What’s New with Contact Technology in ANSYS 15.0?

contact technology ansys 15Contact technology is used extensively throughout ANSYS Mechanical and Mechanical APDL to enforce compatible behavior between different portions within a model. With each Release, ANSYS continues to improve the breadth and robustness of our contact technology.  In ANSYS 15.0, we have enhanced contact still further to help users build models more efficiently without compromising on robustness.

Trim Contact, first introduced in ANSYS 14.5, is a great tool for reducing the number of unnecessary contact and target elements in large assemblies. In ANSYS 15.0, we have changed the default to activate trim contact even for application involving large deflection.

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ACT Templates for ANSYS DesignXplorer

Application Customization Templates - ACT

Are you familiar with ANSYS ACT (Application Customization Templates)? ACT allows all sorts of great customization. You could use ACT to encapsulate APDL scripts, add new loads and boundary conditions, create custom results, or even integrate third party tools. For instance, Vanderplaats R&D  just integrated their topology optimization product into ANSYS Mechancial via ACT.

The ACT Toolkit requires a license to develop extensions, but not to use extensions created by others or provided in our ACT library. Continue reading

Team Nemesis Preparations for BAJA SAE India 2014 – Guest Blog

image of Akshay Pandhare

GUEST BLOGGER: Akshay Pandhare is a team captain of Nemesis racing for BAJA SAE India 2014 event. He is in the final year of mechanical engineering at COEP, Pune.

Team Nemesis Racing is a division of COEP Motorsports that has, for the past eight years, participated in the SAE BAJA Competitions held at various national and international levels. We conceptualise, design and build our all-terrain vehicles (ATVs) which undergo rigorous tests and inspections during the competition which include endurance racing. We are the proud winners of BAJA India (Overall) and South Africa (Endurance & cost report) in 2013.

The important aspect we look for in designing all our vehicles is the major stresses and strains the components undergo under the rigorous racing conditions and how to counter them and optimise the design ensuring maximum strength and safety with minimum weight. This is made possible by ANSYS’ unmatched simulation environment and superior physics engine. Continue reading

Terrafugia: Developing a Flying Car – Engineering Challenges and Best Practices

Editor’s note: A special thank you to the Terrafugia Engineering Team for compiling today’s blog post.

From conceptual design to manufacturing, we use simulation tools such as ANSYS® Mechanical™ and ANSYS Composite Prep-Post™ to significantly reduce development time and costs. Our senior engineers, Mark Corriere and Nicholas Tucker, have been leading the analysis and simulation charge on the Terrafugia Transition® and have used this iterative process to increase confidence in the physical structure.

Image of Terrafugia Transition

Terrafugia Transition – example of a frontal load case analysis

This is a highly visible topic that we’ve found a lot of people are interested in learning more about, so we’ve teamed up with ANSYS for a webinar at 1pm ET, this Thursday, March 6th, to discuss the technical challenges and design process of developing the Terrafugia Transition®, the premier flying car. The Transition® addresses the limitations of typical general aviation aircraft by extending the multi-purpose flexibility of its driving capability. Continue reading

Understanding Contact Reaction Probes in ANSYS Mechanical

contact reaction probesThere are three methods available for extracting the reaction forces across a contact region in WB-Mechanical:

  1. Contact(Underlying Element)
  2. Contact (Contact Element)
  3. Target (Underlying Element)

When you choose ‘Contact(Underlying Element)’, the code is selecting the contact elements associated with that region, selecting nodes attached to the selected contact,  and then selecting elements attached to the selected nodes before calculating the reaction.

Below is an equivalent APDL command script, where “cid1″ is a parameterized contact element type number for the region of interest. Continue reading

Bring Smart “Assembly Line” Process to Simulations

An assembly line is a manufacturing process in which parts are added in a sequential manner to create a finished product much faster than with handcrafting-type methods. Can we apply the same principles to simulations?

Many a times, a new product is made by using components from some previous designs along with some new parts. So, when performing engineering simulations on the new design, is there an efficient way to leverage the unchanged components from the previous design?

In today’s distributed workforce, various components of a product may be designed at different locations; some even by external contractors. When analyzing the full product, is there a way to directly use the analysis models from the different groups? Continue reading

Piezoelectricity in ANSYS Mechanical, Say Goodbye to Command Snippets!

piezoelectricPiezoelectricity is the ability of certain crystalline materials to generate an electric charge proportional to a mechanical strain (direct piezoelectricity). Direct piezoelectricity was discovered by Pierre and Jacques Curie in 1880 when they were studying the effect of pressure on natural single crystal structures such as tourmaline, quartz, topaz, and Rochelle salt. Converse piezoelectricity is rather the ability to generate mechanical strain in response to an applied electric charge. Piezoelectric stack actuators are a good example of this converse effect. They are increasingly used in micro-positioning applications due to their precision and responsiveness.

Since ANSYS Workbench has been released, the question of whether piezoelectricity can be modeled in workbench has been very popular. Thanks to ‘command snippets’ that made it possible to use APDL commands to convert a certain part of your model to piezoelectric element (PLANE223, SOLID226, or SOLID227), and assign piezoelectric properties to it. Although this has been a fantastic feature, it was not really pleasant to non-APDL users. Continue reading

Transferring Forces from Fluent to System Coupling

A common question I hear from System Coupling users, particularly when using an operating pressure in ANSYS Fluent other than atmospheric pressure, is “Which pressure is used when transferring forces from Fluent to System Coupling and how do I change it?”.

The simple answer is that the forces passed to System Coupling are based on the gauge (or solved) pressure in Fluent by default. More accurately, the gauge pressure minus the Reference Pressure is used, but the Reference Pressure is zero by default so this is equivalent to the gauge pressure.

Before going further let’s review the Operating Pressure, Reference Pressure and gauge pressure.

The Operating Pressure in Fluent should be set to a typical absolute pressure in the system. Pressures set at boundary conditions are then specified relative to the Operating Pressure. Often the Operating Pressure is set to the absolute pressure at an outlet, and then a relative (gauge) pressure of zero is set at the outlet boundary condition(s). Continue reading