Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Impact01:30

Impact

143
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
143
Impact: Problem Solving01:26

Impact: Problem Solving

222
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
222
Impact Loading01:19

Impact Loading

196
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
196
Nuclear Power02:36

Nuclear Power

7.8K
Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
7.8K
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

852
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
852
Impulse01:13

Impulse

18.9K
According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
18.9K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Research on the Similarity Law of the Fragmentation Effect of a Reactive Inner Core PELE Penetrating a Steel Plate.

Polymers·2026
Same author

Targeting 15-PGDH/15-oxoETE to mitigate inflammation and senescence in asthma.

Biochimica et biophysica acta. Molecular basis of disease·2026
Same author

The effect of zolpidem on sleep efficiency and obstructive sleep apnea severity in OSA patients: A systematic review and meta‑analysis.

Medicine·2026
Same author

The interaction network of health-related quality of life in elderly people living with HIV: a cross-sectional study in Chongqing, China.

Scientific reports·2026
Same author

Analysis of trends and risk factors of HIV incidence in men who have sex with men in Chongqing, China: a retrospective cohort study, 2013-2022.

BMC infectious diseases·2026
Same author

A multifunctional eutectogel loaded with baicalein and MXene for diabetic infected wound healing under mild photothermal conditions.

Journal of materials chemistry. B·2026

相关实验视频

Updated: Jun 27, 2025

Blast Quantification Using Hopkinson Pressure Bars
09:41

Blast Quantification Using Hopkinson Pressure Bars

Published on: July 5, 2016

9.0K

数字模拟研究对冲击启动屏蔽电荷使用超高速复合结构反应碎片的数字模拟研究.

Yongjin Lu1, Bo Tan1, Yanxia Li2

  • 1College of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, China.

Polymers
|April 27, 2024
PubMed
概括

由PTFE/Al复合材料制成的超高速反应碎片通过释放能量和延长冲击脉冲,在比钢碎片 (2.7公里/秒) 更低的速度 (2.6公里/秒) 启动屏蔽电荷.

关键词:
在PTFE/Al材料.引爆的原因是爆炸.超高速撞击的影响.影响释放的能量释放.屏蔽式充电 屏蔽式充电

更多相关视频

Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
10:52

Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System

Published on: August 7, 2018

8.6K
Evaluating Primary Blast Effects In Vitro
10:51

Evaluating Primary Blast Effects In Vitro

Published on: September 18, 2017

8.0K

相关实验视频

Last Updated: Jun 27, 2025

Blast Quantification Using Hopkinson Pressure Bars
09:41

Blast Quantification Using Hopkinson Pressure Bars

Published on: July 5, 2016

9.0K
Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
10:52

Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System

Published on: August 7, 2018

8.6K
Evaluating Primary Blast Effects In Vitro
10:51

Evaluating Primary Blast Effects In Vitro

Published on: September 18, 2017

8.0K

科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 爆炸物工程 爆炸物工程

背景情况:

  • 了解对屏蔽弹药的反应碎片的冲击启动对于安全和设计至关重要.
  • 之前的研究已经探讨过超高速冲击,但复合反应碎片的具体机制需要进一步研究.

研究的目的:

  • 为了数值模拟和分析PTFE/Al复合结构反应碎片在屏蔽电荷上的冲击启动过程.
  • 为了比较钢涂层和钢半涂层PTFE/Al碎片与钢碎片的爆炸行为.
  • 为了确定冲击启动的门速度,并阐明底层机制.

主要方法:

  • 使用ANSYS/AUTODYN 17.0.0中的光滑粒子水力学 (SPH) 算法进行数值模拟.
  • 验证Lee-Tarver模型用于描述反应物质爆炸.
  • 对钢涂PTFE/Al,钢半涂PTFE/Al和钢碎片影响屏蔽电荷的比较分析.

主要成果:

  • 两种PTFE/Al复合材料碎片的冲击速度值为2.6公里/秒,低于钢碎片的2.7公里/秒.
  • 由于反应能量释放,PTFE/Al碎片增加了爆炸物中冲击波脉冲的持续时间和强度.
  • 复合材料碎片通过持续的脉冲负荷引起了爆炸,而钢碎片则启动了冲击到爆炸的过渡.

结论:

  • 与惰性钢碎片相比,PTFE/Al复合物反应碎片为屏蔽电荷提供较低的启动值.
  • 反应性材料释放的能量增强的冲击波特征是引发引爆的关键.
  • 这些发现为设计超高速反应碎片和了解它们的损伤机制提供了宝贵的科学参考.