A VCCT-based crack growth simulation uses:
- Interface elements INTER202 (2-D) and INTER205 (3-D).
- The CINT command to calculate the energy-release rate.
- The CGROW command to define the crack growth set, fracture criterion, crack growth path, and
solution control parameters.
12.1.1. VCCT Crack Growth Simulation Process
A VCCT-based crack growth simulation is assumed to be quasi-static. Following is the general process
for performing the simulation:
12.1.1.1. Step 1. Create a Finite Element Model with a Predefined Crack Path
12.1.1.2. Step 2. Perform the Energy-Release Rate Calculation
12.1.1.3. Step 3. Perform the Crack Growth Calculation
12.1.1.4. Example: Crack Growth Set DefinitionCrack growth simulation is a nonlinear structural analysis. The analysis details presented here emphasize
features specific to crack growth.
12.1.1.1. Step 1. Create a Finite Element Model with a Predefined Crack Path
Standard nonlinear solution procedures apply for creating a finite element model with proper solution-
control settings, loadings and boundary conditions.
The predefined crack path is discretized with interface elements and grouped as an element component,
as shown in the following figure:
Figure 12.1: Crack Path Discretized with Interface Elements
The interface elements can be meshed via CZMESH or meshed by a third-party tool that generat es in-
terface elements.
The element MPC constraint option (KEYOPT(2) = 1) bonds the potential crack faces together before
cracks begin to grow. The MPC constraints are subsequently released when the fracture criterion is met,
thus growing the cracks.
In a 2-D problem, one interface element behind the crack tip may open if it meets the fracture criterion
at a given substep. In a 3-D problem,all interface elements behind the crack front may open if they
meet the fracture criterion.
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