Using Explicit Simulations to Go Further

Highly non-linear simulations can be difficult to converge using the implicit simulation tools. The implicit route can involve several restarts trying different settings each time. Another methodology is available for these non-linear simulations that is explicit dynamics. Explicit dynamics can be used to simulate anything from quasi-static simulations to hypervelocity impacts.

wire crimping

This wire crimping analysis (shown above) is highly nonlinear with large deflections and complex contact. With explicit this is easier to set up as we can specify global contact. Continue reading

From Subtractive to Additive Manufacturing

David Conover, chief technologist for mechanical products at ANSYS Inc., compares a bracket on his left made with additive manufacturing that is lighter and smaller than an identical bracket made by traditional manufacturing – Courtesy Observer Report

David Conover, chief technologist for mechanical products at ANSYS Inc., compares a bracket on his left made with additive manufacturing that is lighter and smaller than an identical bracket made by traditional manufacturing – Courtesy Observer Report

On October 1st, there were more than 2,346 events planned to celebrate Manufacturing Day 2015 — a celebration of modern manufacturing meant to inspire the next generation of manufacturers. Pittsburgh-based Catalyst Connection hosted an event near the ANSYS HQ and a few of our ANSYS team members had the opportunity to attend 2015 Additive Manufacturing for Small Manufacturers. Together with 125 area manufacturers we had the opportunity to listen and learn from a range of experts and industry leaders such as GE Aviation, America Makes, Alcoa, NASA Glenn Research Center, Carnegie Mellon University, and the University of Pittsburgh. Continue reading

Material Forces for Fracture

Durability and failure investigations of products are of high interest to determine the risk of failure in engineering applications. Traditionally fracture mechanics is based on stress intensity factors and J-Integral. However, they are strictly valid under limited applications (for ex., monotonic loading, elastic materials etc.) The needs for fracture for nonlinear materials is sought by several of our customers. Electronics packaging, solders, tires, composites are typical examples. With this in mind, we introduced a novel approach in ANSYS 15.0, viz., Material force. You will find a clear description of the approach in a whitepaper that is available on our websiteContinue reading

Why ANSYS Structural Mechanics 16.0 Is Sweet !

ANSYS 16.0 has some really sweet features for our structural mechanics users. Check out the video below as we use a HexaKopter model from Molly-Shop.De to showcase some key enhancements. Continue reading

What is Mesh Nonlinear Adaptivity?

Many FEA applications can benefit from the ability to strategically modify a mesh during solution, in order to simulate challenging geometry distortions which otherwise cannot be solved. Unlike manual rezoning, mesh nonlinear adaptivity is completely automatic, requiring no user input during solution.

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Accelerate Mechanical Solutions with Intel® Xeon Phi™

intel xeon phi coprocessorRegarding high performance computing (HPC), there are numerous improvements introduced into ANSYS Mechanical APDL16.0. However, I would like to focus this post on a feature that demonstrates the technological leadership of our company. ANSYS Mechanical APDL 15.0 was the first commercial FEA software product to support the Intel® Xeon Phi™ coprocessor. In ANSYS Mechanical APDL 16.0, we extend support for Xeon Phi hardware to virtually all users. The Xeon Phi coprocessors can now be used on either Linux or Windows, as well as with shared-memory parallel (SMP) and distributed-memory parallel (DMP). Continue reading

How to Apply a Harmonic Base Excitation Natively in ANSYS Mechanical Workbench 16.0

In a previous post, I have presented how to apply a harmonic base excitation in ANSYS Mechanical 15.0 using three different techniques. Among those techniques, we had the great ACT extension that has received a great attention due to its ease of use and practicality.

ANSYS 16.0 offers the capability of applying a harmonic base excitation natively, and without the need for the ACT. Acceleration applied as a base excitation uses the Enforced Motion Method. Continue reading

Efficient Simulation of Fabricated Structures

I recently had the chance to visit a customer building, among other products, special cranes and lifting equipment — typical fabricated structures mostly made of welded plates and tubes. As I walked through their facility, the size of the equipment struck me: very thick metal plates, massive tubes to support heavy loads — I’m not a tall guy but I felt even smaller walking by such huge structures! And, as we discussed the simulation of such models, I realized the FEA models were using what we call “thin” elements, in other words beams and shells — a bit of a paradox. Continue reading

Can You Simulate a Better Peristaltic Pump?

The peristaltic pump has become popular across various applications since being patented in the U.S. more than 120 years ago, and technological advances continue to make it relevant. The pump alternates compression and relaxation in its hoses and tubes, drawing fluid in and out. Our throat and intestines are actually good examples of peristaltic pumps.

I recently studied peristaltic pumps with computer analysis to see if I could improve the design through simulation. Where was the starting point? As a multiphysics program, ANSYS’ software suite provided a complete solution to the simulation of a peristaltic pump and I used software ranging from ANSYS Mechanical and ANSYS Fluent to ANSYS Explicit Dynamics  Each tool has its unique capabilities and solved the problem at hand from different perspectives. Continue reading

Taking Material Modelling to the Next Level – Implementing a user-defined constitutive equation using USERMAT

From a structural reliability point of view, it is very important to understand and accurately characterize the material behavior when designing or analyzing an engineering application.

In this respect, ANSYS Mechanical software provides a vast library of material models that can help users simulate various kinds of behaviors such as elasticity, plasticity, creep and hyperelasticity, just to name a few.

Although these models can be used to investigate the mechanical response of a large number of different materials such as metals, rubbers, biological tissues and special alloys, users may wish to incorporate their own material laws into ANSYS. Continue reading