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The spall behavior of uranium is investigated using direct laser ablation loading experiments. The uranium targets are cut and ground to 0.05 mm, 0.1 mm, and 0.15 mm in thickness. Laser energies are varied to yield a constant peak pressure. This results in different strain rates and varying degrees of damage to the uranium targets. The spall strength is calculated and analyzed from the free surface velocity histories recorded using a line velocity interferometer for any reflections system. The spall strength increases from 4.3 GPa to 9.4 GPa with strain rates ranging from 4.0 × 10~6 s~(-1) to 1.7 × 10~7 s~(-1). Post-mortem analysis is performed on the recovered samples, revealing the twin-matrix interfaces together with the inclusions to be the primary factor governing the spall fracture of uranium. 相似文献
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采用多介质弹塑性流体动力学计算方法,研制了适用于复杂加载的Lagrange计算程序MLEP,对劳伦斯利弗莫尔国家实验室(Lawrence Livermore National Laboratory,LLNL)19层和冲击波物理与爆轰物理国防科技重点实验室(Laboratory of Shock Wave and Detonation Physics,LSD)设计的29层Mg-Cu体系Pillow密度梯度飞片气炮加载实验过程进行了数值模拟和比较,获得的速度剖面计算结果与实验测试结果吻合一致,验证了流体动力学计算方法、不同材料体系混合模型以及计算程序的有效性和实用性,为进一步开展可控路径的复杂加载实验研究奠定了基础。 相似文献
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Magnetic Transformations and Polymorphic Transition of Ferromagnetic Steels under Shock-Wave Loading
Technical Physics - A method for recording magnetic transformation is presented for ferromagnetic steels under shock-wave loading. The operation of the magnetic transformation gauge is considered... 相似文献
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Russian Physics Journal - The paper presents the results of numerical simulation of loading of cylinders made of the type VZhM8 singlecrystal alloy which is used in the production of gas-turbine... 相似文献
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采用VISAR和X光联合测试技术,利用等厚对称和逆向碰撞法测量了FeMnNi合金高压加卸载历程和相变层裂信息。加载过程中,FeMnNi合金样品发生α→ε相转变,相变波速大于塑性波速,在撞击面上相变波与塑性波合并成单一相变波;卸载过程中,FeMnNi合金样品可能发生了逆相变,形成了除合并相变波在自由面反射中心稀疏波R以外的两道卸载波S1和S2。等厚对称高压加载下,FeMnNi合金样品发生了二次层裂。分析中心稀疏波R、卸载波S1和S2在样品中的传播作用过程,发现样品发生冲击相变和卸载逆转变是导致其等厚对称高压加载下发生二次层裂行为的主要原因。 相似文献
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Physics of the Solid State - The article is devoted to the study of the features of dynamic deformation and destruction of porous iron under the influence of a cumulative “knife.” It is... 相似文献
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《中国物理快报》2017,(5)
The spallation behaviors of AI+0.2 wt% ~(10)B targets and neutron irradiated AI+0.2 wt% ~(10)B targets with 5 nm radius helium bubble subjected to direct laser ablation are presented. It is found that the spall strength increases significantly with the tensile strain rate, and the helium bubble or boron inclusions in aluminum reduces the spall strength of materials by 34%. However, slight difference is observed in the spall strength of unirradiated samples compared with the irradiated sample with helium bubbles. 相似文献
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Belov N. N. Yugov N. T. Tabachenko A. N. Afanasyeva S. A. Valuiskaya L. A. Konyaev A. A. Martsunova L. S. 《Russian Physics Journal》2002,45(8):791-799
The behavior of cermets under shock-wave loading conditions is examined. The materials under study are produced by self-propagating high-temperature synthesis. A mathematical model for calculating the stress-strain state and fracture of the TiB + B4C-based cermet is developed. 相似文献
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冲击载荷作用下边界条件对方板的毁伤破坏具有很大影响。利用落锤试验机开展了不同边界支撑下固支方板的冲击试验,为获取固支方板边界撕裂的典型破坏模式,专门设计加工了与固支方板尺寸相当的冲击锤头和可改变倒角的方板支撑框架。研究结果表明:(1)冲击载荷作用下,固支方板呈现出塑性大变形、单边撕裂、双边撕裂等典型破坏模式,倒角越小,方板越容易撕裂;(2)边界支撑对固支方板中心位移、整体变形轮廓影响较小,但对方板的撕裂长度、临界撕裂阈值存在较大影响;(3)不同边界支撑主要改变方板边界处的剪切应变,边界支撑倒角越小,剪切效果越明显,方板边界临界撕裂应变位于[0.191,0.241]区间。 相似文献
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对冲击波参数的测量开发了两种光纤探针,以满足强电磁环境和冲击压力较低的情况。一种是冲击自发光光纤探针,另一种是闪光隙光纤探针。这两种光纤探针分别利用融凝石英在受到冲击压缩时发光和氩气(或空气)隙在受到压缩时会产生很强的光辐射的机理研制而成的。自发光光纤探针在大于70 GPa冲击压力下,其信号上升时间在1~3 ns之间;闪光隙光纤探针在10~30 GPa的冲击压力下,其信号上升时间稳定在2~7 ns之间。 相似文献