Explicit dynamic analyses often deal with complex problems that occur in a short period of time with high levels of nonlinearity. So the natural question is: what element type is best for such an analysis? In this video, we discuss the advantages and disadvantages of the different element types available. We start by discussing various concepts such as linear and nonlinear shape functions, full integration, and reduced integration. Then we talk about some undesirable behaviors that certain elements can exhibit under certain circumstances, such as hourglass behavior, shear locking, and volumetric locking. Finally, we discuss ways to fix these behaviors to obtain accurate solutions.

00:00 – Introduction
01:20 – Introduction to hexahedral elements
01:48 – Linear and nonlinear shape functions
03:00 – Integration points and Gaussian integration
04:05 – Reduced integration
05:18 – Hourglass behavior
06:46 – Dissolving hourglass behavior
08:49 – Shear lock
10:25 – Resolve shear blockage
11:25 – Volumetric locking
13:03 – Fix volumetric locks
13:29 – Introduction to tetrahedral elements
14:04 – Disadvantages of tetrahedral elements
15:57 – Summary

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