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31.4.2 Creating a VCCT crack for Abaqus/Standard You can create a virtual crack closure technique (VCCT) crack that can be analyzed by Abaqus/Standard by doing the following: • Create a contact interaction property that specifies the fracture criterion. The fracture criterion interaction property specifies the criterion for crack propagation along initially partially bonded surfaces. You can choose between the following crack propagation criteria: • The virtual crack closure technique ( VCCT) criterion, which uses the principles of linear elastic fracture mechanics. For more information, see.

• The enhanced virtual crack closure technique ( Enhanced VCCT) criterion, in which you can control the onset and growth of a crack using two different critical fracture energy release rates. The enhanced virtual crack closure technique is available only in an Abaqus/Standard analysis. For more information, see. • Create a surface-to-surface contact interaction that models the potential crack surfaces using master and slave contact surfaces. The initially bonded region defines a region of the slave surface that is initially bonded with the master surface. The unbonded portion of the slave surface behaves as a regular contact surface. For detailed information, see.

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• Activate the crack propagation capability to specify that crack propagation can occur between the two surfaces that are initially partially bonded. The crack continues to propagate along the interface between the master and slave surfaces. The virtual crack closure technique cannot model crack initiation from a surface that is not already cracked; therefore, you must specify a clearance between the slave and master surfaces that models a preexisting flaw at the beginning of the crack surface. For more information, see.

• Select the step in which the crack propagation is initiated. • Select the surface-to-surface contact interaction that specifies the master and slave surfaces. Bontempi keyboard pm 747 driver download fastershire. • Specify how the traction between the surfaces defined in the contact pair interaction is released after debonding occurs: • Choose Step (default) to release the traction during the increment that follows debonding. • To avoid a sudden loss of stability, choose Ramp to release the traction gradually during succeeding increments that follow debonding. • You can specify the rate at which crack propagation information is written to the data (.dat) file. If the step is using automatic time incrementation, the value is the suggested time increment to use for the first increment just after debonding starts. If the step is using fixed time incrementation, the value is the time increment after debonding starts if Abaqus/Standard finds it needs a smaller time increment than its current value.

The time increment size will be modified as required until debonding is complete. • Click OK to configure the VCCT crack and to close the editor. • If desired, edit the general solutions control and adjust the VCCT Linear Scaling to accelerate convergence. For most crack propagation simulations using VCCT or the enhanced VCCT criterion, the deformation can be nearly linear up to the point of the onset of crack growth; past this point the analysis becomes very nonlinear. In this case linear scaling can be used to effectively reduce the solution time to reach the onset of crack growth. For more information, see.

For information on related topics, click any of the following items: • ” •.

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