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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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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Thomas Forrister February 6, 2019

A doctor sits down and discusses treatment options with a patient that has coronary artery disease. Typically, a stenting procedure is used to increase blood flow to the heart, but there are complications: The arteries around this patient’s heart have an atypical anatomy. Fortunately, there are self-expanding stents, which can provide the desired fit and even adapt to vessel changes over time. Here, we use simulation to examine how such stents expand to the artery diameter.

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Henrik Sönnerlind January 30, 2019

You can perform response spectrum analyses with a study type introduced in version 5.4 of the COMSOL Multiphysics® software. In this blog post, we will give an introduction to how you can analyze a structure subjected to a short transient excitation being described by a response spectrum.

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Brianne Christopher January 22, 2019

The EPFLoop team took the stage at the COMSOL Conference 2018 Lausanne with their hyperloop pod design, setting it down for the crowd to see. Learn about the different ways that the team of students and faculty from the École Polytechnique Fédérale de Lausanne, led by Mario Paolone and including Nicòlo Riva, Zsófia Sajó, and Dr. Lorenzo Benedetti, used multiphysics simulation to land in the top spot for hyperloop design at the 2018 SpaceX competition.

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Brianne Christopher January 21, 2019

In a fluid-structure interaction (FSI) scenario, the fluid can affect the structure, the structure can affect the fluid flow, or both. When modeling a device that relies on FSI, you may want to simulate one of these options, a combination, or all three. The Fluid-Structure Interaction multiphysics coupling in the COMSOL® software makes it easy to implement FSI in your analyses. In this blog post, we study the flow through a ball check valve for different flow directions and pressures.

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Thomas Forrister January 18, 2019

You just got the latest smartphone, game console, or tablet. Eager to use it, you set it down to read the directions — but your child grabs it and starts shaking it around. The good news is that the device probably still works, as the internal electronic components have to be certified to function after experiencing certain shock loads. To analyze the shock response of an electronic part (like a circuit board), engineers can use numerical modeling.

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Prashant Srivastava January 9, 2019

Various machinery, such as engines, pumps, and turbines, employ components that transmit the load between the solid parts that are in relative motion. Common examples are piston rings, cams, gear teeth, and (of course) bearings. Often, these components are lubricated by maintaining an oil film between the two solid parts to minimize the friction and wear. In this blog post, we look at methods for modeling the fluid friction in lubricated joints.

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Kristian Ejlebjærg Jensen January 4, 2019

Engineers are given significant freedom in their pursuit for lightweight structural components in airplanes and space applications, so it makes sense to use methods that can exploit this freedom, making topology optimization a popular choice in the early design phase. This method often requires regularization and special interpolation functions to get meaningful designs, which can be a nuisance to both new and experienced users. To simplify the solution of topology optimization problems, the COMSOL® software contains a density topology feature.

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