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1. #Flac3d units constituitive model how to
2. #Flac3d units constituitive model full
3. #Flac3d units constituitive model code

Itasca’s User-Defined Constitutive Model Library ( Itasca UDM Library) provides a collection of selected user-defined models (UDMs) for Itasca continuum software, including FLAC3D.

#Flac3d units constituitive model how to

This means that they are all available for use as examples of how to implement specific behavior, or to serve as a basis for alteration or extension.

#Flac3d units constituitive model code

The source code used for most of these models is provided as part of the installation. Built-in Constitutive ModelsįLAC3D's built-in constitutive models include 26 mechanical, nine creep, and one special hydration model. The properties of a constitutive model are saved automatically, but arbitrary data associated with each instance may also be saved and restored with the model. State variables and properties are stored separately for each zone. The conversions to effective and corotational stress increment in the constitutive models are conducted by FLAC3D internally.Įach constitutive model instance is specific to a single zone. FLAC3D is robust in the sense that it can handle any constitutive model with no adjustment to the solution algorithm.Īll models in FLAC3D operate on effective stresses only, and all stress increments in the constitutive model are corotational. Explicit schemes can follow arbitrary path-dependent behavior in stress/strain laws in almost the same computer time as path-independent laws. No stress/strain matrix is needed-the constitutive relations are used directly.

If necessary, a correction is made to the trial stress in order to determine the actual stress state. Often models calculate a perfectly elastic trial stress and then compare the results against whatever nonlinear criteria are being considered. Given the stress state at time t, and the total strain increment for a timestep, Δt, the purpose is to determine the corresponding stress increment and the new stress state at time t + Δt. Explicit Scheme and Incremental FormulationįLAC3D uses an explicit, incremental formulation for constitutive models.

#Flac3d units constituitive model full

The material here provides an overview and highlights full reference documentation is available in the FLAC3D Help. Note that while there is no restriction on the creation of models, solving a model larger than 600 zones that uses a constitutive model plugin requires the Plugin Option. This page details the advantages of using FLAC3D to create custom material behavior, and gives a simple example of the process required. They are treated exactly like one of the program's built-in constitutive models.

These models are compiled using the C++ programming language into plugins that can be loaded into FLAC3D on startup. FLAC3D includes the ability to create your own customized material behavior via user-defined constitutive models.