General Information
Summary of
LUSAS analysis features
Last updated: 09 March 2023
The following summarises the
analysis features available in the range of LUSAS finite element
software products and additional software product options for Version
17.0
Note: For detailed information relating
to each LUSAS software product click here
General System
Facilities
- Online help
- Comprehensive error diagnostics
- User defined element and nodal
output options
- Full range of load types
- General purpose load curve input
- Generalised constraint equations
- Resolution for multiple load cases
- Flexible restart facility
- Superelements (substructures)
- Efficient automatic frontwidth
optimisation
- Efficient frontal equation solver
for both large and small problems
- Pre-conditioned conjugate gradient
iterative solver for fast solutions of large problems
General
Analysis Capabilities
- Solve multiple analyses in one model
- Solve selected analyses/loadcases
- Cable tuning analysis for linear
structures (selected products only)
- Specify target values for linear
structures
- Direct method influence analysis
- Reciprocal method influence analysis
- Nonlinear analysis
- Dynamic analysis
- Thermal analysis
- Heat of Hydration analysis
- Coupled analysis
Verification
- Rigorous internal Quality Assurance
procedures
- Comprehensive machine checked
testing
- HECB calibration and NAFEMS
calibration tests
Implicit
Stress Element Types
- Plane frame/truss
- Grillage
- Space frame/truss
- Curved thin and thick beams with
constant/variable cross sections
- Plane stress/plane strain
- Plate flexure (thin and thick)
- Ribbed plates
- Axisymmetric solids with non
axisymmetric loading
- Axisymmetric membranes
- Axisymmetric thin shell
- Flat thin shells
- Curved thin Semiloof shells
- Flat/curved thin/thick co-rotational
shells
- 3D solids
- Composite shell
- Composite solids
- Generalised joint/gaps including
seismic isolators, viscous dampers, lead rubber bearings and
friction pendulum
- 2D plane stress/plane strain/
axisymmetric solid crack tip
- Pore water pressure modelling (Plane
strain only)
Explicit
Stress Element Types
- Plane stress/strain with hourglass
stabilisation
- Solid with hour glass stabilisation
Thermal (Field)
Element Types
- Bars
- Plane
- Axisymmetric solids
- Axisymmetric membranes
- 3D solids
- Links
Solvers
- Frontal (direct) solver
- Iterative (PCG) solver
- Fast multifrontal direct solver
- Fast multifrontal block Lanczos
eigensolver
- Fast complex eigensolver
- Fast Parallel Direct Solver
- Fast Parallel Iterative Solver
Linear
Materials
- Isotropic, orthotropic, anisotropic
and rigidity models
- Isotropic and orthotropic thermal
materials
- Composite lay-ups for shell and
solid material models
- Temperature dependency for all
linear material models
- Piecewise linear joint material
model
- Piecewise linear (axial force
dependent) joint material model
- Piecewise linear bar material model
- Trilinear earth pressure joint
material
- Piecewise linear hysteretic and
compound hysteretic joint models
- Duncan-Chang model
Nonlinear
Materials
- Plasticity model with isotropic and
kinematic hardening using von-Mises criteria, includes a backward
Euler stress update algorithm with consistent tangents
- Anisotropic plasticity model with
isotropic hardening using Hill or Hoffman criteria, includes a
backward Euler stress update algorithm with consistent tangent
- Plasticity model with isotropic
hardening using a modified von Mises criteria with different
properties in tension and compression, includes a backward Euler
stress update algorithm with consistent tangent
- Concrete models with opening and
closing cracks and strain softening based on fracture energy in 2D
and 3D
- Concrete
creep and shrinkage model to CEB-FIP Model Code 1990, and EN1992-1-1:2004
- Concrete
creep to China code
- Concrete
heat of hydration modelling
- Multi-surface
cracking concrete with crushing material model
- Viscous damped joints
- Drucker-Prager model
- Geotechnical model using Mohr
Coulomb criteria including non-associative flow for soils and
rocks
- Modified Mohr-Coulomb material model
with tensile/compressive cut-off.
- Volumetric deformation model for
soils and crushable foams
- Two phase material
- Geostatic control
- Ko Initialisation
- Ogden and Mooney-Rivlin models for
rubber materials with very large strains
- Composite lay-ups for shell and
solid nonlinear material models
- Temperature dependency for all
nonlinear material models
- Creep model with time dependency and
strain hardening
- Viscoelasticity
- User defined nonlinear material and
creep interfaces
- Damage model
- Hashin material model for composite
materials
- Material model interface (MMI)
Eigen Analysis
- Lanczos and Subspace EigenSolver
- Frequency bracketing
- Euler buckling analysis
- Guyan reduction with automatic or
user defined masters
Nonlinear
Analysis
- Incremental solutions with iterative
correction
- User defined combination of full or
modified Newton Raphson iterations with line searches
- Automatic arc length solution
procedures with option for non-proportional loading
- Automatic recovery upon convergence
failure
- Load or displacement control
- Wide selection of convergence
criteria
- Large deformation, large rotation
geometric nonlinearities
- Large strains
- Follower loads
- Element birth and death facility
- Centripetal stress stiffening
- Temperature dependent material
properties
Dynamic
Analysis
- Forced response analysis
- Modal (viscous or structural) or
Rayleigh damping
- Response spectrum analysis with a
choice of SRSS and CQC spectral combinations
- Modal synthesis analysis using
superelements
- Implicit transient dynamic analysis
using Hilber-Hughes-Taylor time integration scheme
- Explicit transient dynamic analysis
using central difference time integration scheme
- Initial velocity/acceleration input
- Implicit and explicit impact
- Linear and nonlinear dynamic
analysis
- Automatic time step selection
- Time dependent material properties
- Time dependent loading
- Interactive
Model Dynamics option for multiple loading events and advanced
loading options
Thermal
Analysis
- Steady state heat
conduction/convection/radiation
- Transient thermal analysis with a
general two point recurrence scheme
- Temperature dependent thermal
properties
- Temperature dependent nonlinear heat
conduction/convection/radiation
- Variable time step selection
- Conduction/convection/gap radiation
- Diffuse radiation using view factor
with option to account for symmetry boundary conditions
- Full and semi thermal-structural
coupling
Boundary
Conditions
- Choice of restrained, prescribed or
spring boundary conditions
- Transformed freedom option for skew
boundary conditions
- Time dependent boundary conditions
and loading
- Nonlinear friction and gap models to
represent deformation dependent boundary conditions and contact
problems
- Slideline/slidesurface contact
algorithms for use with implicit/explicit plane stress/strain,
Axisymmetric, shell and solid elements
- Convection and nonlinear radiation
boundary conditions
- Tied slidelines to connect
incompatible meshes
- Contact cushioning
- Automatic pre-contact algorithm
- Curved surface contact
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