Earticle

초록

영어

This study aims to design a Small Punch Test (SPT) apparatus for cryogenic environments using conduction cooling. SPT is a non-destructive testing method developed to evaluate material softening and embrittlement in applications such as power plants and fusion reactors. Compared to conventional tensile testing, SPT offers economic advantages in terms of miniaturization and repeatability. However, existing cryogenic SPT rely on liquid helium or evaporated helium gas, which involve high costs and inefficiency. In this study, a cryogenic cooling system utilizing a cryocooler was developed to eliminate the use of liquid helium, along with a rotary sample holder designed to enable testing of multiple specimens in a single cooling cycle. Key design considerations included minimizing external heat intrusion, optimizing thermal management of the load application structure, designing flexible copper connectors suitable for rotation, and applying multilayer insulation (MLI) to reduce radiative heat loads. In particular, the conduction cooling path was optimized to ensure that the specimen temperature could be stably maintained below 20 K, while minimizing displacement in the load application structure and enhancing thermal stability tailored to the characteristics of SPT. The proposed testing apparatus significantly improves cost efficiency and testing productivity compared to existing systems, and it is expected to set a new standard for material property evaluation in cryogenic environments.

목차

Abstract
1. INTRODUCTION
2. EXPERIMENTAL APPARATUS DESIGN
2.1. Design and Structure of Small Punch Tester with Conduction Cooling
2.2. Internal Structure of the Test Cryostat
2.3. Thermal Design of the Tester Cryostat
3. THERMAL ANALYSIS OF SPT UTILIZING CONDUCTION COOLING METHOD
3.1. Temperature Distribution and Thermal Load Optimization Results
3.2. Variable Temperature Control for Specimen Testing
4. CONCLUSION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Seungcheol Ryu [ Smart Manufacturing Engineering, Changwon National University, Republic of Korea ]
• Yubin Kim [ Smart Manufacturing Engineering, Changwon National University, Republic of Korea ]
• Seunggun Lee [ Department of Hydrogen Materials Evaluation, Extreme Materials Institute Korea Institute of Materials Science, Republic of Korea ]
• Seokho Kim [ Mechanical Engineering, Changwon National University, Republic of Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537