Meso–Macro Energy Exchange in Shock-Wave Processes and Dynamic Strength of AB2 Steel

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Physical Mesomechanics Pub Date : 2024-02-01 DOI:10.1134/s1029959924010107

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Abstract

Impact tests of low-alloy martensitic-bainitic steel AB2 showed that the scale of dynamic deformation and the fracture mechanism change in a threshold manner. The change in the mechanism and scale of fracture is triggered by the resonant excitation of large-scale structural elements of the material (grain conglomerates) due to plastic flow oscillations. In this case, the grain-boundary mechanism of dynamic fracture is replaced by a transcrystalline one. Beyond the strain rate threshold, mesoscopic elementary carriers of dynamic deformation are divided into two groups: low-velocity and high-velocity. Accordingly, the velocity distribution of mesoparticles shows two humps. The velocity spread of mesoparticles sharply increases under these conditions, while the mass velocity defect (change in the shock wave amplitude) becomes negative. The latter fact indicates the local acceleration of mesoparticles in discrete regions of the target (the so-called shooting of mesoparticles in the shock wave direction). Transcrystalline cracks are randomly distributed throughout the specimen and have a random orientation.

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冲击波过程中的中宏观能量交换与 AB2 钢的动态强度

摘要低合金马氏体-贝氏体钢 AB2 的冲击试验表明，动态变形尺度和断裂机制以阈值方式发生变化。断裂机理和规模的变化是由塑性流动振荡引起的材料大尺度结构元素（晶粒团块）共振激发的。在这种情况下，动态断裂的晶界机制被跨晶机制所取代。超过应变速率阈值后，动态变形的介观基本载体分为两组：低速和高速。相应地，介观粒子的速度分布呈现出两个驼峰。在这些条件下，介观粒子的速度分布急剧增加，而质量速度缺陷（冲击波振幅的变化）变为负值。后一事实表明，介观粒子在目标的离散区域局部加速（即所谓的介观粒子沿冲击波方向射出）。跨晶裂纹在整个试样中随机分布，并具有随机取向。

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来源期刊

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.