相关实验视频
Updated: Jul 18, 2025

05:04
Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
2.3K
对NEPE推进剂粒的结构完整性评估,考虑到其机械性质的压力-压缩不对称性
Pengjun Zhang1, Wangshen Han1, Dongmo Zhou1
1School of Mechatronic Engineering, North University of China, Taiyuan 030051, China.
Polymers
|August 26, 2023
概括
酸乙烯塑化聚乙烯 (NEPE) 推进剂粒的机械性能表现出张力-压缩不对称性. 这种不对称性影响结构完整性的评估,揭示了传统方法是保守的,并高估了风险.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 航空航天工程 航空航天工程
背景情况:
- 推进剂颗粒是火箭和弹药中的关键部件.
- 了解它们在压力下的机械行为对于安全和性能至关重要.
- 酸乙烯塑化聚乙烯 (NEPE) 推进剂被广泛使用,但其复杂的机械性能需要详细的研究.
研究的目的:
- 研究NEPE推进剂机械性能中张力-压缩不对称性对粒度结构完整性的影响.
- 开发一种新的方法来评估NEPE推进剂颗粒的结构完整性.
- 为了评估NEPE推进剂颗粒在联合轴向和横向过载下的结构完整性.
主要方法:
- 在张力和压缩下为NEPE推进剂建立了统一的构成方程.
- 开发了一种用于推进剂颗粒结构完整性评估的新方法.
- 在联合轴向和横向过载下评估NEPE推进剂颗粒完整性.
主要成果:
- 在NEPE推进剂颗粒中的机械状态是压力和压缩在联合过载下共存的状态.
- 张力和压缩区域独立于推进剂的构成性行为.
- 张力-压缩不对称性影响机械反应,最大等效应力和应变力在纯张力和压缩模型之间.
结论:
- NEPE推进剂机械性能的张力-压缩不对称性会影响其机械反应.
- 考虑到不对称性计算的安全系数高于忽略它时的安全系数,这表明传统方法是保守的.
- 拟议的评估方法提供了NEPE推进剂颗粒结构完整性的更准确的评估.
相关概念视频
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
290
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
290
Bending of Members Made of Several Materials
223
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
223
Normal Strain under Axial Loading
560
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
560
Plastic Deformations of Members with a Single Plane of Symmetry
109
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
109
Symmetric Member in Bending
247
In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
247
Eccentric Axial Loading in a Plane of Symmetry
220
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
220

