Structural Engineering and Mechanics

  • 제30권2호
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  • Pages.177-190
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  • 2008
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Simulation of material failure behavior under different loading rates using molecular dynamics

  • Kim, Kunhwi (School of Civil and Environmental Engineering, College of Engineering, Yonsei University) ;
  • Lim, Jihoon (School of Civil and Environmental Engineering, College of Engineering, Yonsei University) ;
  • Kim, Juwhan (School of Civil and Environmental Engineering, College of Engineering, Yonsei University) ;
  • Lim, Yun Mook (School of Civil and Environmental Engineering, College of Engineering, Yonsei University)
  • 투고 : 2007.09.15
  • 심사 : 2008.05.06
  • 발행 : 2008.09.30
⟨ 이전 논문 다음 논문 ⟩

초록

Material failure behavior is generally dependent on loading rate. Especially in brittle and quasi-brittle materials, rate dependent material behavior can be significant. Empirical formulations are often used to predict the rate dependency, but such methods depend on extensive experimental works and are limited by practical constraints of physical testing. Numerical simulation can be an effective means for extracting knowledge about rate dependent behavior and for complementing the results obtained by testing. In this paper, the failure behavior of a brittle material under different loading rates is simulated by molecular dynamics analysis. A notched specimen is modeled by sub-million particles with a normalization scheme. Lennard-Jones potential is used to describe the interparticle force. Numerical simulations are performed with six different loading rates in a direct tensile test, where the loading velocity is normalized to the ratio of the pseudo-sonic speed. As a consequence, dynamic features are achieved from the numerical experiments. Remarkable failure characteristics, such as crack surface interaction/crack arrest, branching, and void nucleation, vary in case of the six loading cases. These characteristics are interpreted by the energy concept approach. This study provides insight into the change in dynamic failure mechanism under different loading rates.

키워드

참고문헌

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