NairnMPM

NairnMPM is the open-source code engine in this package for doing material point method (MPM) simulations. It is object-oriented C++ code that can run on many platforms. The main calculations are parallel code. You run calculations by creating Input Files for MPM Calculations. Once the calculations are done, you have a variety of options for visualizing and analyzing the output.

NairnMPM does 2D, axisymmetric, and 3D simulations with a wide range of material types. Some of its features are (click each link for details):

• Several options for particle update methods
• Several types of shape function including spline-based shaped functions
• Can implement method that approximates the inverse of the full mass matrix known as FMPM(k)
• Many material models including elastic, plastic, isotropic, anisotropic, viscoelastic, small strain, and large strain.
• Plasticity materials can use a variety of hardening laws.
• Softening materials to implement anisotropic damage mechanics (IsoPlasticity only).
• Simulations can include explicit cracks, do fracture mechanics calculations, and model crack propagation.
• Crack can include tractions laws to model cohesive zones, including dynamic cohesive zones in the wake of crack propagation.
• Cracks can add contact laws to model either frictional contact or an imperfect interface.
• Advanced multimaterial mode MPM with latest contact methods and contact laws to model material-material interactions as either frictional contact or an imperfect interface.
• Both 2D and 3D objects images can be directly converted to an MPM model.
• Advanced thermal calculations including thermal conductivity and accurate heat tracking to find internal energy, entropy, and Helmholz free energy.
• Coupled solvent diffusion calculations.
• Many archiving options along with global archiving and archiving to VTK Legacy files.
• Rigid particles for moving boundary conditions and special rigid-contact interactions.
• Many options for boundary conditions on the grid or on the particles (including tractions, heat fluxes, and concentration fluxes) and special grid conditions to create accurate symmetry planes.
• Several damping options
• Simulations in a gravitational field
• A method to deform shapes when adding particles to the grid and to deform the particles in those shapes. One common use is to have rigid particles conform to a shape that is not aligned with grid axes such as a cutting tool with various cutting angles.

Some planned features being investigated are:

• Custom Tasks for additional features