Evaluating the Necking of an Elastoplastic Metal Bar Benchmark Model

Thomas Forrister March 18, 2019

When performing a tensile test on a specimen with a certain geometry and a ductile material, a phenomenon called necking can occur. At a certain load, the deformation is no longer homogeneous, and a localized “neck” develops. Engineers can use simulation to predict when it will occur. In a benchmark model illustrating the necking of an elastoplastic metal bar, the COMSOL® software is used to solve the numerical model, the results of which have been validated by published research.

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Henrik Sönnerlind March 15, 2019

In a previous blog post, we introduced various physical phenomena that cause damping in structures and showed how such damping can be represented mathematically. Today, we follow up by looking at how to actually include damping in finite element models.

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Henrik Sönnerlind March 14, 2019

If you strike a bowl made of glass or metal, you hear a tone with an intensity that decays with time. In a world without damping, the tone would linger forever. In reality, there are several physical processes through which the kinetic and elastic energy in the bowl dissipate into other energy forms. In this blog post, we will discuss how damping can be represented, and the physical phenomena that cause damping in vibrating structures.

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Brianne Christopher March 12, 2019

What did you want to do with your life at the age of 18? Sir William Henry Perkin was trying to produce a treatment for malaria by synthesizing quinine. Instead, his experiments led him to produce the first synthetic dye of the color we now know as mauve. Let’s learn more about the British chemist responsible for adding more color to our world…

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Fanny Griesmer March 11, 2019

Success in today’s marketplace comes down to both developing reliable products that work as intended and launching them at the right time. Like many other companies out there, Veryst Engineering has found that simulation is an effective tool for looking inside a product and ensuring that the design meets specifications prior to prototyping or manufacturing. For this to work, simulations have to match real-world responses, and understanding material behavior plays a central role. However, not all materials behave predictably.

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Bridget Paulus March 8, 2019

Small, powerful, and efficient, thermal actuators are a good choice for devices such as thermostats and MEMS. This type of actuator heats up via an applied voltage and deforms in such a way that it “actuates” another component. Thermal actuators involve tightly coupled electrical, thermal, and structural phenomena that affect device performance and must be accounted for. Using the COMSOL® software, you can gain insight into these multiphysics interactions and optimize thermal actuator designs.

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Lipeng Liu March 7, 2019

Ships and submarines can be detected by enemy defense systems due to their magnetic signatures. Therefore, numerical analysis of the magnetic signature is of great importance in the design and operation of such vessels. However, the sheet metal used for construction is thin compared to the dimensions of the vessel, which makes the standard finite element approach with volume meshing inefficient. This blog post discusses a way to speed up the computation using a simple submarine example.

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Thomas Forrister March 6, 2019

Nowadays, the need for travel is growing — and with it, transportation alternatives that are greener; less noisy; and, of course, faster. But what moves must eventually stop, and while most planes, trains, and automobiles use mechanical braking, this type of braking can cause damage and become unsafe at high speeds. Not so with eddy current braking. Here, we investigate the potential for this type of frictionless braking and the phenomenon behind this effect.

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Bridget Paulus March 5, 2019

Charge exchange cells can alter the charge of an ion beam, making them useful in fusion reactors, particle accelerators, and semiconductor fabrication equipment. Improving the design of these devices, though, can be time consuming, as many factors (like the input beam’s energy, cell geometry, and neutral number density) affect their performance and must be tested. While these analyses are typically done by simulation experts, they can make the design of such devices accessible to others by building a simulation application…

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Guest F. Xavier Alvarez February 28, 2019

Today, we invite guest blogger F. Xavier Alvarez of Universitat Autònoma de Barcelona (UAB) to discuss modeling heat transfer at the nanoscale using a novel theoretical framework and the COMSOL Multiphysics® software.

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Christopher Boucher February 27, 2019

When analyzing optical designs, it is essential to consider not only light intensity but also polarization. Careful manipulation of light polarization can greatly improve image quality by filtering out light from unwanted sources — for example, to minimize glare. A useful way to learn about light polarization, and how to manipulate it, is through a Fresnel rhomb. With the COMSOL Multiphysics® software, engineers can model the effect of a Fresnel rhomb and similar elements on light polarization in optical systems.

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