-speed fracture field.

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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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