Study of sealing effect about the Shape Memory Alloy-based Knife-edge Seal System in extraterrestrial soil sample return mission

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-09-11 DOI:10.1016/j.vacuum.2025.114731

Jin Wang , Ruguang Zhang , Wenfeng Li , Yongjun Wang , Ming Hao , Kun Liu , Yuanhua Xie , Huzhong Zhang , Chengdan He , Yan Zhang , Detian Li , Zhenlin Wang

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引用次数: 0

Abstract

Deep space exploration missions critically require reliable sealing system for extraterrestrial sample containment and return. This study presents a Shape Memory Alloy-based Knife-edge Seal System (SMAKSS) designed specifically for this demanding application. Through an integrated approach combining numerical modeling and experimental validation, we systematically investigated the system's sealing performance. A thermo-mechanical finite element model is developed in COMSOL Multiphysics to simulate the Shape Memory Alloy (SMA) ring's thermally-induced contraction behavior and stress distribution during sealing. Moreover, the experiment investigates trends in both leakage rates and knife-edge penetration depths in SMAKSS systems with four different blade angles and tip radius under increasing heating temperatures. Experimental results demonstrate that the configuration with a 45° blade angle and a 0.1 mm tip radius achieves the deepest penetration depth and generates the highest compressive stress, achieving a minimal leakage rate of 3.53 × 10⁻¹¹ Pa m³/s at a heating temperature of 150 °C. This leakage rate meets the stringent sealing requirements for extraterrestrial sample containment, establishing SMAKSS as a promising solution for planetary exploration applications.

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形状记忆合金刀口密封系统在地外土壤样品返回任务中的密封效果研究

深空探测任务迫切需要可靠的密封系统来容纳和返回地外样本。本研究提出了一种基于形状记忆合金的刀口密封系统（SMAKSS），专为这种要求苛刻的应用而设计。通过数值模拟和实验验证相结合的方法，系统地研究了该系统的密封性能。在COMSOL Multiphysics中开发了一个热力学有限元模型，模拟形状记忆合金（SMA）环在密封过程中的热致收缩行为和应力分布。此外，实验还研究了四种不同叶片角度和叶尖半径的SMAKSS系统在增加加热温度下泄漏率和刀口穿透深度的变化趋势。实验结果表明，在加热温度为150℃时，45°叶片角、0.1 mm叶尖半径的侵彻深度最深，产生的压应力最大，泄漏率最小，为3.53 × 10−11 Pa m3/s。这种泄漏率符合严格的地外样品密封要求，使SMAKSS成为行星探测应用的有前途的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.