Abstract
This work investigates dynamic failure processes in homogeneous and functionally graded materials (FGMs). The failure criterion is incorporated in the cohesive zone model (CZM) using both a finite cohesive strength and work to fracture in the material description. A novel CZM for FGMs is explored and incorporated into a finite element framework. The material gradation is approximated at the element level using a graded element formulation. Examples are provided to verify the numerical approach, and to investigate the influence of material gradation on crack initiation and propagation in Mode-I as well as in mixed-mode fracture problems. The examples include spontaneous rapid crack growth in homogeneous and FGM strips, dynamic crack propagation in actual monolithic and epoxy/glass FGM beams (three-point bending) under impact loading, and mixed-mode crack propagation in pre-cracked steel and graded plates.
Original language | English (US) |
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Pages (from-to) | 1195-1254 |
Number of pages | 60 |
Journal | International Journal of Plasticity |
Volume | 21 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2005 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering
Keywords
- Dynamics
- Finite element method
- Functionally graded material
- Graded composites
- Graded finite element
- Intrinsic cohesive zone model
- Mixed-mode fracture