LS-DYNA를 이용한 금속 및 암석 재료의 파괴인성시험 모델링 = Modeling of Fracture Toughness Test Procedures for Metal and Rock Materials using LS-DYNA

다국어 초록 (Multilingual Abstract)

In this study, two fracture toughness test procedures are modelled for selected metal and rock on LS-DYNA, which is a commercial finite element code. The tests are conducted by using the 3-point bend test procedure for rectangular bar specimen. Because it takes a relatively long time to conduct the test, the implicit solver based on the Newmark method is adopted for the analyses. The values of stress intensity factor obtained from the analyses are 73 and 0.3 MPa.m^0.5 for the metal and rock material, respectively. It can be thought that the resulting small value of the fracture toughness of the rock material model well represents the brittleness of rock material.

참고문헌 (Reference)

1 김엄기, "재료강도시험법" 두양사 139-154, 2007

2 윤지선, "암석. 암반의 조사와 시험" 구미서관 579-587, 1991

3 LSTC, "LS-DYNA Keyword User’s Manual"

4 Hertzberg, R.W., "Deformation and Fracture Mechanics of Engineering Materials" John Wiley & Sons, Inc 2013

5 Li, H., "A dynamic material model for rock materials under conditions of high confining pressures and high strain rates" 89 : 38-48, 2016

6 Holmquist, T. J., "A computational constitutive model for concrete subjected to large strains, high strain rates, and high pressures" 591-600, 1993