대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제34권5호
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  • Pages.511-518
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  • 2010
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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수치해석을 이용한 SHPB 시험의 마찰영향 분석과 보정에 대한 연구

Numerical Investigation of Frictional Effects and Compensation of Frictional Effects in Split Hopkinson Pressure Bar (SHPB) Test

  • 차성훈 (서울산업대학교 NID융합대학원) ;
  • 신현호 (강릉원주대학교 재료공학과) ;
  • 김종봉 (서울산업대학교 자동차공학과)
  • Cha, Sung-Hoon (Graduate School of NID Fusion Tech., Seoul Nat'l Univ. of Tech.) ;
  • Shin, Hyun-Ho (Dept. of Materials Engineering, Gangneung-Wonju Nat'l Univ.) ;
  • Kim, Jong-Bong (Dept. of Automotive Engineering, Seoul Nat'l Univ. of Tech.)
  • 투고 : 2009.02.25
  • 심사 : 2010.03.16
  • 발행 : 2010.05.01
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초록

SHPB시험은 입력봉과 출력봉 사이에 시편을 위치시키고 고속으로 변형하여 동적 응력-변형률 선도를 추출하는 것이다. 그렇기 때문에, 소재와 입력봉 사이 또는 소재와 출력봉 사이의 마찰이 측정되는 응력-변형률 선도에 영향을 주게 된다. 이것은 측정되는 응력이 유동응력이 아니고 축방향 응력이기 때문임을 확인 하였다. 본 연구에서는 측정되는 축방향 응력을 보정하여 정확한 유동응력을 구하기 위해 새로운 보정식을 제안하였다. 소재가 업셋팅 형태로 변형한다고 가정하고, 에너지 보존에 기초하여 보정식을 제안하였다. ABAQUS를 이용한 수치적 실험을 통해 마찰계수 0.3까지 보정한 결과 보정식이 유용함을 확인하였다.

The split Hopkinson pressure bar (SHPB) has been widely used to determine the mechanical properties of materials at high loading rates. However, to ensure test reliability, the source of measurement error must be identified and eliminated. During the experiment, specimens were placed between the incident and the transmit bar. Contact friction between the test bars and specimen may cause errors. In this study, numerical experiments were carried out to investigate the effect of friction on the test results. In the SHPB test, the stress measured by the transmitted bar is assumed to be the flow stress of the test specimen. However, performing numerical experiments, it was shown that the stress measured by the transmit bar is axial stress components. When the contact surface is frictionless, the flow stress and axial stress of the specimen are approximately equal. On the other hand, when the contact surface is not frictionless, the flow stress and axial stress are no longer equal. The effect of friction on the difference between the flow stress and axial stress was investigated.

키워드

참고문헌

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피인용 문헌

  1. A Numerical Investigation into the Tensile Split Hopkinson Pressure Bars Test for Sheet Metals vol.421, pp.1662-7482, 2013, https://doi.org/10.4028/www.scientific.net/AMM.421.464
  2. Measurement of a Nearly Friction-Free Stress–Strain Curve of Silicone Rubber up to a Large Strain in Compression Testing vol.58, pp.9, 2018, https://doi.org/10.1007/s11340-018-0426-z