Determine the undamped natural mode shapes and frequencies of structures. Once you perform this normal mode analysis, you can explore and resolve problems with noise and vibration.
Random Vibration Fatigue
Up to 70-80% of all mechanical failures are the result of fatigue in service, due to a cyclic load with a magnitude lower than their design load. The fatigue capability in Autodesk Nastran lets you test the durability of a part under repeated loading. Fatigue is especially important for rotating machine components and aircraft structures, which repeatedly undergo long periods of vibration.
The random vibration fatigue—or spectral fatigue assessment—feature lets you simulate vibration shake tests. This type of testing is particularly applicable to dynamic analyses with random inputs, such as:
Pre-Stress Normal Modes
Loading on a structure can affect the natural frequency of the system, similar to the way that tightening a guitar string increases its natural frequency. Simulate the preloaded structure with a pre-stress normal modes analysis. A preload can have a significant effect on the system’s natural frequencies and mode shapes for such structures as pressurised tanks rotating machinery. Induce an initial stress state on structures, such as rotor blades or taut strings.
Simulation Mechanical, Autodesk Nastran In-CAD Integration
Autodesk Nastran is the FEA engine for Autodesk Nastran In-CAD software and Simulation Mechanical software. Use its advanced mechanical simulation solving capabilities for Autodesk mechanical simulation software products.
Autodesk Nastran Editor
Get greater control over FEA models and results. Autodesk Nastran offers advanced editing, context-sensitive input, and dynamics that increase productivity and results reliability from the start. The Advanced Graphic option improves large model saving and loading performance. It also displays and animates large results files.
Built-in tools, such as the Trade Study Generator and the built-in Optimisation Utility, offer quick insight into the effects of design changes. An integrated post-processor lets you display real-time results. You can visualize results as they’re generated during the solution sequence.
Autodesk Nastran works with multiple pre- and post-processors, supports multicore deployment, and offers regional and global usage rights for easier distribution.
Linear static is one of the most common types of analyses engineers need. Apply loads and constraints to your parametric part. The finite element analysis (FEA) solver provides results that you can display in a variety of formats showing stress, strain, and deformation.
Steady State Heat Transfer
Measure both linear and nonlinear capabilities. Autodesk Nastran software supports 2D and 3D models using solid, shell, and line element types. Use the heat transfer model for structural analysis. Generate thermal loading from a heat transfer solution automatically, and perform thermal stress analysis directly following a heat transfer run.
Output features measure:
Assembly Modelling with Contact
Model real-world assembly simulation for different kinds of contact interactions including sliding, friction, and welded contact types. Capture the interaction between bonded, welded, in-contact, sliding, or completely detached parts of modeled assemblies. Different contact models let you capture these different interactions.
Take advantage of simple handling of complex ply data. Basing analyses on latest failure indexes, like Puck and LaRC02, means you can get reliable and insightful results. Progressive ply failure analysis can help you determine how a composite structure responds beyond first ply failure. Use 3D solid composite elements to accurately capture transverse shear in composite structures.
Determine the response of a structure through a period of time under the influence of constant or time-dependent loads. Static analysis shows how a structure will ultimately respond to loading. In the event of impulse loading or other time-dependent loads, structures may behave differently than in their end state. Transient response can help you investigate the behavior of a part on its way to this end result.
Determine the structural harmonic response based upon frequency-dependent loads. Recover displacement, velocity, acceleration, stress, and strain. Normal modes analysis gives you great insight into the natural frequencies of the structure, but doesn’t provide accurate displacements or stresses. Frequency response analysis shows you how a structure responds to a given load across a range of excitation frequencies.
Analyse structural behavior in response to imposed random dynamic loads. Examples of conditions you can simulate include road vibration, wave cycles, engine vibration, and wind loads.
Transient Heat Transfer
Determine the temperature distribution and heat flow within an object that has time-dependent thermal conditions. This feature includes everything in the steady-state heat transfer capabilities, but it also allows for time-dependent loadings and boundary conditions.
Determine the durability of structures under repeated loading, including low- and high-cycle fatigue. Loading can be simple or multiaxial. Measure structure durability by the number of cycles to failure or the cumulative damage. Loads that cause damage can come from a variety of sources. Use rain flow calculations to capture and characterise the loading, then report estimated durability of the structure.
Analyse structures that are subjected to initial stress. Model the effect of the initial stress state on a structure’s displacements and stresses.
Linear and Nonlinear Analysis of Buckling
Run linear or Euler buckling analyses on loaded models to determine the critical buckling load. Nonlinear buckling analysis is also available for loadings and models that don’t conform to the requirements of linear buckling. These include eccentricities, nonlinear material behavior, and large deformations that affect the buckling loads.
Nonlinear Static and Transient Response
Analyse structures that exhibit nonlinear behavior. Nonlinear effects can be the result of nonlinear material properties, large deformations, and contact-based changes in the boundary conditions. Most physical phenomena contain some kind of nonlinear effect.
Key capabilities include:
Nonlinear analysis can include static loadings that produce nonlinear effects, as well as transient loadings that can show the evolution of the model through time.
Nonlinear Surface Contact
Nonlinear surface contact capability applies to surfaces defined by both solid and shell elements. Surface contact is ideal for large, thin-shell fabrications such as ship, aircraft, and automotive structures. Simulate part-to-part interactions of interlocking components, including press-fits, using surface contact.
With Autodesk Nastran surface contact capabilities, you can:
Automated Impact Analysis – Drop Test
View realistic and meaningful projectile impacts and virtual drop test simulations. Automated impact analysis (AIA) introduces the power that automated tools can bring to demanding simulation problems. Take a complex, time-consuming simulation task. Then, simplify and automate it. AIA requires a minimum amount of data for the analysis: projectile velocity and acceleration.
AIA determines the time steps, duration, and complex contact interaction between projectile and target. This helps provide a thorough and physically realistic simulation of impact due to the comprehensive treatment of the phenomenon. From an engineering standpoint, this is more useful than a simple imposition of force at a point found in other impact or drop tests; AIA provides insight into dynamic, implicit, nonlinear behavior or real-world impact problems.
Advanced Material Models
Analyse conventional engineering materials and simulate the latest advanced materials, including composites, shape memory, hyper-elastic, visco-elastic, and brittle materials. Models include temperature-dependent materials, nonlinear elasticity and plasticity effects, creep, and thermo-elasticity.
Simulate nonlinear composite material behavior using progressive ply failure and cohesive zone analysis. Gain valuable technical design insights from a thorough analysis.
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If you’re not sure which type of course you need to help drive your business forward, please get in touch via email or call us on 01277 263 244. We’re here to help. Alternatively, take a look at the Scheduled Courses.
Types of Learning
Through the Majenta Solutions Academy, individuals and teams can learn through a number of product-based courses or consultancy-led reviews. All designed to help your business meet its objectives, in a format that benefits you. Choose from;
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