在低速度冲击下实验和数值研究PBX替代材料的动态损伤和负载转移
Youcai Xiao1, Qin Fu1, Wanqian Yu2
1College of Mechatronic Engineering, North University of China, Taiyuan 030051, China.
Polymers
|May 11, 2024
概括
研究人员开发了一种更安全的聚合物结合糖 (PBS) 材料,作为聚合物结合爆炸物 (PBX) 的替代品. 动态测试和模拟揭示了其机械行为和冲击下的损伤模式,改善了安全评估.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 化学工程是化学工程的重要组成部分.
背景情况:
- 在机械负荷下意外启动爆炸物会带来重大风险.
- 评估受限聚合物结合爆炸物 (PBX) 的动态损伤行为对于提高安全性和实际应用至关重要.
- 开发更安全的PBX替代材料是关键的研究目标.
研究的目的:
- 开发一种更安全的聚合物结合糖 (PBS) 材料,作为PBX的替代品.
- 评估新型PBS材料的机械性能和动态损伤行为.
- 开发和验证一个构成模型来预测PBS在冲击下的行为.
主要方法:
- 使用新型聚合物制备聚合物结合糖 (PBS) 材料.
- 动态压缩试验用于评估机械性能和拉伸率影响.
- 低速度撞击实验,以调查动态损伤和负载转移.
- 为高应变率行为和在ABAQUS中实现模拟的构成模型的开发.
主要成果:
- PBS外的机械反应受到延展率的显著影响.
- 冲击实验揭示了PBS替代品的动态损伤和负载转移特征的洞察力.
- 模拟准确地预测了损伤演变过程,显示中心附近的初级损伤和滑动摩擦主导.
- 裂生长速度随着应力状态而变化,损伤向撞击表面下降.
结论:
- 开发的PBS材料作为PBX替代品提供了增强的实验安全性.
- 该研究成功地描述了PBS的动态机械行为和损伤机制.
- 经过验证的构成模型提供了一个可靠的工具,用于预测PBS在撞击场景中的行为,从而为更安全的爆炸材料设计做出贡献.
相关概念视频
01:19Impact 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,...
In cases of elastic deformation,...
196
01:21Plastic Behavior
196
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
196
01:13Impact Loading on a Cantilever Beam
387
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
387
01:24Stress-Strain Diagram - Brittle Materials
2.3K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
2.3K
01:16Dynamic Modulus of Elasticity of Concrete
315
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
315
01:19Members Made of Elastoplastic Material
97
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
97