Simulations of Fracture and Fragmentation of Geologic Materials using Combined FEM/DEM/SPH Analysis

Conference · Thu Apr 05 04:00:00 EDT 2007

OSTI ID:920474

Morris, J P; Johnson, S M

An overview of the Lawrence Discrete Element Code (LDEC) is presented, and results from a study investigating the effect of explosive and impact loading on geologic materials using the Livermore Distinct Element Code (LDEC) are detailed. LDEC was initially developed to simulate tunnels and other structures in jointed rock masses using large numbers of polyhedral blocks. Many geophysical applications, such as projectile penetration into rock, concrete targets, and boulder fields, require a combination of continuum and discrete methods in order to predict the formation and interaction of the fragments produced. In an effort to model this class of problems, LDEC now includes implementations of Cosserat point theory and cohesive elements. This approach directly simulates the transition from continuum to discontinuum behavior, thereby allowing for dynamic fracture within a combined finite element/discrete element framework. In addition, a Smooth Particle Hydrodynamics (SPH) capability has been incorporated into LDEC, permitting the simulation of fluid-structure interaction. We will present results from a study of detonation-induced fracture and fragmentation of geologic media surrounding a tunnel using LDEC.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 920474
• Report Number(s): UCRL-CONF-229812
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
CONCRETES
EXPLOSIVES
FLUID-STRUCTURE INTERACTIONS
FRACTURES
FRAGMENTATION
HYDRODYNAMICS
PROJECTILES
SIMULATION
TARGETS