Simulations have been playing an increasingly significant role in developing Computer-Aided Engineering (CAE) models over the last decades. Virtual testing has become standard practice in the design process, with analysts striving to establish robust procedures to validate the final products. ANSYS LS-DYNA has become a leading solution in CAE simulations, proving indispensable for engineers. Simultaneously, the BETA CAE pre-processor ANSA offers a comprehensive solution for model building, load case definition, and generating the deck file for ANSYS LS-DYNA. This ensures full conformity with ANSYS LS-DYNA standards, facilitating easy setup and high-quality results. This presentation demonstrates ANSA's capability to handle all needs of a CAE engineer in a broad spectrum of use cases ranging from ID handling and solver deck file conformity up to high level inspection and editing of a complex crash model.
The Oasys LS-DYNA Environment is a key part of many LS-DYNA workflows, used to ensure quality models and results. The introduction of virtual testing crashworthiness (VTC) protocols is changing how CAE teams create and process LS-DYNA crash models and poses several challenges for CAE workflows. Good correlation is moving from beneficial to mandatory, and we can no longer rely on conservative assumptions. The format and quality of outputs is increasingly important to meet the requirements of regulatory bodies. CAE teams will need to work more with physical test data, and safety teams will need to work more with simulation data – how do we improve collaboration and processing? How can we manage large amounts of data for virtual testing?
The general capabilities of LS-TaSC were designed to solve topology and shape optimization of large nonlinear problems involving dynamic loads and contact conditions applied to solid and shell structures. LS-TaSC can deal with huge models with up to 10 million elements, multiple load cases, and multiple disciplines. Three main categories of structural optimization problems can be addressed by LS-TaSC, including topology optimization, topometry optimization, and shape optimization. Topology optimization uses the relative densities of elements as design variables, minimizes the structural mass or a response, or maintain a target mass fraction at the global level, and maximizes the structural stiffness or the fundamental frequency at the local level. Topometry optimization uses the shell element thicknesses as the design variables, and it has similar setting options in terms of the definition of the objective function. Shape optimization chooses a free shape of the outer surface contour to design and finds the best surface shape that yields a uniform stress on the surface. The von Mises stress field is designed, and the uniform surface stress reduces the occurrences of stress concentration.
Ensuring conformity and high level productivity between ANSA and LS-DYNA during model and load case development