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Elements: An Engineering Simulation Blog

Serving the engineering simulation community and ANSYS and Rocky DEM users by sharing news, workshops, seminars, training, webinars, tips & tricks, and more.
May
26

COMBINING SIMULATION AND INNOVATION TO ASSESS AND IMPROVE VENTILATOR PERFORMANCE TO FIGHT COVID-19

With COVID-19 defining the new normal with social distancing, quarantining, and working from home, this is an unfamiliar time for many of us. Since the beginning of this outbreak, ventilators have been a key focus as hospitals and elected officials scramble to replenish supplies. So long as we had enough of the devices, lives would be saved. “It’s all about the ventilators,” Gov. Andrew Cuomo of New York said in a March 18 press briefing, adding that the state could need up to 37,000 ventilators at the peak of the outbreak, compared to the existing supply of 3,000.

To contribute to the fight against COVID-19, SimuTech Group has collaborated with Rice University and MIT to help accelerate the efforts in improving ventilator performance.

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Jul
31

Stress Linearization in ANSYS Workbench compatible with ASME BPVC

Stress Linearization in ANSYS Workbench compatible with ASME BPVCStress linearization is a technique used to decompose a through-thickness elastic stress field into equivalent membrane, bending, and peak stresses for comparison with appropriate allowable limits.

  • Membrane stress is the average stress through the thickness (P/A)
  • Bending stress is the linearly varying stress through the thickness (Mc/I)
  • Peak stress is the total stress minus the membrane plus bending stress

Stress linearization was developed in the pressure vessel industry by Kroenke and Gordon in the 1970s. It was first implemented in Section III (nuclear vessels) and Section VIII, Division 2 (commercial vessels) of the ASME Boiler and Pressure Code. Although widely used in industry thereafter, specific guidance was not included in ASME Boiler & Pressure Vessel Code (BPVC) Section VIII Div. 2 until 2007.

While ANSYS Workbench can be used to validate designs, care must be taken in how the stresses and their locations are handled.

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