🧭 CAE Compass

Edition #14

How can we simulate the deformation of a car during a collision, accounting for the rapid changes in forces?

Hey Buddy!

Welcome to the special edition of CAE Compass where we will explore Nonlinear Explicit Dynamic Analysis.

Don't worry about the complex terminology, we're going to break it down into straightforward terms.

Let's first begin with Dynamic analysis.

Dynamic analysis involves studying how structures respond over time when subjected to forces, impacts or sudden changes. It helps us comprehend the behavior of objects where inertia effects come into play.

Next, let's introduce the Nonlinear aspect..

In traditional dynamic analyses, we assume materials and structures behave predictably. However, nonlinearity adds an element of variability. What does that mean?

It means that materials may exhibit unexpected flexibility, greater stretch or respond in ways that don't align with traditional expectations.

The Explicit Approach:

In CAE, dynamic analyses can be approached in two ways: implicit and explicit. Let's focus on the explicit approach, characterized by the solver's ability in direct handling of each moment.

Unlike the implicit approach, which assumes smooth transitions, explicit analysis scrutinizes each individual moment, capturing fine details, jumps and deformations.

So now, it's time to address the crucial question – when is Nonlinear Explicit Dynamic Analysis applicable?

This method is particularly useful in scenarios where rapid and sudden changes occur. Applications include analyzing car crashes, drop tests or situations involving swift events.

Take Crash analysis, for example.

👉 We call it dynamic because it deals with moving objects where inertial effects come into play.

👉 Next, we label it as nonlinear because we capture the nonlinearity in material, geometry or contact.

👉 Lastly, we tag it as explicit because we rely on a specialized (explicit) solver to solve it.

I trust you found value in this edition and gained some valuable insights. The precise opposite of Nonlinear Dynamic is Linear Static.

If the concept has slipped your mind, take a moment to review the second edition by clicking the button below.