在各种负载条件下,对具有内部空洞的固体推进剂的故障模式进行数值模拟
Kai Liu1,2, Qingchun Yang3, Liang Cao4
1National Graduate College for Elite Engineers, Beihang University, Beijing 100191, China.
Polymers
|February 13, 2026
概括
基终结聚乙烯 (HTPB) 推进剂的内部空隙危及固体火箭发动机的安全性. 这项研究模拟了HTPB推进剂的行为,揭示了空腔大小和工程参数如何影响故障模式,增强结构完整性和安全性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 航空航天工程 航空航天工程
背景情况:
- 固体火箭发动机的可靠性取决于推进剂的结构完整性.
- 基终结聚乙烯 (HTPB) 推进剂中的内部空洞降低了机械性能,并构成安全风险.
- 了解空腔效应对于推进剂设计和发动机安全至关重要.
研究的目的:
- 开发和验证一个包含损坏的HTPB推进剂的组成模型.
- 以数值研究初始模量,冲击速率和限制压力对具有内部空洞的推进剂故障模式的影响.
- 建立一个基础,优化推进剂的结构安全性关于空腔大小和工程参数.
主要方法:
- 使用通用增量压力-应变损伤模型 (GISSMO) 开发了一种HTPB推进剂的构成模型.
- 通过在各种拉伸速率下进行单轴拉伸试验验证实模型的有效性.
- 在不同的条件下,进行数值模拟来分析具有空洞 (40-100毫米半径) 的推进剂的故障机制.
主要成果:
- 经验证的模型准确地预测了力位移曲线,并捕获了取决于速率的材料行为 (弹性-塑料到弹性).
- 大型腔 (80-100毫米) 导致应力度,内壁损伤,挤出,崩和潜在的骨折.
- 较小的腔 (40-60毫米) 显示出更大的稳定性,损伤主要局限于体积压缩.
结论:
- 初始模量显著影响损伤的传播;较高的模量 (>24 MPa) 抑制了大腔的损伤.
- 撞击下的空洞行为随着速度和限制压力而变化,影响结构稳定性和损伤定位.
- 优化与腔体大小相关的工程参数是提高推进剂结构安全性的关键.
更多相关视频
06:52Laboratory Scale Slow Cook-Off Testing of Rocket Propellants: The Combustion Rate Analysis of a Slowly Heated Propellant CRASH-P Test
Published on: February 6, 2021
4.4K
10:49Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
Published on: March 6, 2014
17.9K
相关概念视频
01:28Internal Loadings in Structural Members: Problem Solving
1.7K
When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
1.7K
01:15Stress: General Loading Conditions
600
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
600
02:22Structures of Solids
18.6K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
18.6K
02:37Metallic Solids
20.9K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.9K
01:24Numerical Calculations
1.2K
In engineering applications, the representation of the numerical value is critical. Presenting or reporting the answer is one of the essential parts of engineering practices. Numerical calculations are performed using handheld calculators or computers since numerically accurate answers are always preferred.
The solution to a problem is obtained using different methods. While manually solving algebraic symbols is one of the most common methods, the graphical method is often preferred. Computers...
The solution to a problem is obtained using different methods. While manually solving algebraic symbols is one of the most common methods, the graphical method is often preferred. Computers...
1.2K
01:07What is a Mode?
26.6K
The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
26.6K