This paper reports the development of upgraded strain energy frame impact machine (SEFIM) with larger and faster impact capacity. The impact load capacity of SEFIM was improved by applying a 200 tonf hydraulic jack while the impact velocity was significantly increased by reducing the diameter of energy frame and by applying different materials in the energy frame. In addition, the length of transmitter bar was increased to capture pure material response by avoiding the influence of reflected stress wave in the transmitter bar. Experimental test results showed the faster strain rate (186 /sec) than that (10-40 /sec) of previous SEFIM.

• 김동주(세종대학교 건설환경공학과 부교수, 공학박사) | Kim, Dong Joo 교신저자
• 박준길(세종대학교 건설환경공학과, 석사과정) | Park, Jun Kil
• 박승훈(세종대학교 건설환경공학과, 박사과정) | Park, Seung Hun