LS DYNA - A Simulation Training with Practical Applications

Learn the basics of finite element analysis, a numerical method for solving boundary value problems by discretizing geometry into a node mesh, covering pre-processing steps, loads, constraints, solving, and post-processing.

Explore linear static, nonlinear, dynamic, buckling, thermal, fatigue, optimization, CFD, crash, and noise, vibration, and harshness analyses in Abeka software for practical finite element applications.

Explore the basics of stresses and strains, including direct stress, Poisson's ratio, stress units (MPa, kPa, GPa), strain, Hooke's law, Young's modulus, and simple tensile test with the stress–strain diagram.

Explore von Mises stress and the distortion energy theory, compare it to yield stress from a simple tensile test, and assess safety using the factor of safety for ductile materials.

Explore 1d, 2d, and 3d element types in ls dyna, including bar, beam, rod, tri, quad, tetra, penta, and hexa. Learn how cross-sections, midside nodes, and special elements influence accuracy.

Explore constraint types and conditions, including fixed supports, bolts, and pin or roller supports. Learn how these constraints produce reaction forces on X, Y, and Z axes in hyper mesh.

simulate a ball hitting a plate using defined geometry, mesh, and material properties. apply loads, boundary conditions, and contact to perform the analysis step-by-step.

Mesh a plate and a solid spherical ball in LSP Post, define coordinates and mesh size, assign IDs, set ball center at (0,0,5) with radius 5, and save the project.

Develop ball-plate impact model by defining plate and ball materials with piecewise linear plasticity, setting densities and moduli, converting units, and applying fixed boundaries with a 10 m/s ball velocity.

Apply boundary conditions to the plate and ball, fix the plate with single-point constraints, and set a 10 m/s velocity with automatic surface-to-surface contact between master ball and slave plate.

Define the analysis setup with time interval and output steps, plot stress and displacement, and configure energy cards for global state and internal energy before running the model check.

Examine bomblet and ball-plate impact results in LS-DYNA by loading the results file, viewing time-step states, and analyzing stress, displacement, and energy changes with animation and velocity vectors.

Download and install a free textpad editor, open the project files, and edit parameters directly in the text file to adjust termination time and other settings.

Identify key ls-dyna file formats, including the keyword input file, the dot out plus plot and message files, and understand how each stores parameters, materials, time, and solution steps.

We explore a linear static analysis of a bolted aluminium bracket at four locations under a 10 megabytes pressure, using an explicit dynamic solver with a time-dependent load.

Import the bracket model, set units to meters, and generate a mixed mesh. Define aluminium material properties and fix the hole boundary for the subsequent load steps.

Perform a static ls-dyna analysis by applying a time-dependent pressure load on the top surface using a load curve, while defining a shell with 0.02 thickness and aluminum material.

View static analysis results from an explicit dynamics simulation, play the animation, and observe stress distribution and its maxima, displacement, and internal energy as the load increases.

Learn to build and edit finite element meshes in LS-DYNA shape mesher using shape measure, creating box and cylinder geometries, setting coordinates and element counts for accurate FEM assemblies.

Learn shell meshing and surface meshing in LS-DYNA with automation. Create services, define surface dimensions, generate and refine meshes, and manage element types, connections, and higher-order options.

Explore solid enmeshing and two meshing types—hecks smushing and hex messaging—for simple and complex parts, with cylinder creation and automatic meshing plus element editing.

Learn to use mesh edit tools to identify nodes and elements, filter by type, hide or unhide elements, and translate or measure distance, area, and volume.

Explore the diverse ls-dyna element types, from shell and solid to beam and particle, and learn when to use reduced versus full integration for accurate simulations.

Explore the LS-DYNA material library, covering more than 200 material models across linear elastic, nonlinear elastic, plastic, and foam categories, with guidance to manuals and online references.

Explore LS-DYNA driven crash box analysis for automotive safety, showing how a front bumper crumbles to absorb impact energy, protecting occupants with octagon profile designs.

Continue with the basic fundamentals of the crash box using a glass-box experiment. The setup uses a top-loading assembly, a moving wall at 10 m/s, nonlinear steel, and Kopell-Simon deformation.

Import the geometry from the l'est dyna file, refine the mesh through element editing, and define material properties including density, Young's modulus, Poisson's ratio, and plasticity for the crash box.

Define the crash box section properties with shell elements and thicknesses, set boundary conditions and model a moving digital wall at 10 m/s to simulate a crash scenario.

Set up automatic contacts between bumper, rigid wall, and glass box, define friction (static and dynamic 0.2) and establish node and element sets for left and right faces.

Define properties and assign material and section IDs to each crash box component, set termination at 30 microseconds, generate 1 microsecond time-history data, then save and run the LS-DYNA model.

View the crash box simulation results, showing crumbling under load, measured stress and displacement, and energy shifts from kinetic to internal energy as the load evolves.

Differentiate static versus dynamic analysis in finite element software, covering linear and nonlinear regimes. Explore dynamic categories from free and forced vibration to normal mode, transient, and spectrum analyses.

Explore linear static analysis, the linear force-displacement relation under time-invariant loading, and the quasi static approach that uses elastic behavior up to the proportional limit.

Explore non-linear analysis in finite element methods, including material non-linearity from plasticity, geometric non-linearity from large deformations, and boundary or contact non-linearity, with true versus engineering stress and strain concepts.

Explain material non-linearity, geometric non-linearity, and boundary or contact non-linearity, highlighting plasticity and elasticity, tensile testing, yield point, ultimate strength, infector point, and tangential modulus.

Compare implicit and explicit analysis in structural dynamics, including static versus dynamic and linear versus nonlinear. Explain when implicit Newton-Raphson convergence applies and when explicit time integration suits dynamic contact.

Perform a three point bending test on a standard specimen by applying a midspan force between supports to determine bending strength. Measure deflection and calculate bending stress and breaking force.

Explore a three-point bending test on a corrugated plate using the Adlerstein software. Define boundary conditions, material properties, and a 45 mm vertical displacement to analyze bending strength.

Set up a three point bending test in Celestina by defining a piecewise linear plastic steel material, naming the plate shell, and assigning the material and section to the part.

This lecture defines boundary conditions for a 3 point bending test, fixing ends, restricting motion to vertical downward, and creating a time–displacement curve to drive the model.

Define automatic single contact with a friction coefficient of 0.2 for a three point bending test in LS-DYNA, set termination time to 0.01 and 50 steps.

View post-processing results of a 3 point bending test simulation, identify maximum stress and displacement, observe deformation, and preview adaptive meshing.

Explore adaptive meshing in a three point bending test, showing automatic mesh density adjustments in critical stress regions to improve accuracy in implicit dynamic problems while reducing manual remeshing time.

Walks through enabling adaptive meshing in a 3-point bending test with LS-DYNA, configuring adaptive frequency, tolerances, option, and node stress outputs before running the analysis.

View adaptive mesh results of a 3 point bending test in LS-DYNA by loading a binary data plot, applying adaptive matching, and plotting effective stress for selected nodes.