In this paper, the changes of the uniaxial tensile mechanical properties of the ETFE film after the uniaxial pre-stretching stress exceeds the first yield stress and the second yield stress was investigated. The ETFE film is first pre-stretched uniaxially along the MD direction or TD direction. After the pre-stretching loading stress exceeds the first yield stress and the second yield stress to cause the ETFE film to undergo plastic deformation, rectangular uniaxial tensile specimens are cut from the pre-stretched film along the MD direction and the TD direction for subsequent uniaxial tensile tests, thereby determining the uniaxial tensile mechanical property parameters of the ETFE film after uniaxial pre-stretching, including yield stress, tensile strength and elongation at break, and discussing the changes in its uniaxial tensile mechanical properties.

Abstract
1. 서론
2. 일축 사전인장의 변형률 결정
3. 일축 사전인장 필름의 제작 및 일축인장시험
    3.1 일축 사전인장 시험체 및 사전인장 장치
    3.2 일축 사전인장 필름의 제작 방식
    3.3 일축 인장시험
4. 일축 인장 필름의 역학적 특성
    4.1 일축 인장시험 결과
    4.2 일축 인장에 대한 역학적 특성 분석
5. 요약 및 결론
감사의 글
References

• 전상현(지원이엔지 대표, 공학박사) | Jeon Sang-Hyeon
• 김재열(협성학교 건축공학과 교수, 공학박사) | Kim Jae-Yeol (Professor, Ph.D, Department of Architectural Engineering, Hyupsung University) Corresponding author
• 심천보(협성학교 건축공학과 연구원, 공학석사) | Shim Chun-Bo (Dept. of Architectural Eng., Hyupsung University)