机械合规性增强了玻璃聚合物薄膜的冲动能量吸收
Jonathan G Raybin1, Katherine M Evans1, Edwin P Chan1
1Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.
概括
较薄的聚甲酸 (PMMA) 薄膜在极端应变率下由于增加了机械合规性而表现出增强的能量吸收. 这种合规性促进了塑料变形,改善了先进材料设计的抗冲击性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 聚合物物理 聚合物物理
背景情况:
- 机械合规对于自然和工程系统中的能量消耗至关重要.
- 了解在极端应变速率下的合规性比在准静态条件下更少被探索.
研究的目的:
- 为了研究聚甲基酸 (PMMA) 薄膜在高拉伸率下的动态反应.
- 探索机械合规在能量吸收和故障机制中的作用.
主要方法:
- 基于激光剥离的膜扩张测试.
- 超高速成像用于实时动态响应捕获.
- 机械建模分析变形和能量吸收.
主要成果:
- 在冲动负载下,PMMA膜表现出意想不到的大双轴应力耐受性.
- 更薄的薄膜显示出更高的合规性,导致增强的塑料变形和能量吸收.
- 材料厚度是调整抗冲击能力的一个关键因素.
结论:
- 机械合规性显著提高了PMMA在极端应变速率下的能量吸收.
- 调膜厚度为设计更坚固的材料提供了一种策略,以减轻冲击.
- 结果为开发用于高动态负载应用的先进材料提供了洞察力.
相关概念视频
01:21Plastic Behavior
645
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...
645
01:21Polymer Classification: Crystallinity
4.1K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
4.1K