Hourglassing in FEA

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In FEA, the term "hourglassing" refers to a phenomenon that occurs in certain types of elements, particularly in meshed structures. Hourglassing is a form of element distortion that can affect the accuracy of simulation results. It is characterized by an hourglass shape that forms within the finite element during analysis.

Hourglassing can be problematic because it introduces artificial deformations in the simulation, leading to inaccurate results. It is often associated with elements that have reduced integration, which means they use fewer integration points than standard elements.

Several techniques and element formulations have been developed to address or minimize hourglassing effects, such as using specialized hourglass control algorithms, adjusting material properties, or choosing different element types. Engineers and analysts need to be aware of hourglassing issues and take appropriate measures to ensure the reliability of their FEA simulations.

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