Introduction to finite element analysis
Introduction to finite element analysis

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

Introduction to finite element analysis

Step 3 – Boundary conditions

The boundary conditions for the tub are quite straightforward. You may recall that the entire back end of the car - comprising the engine, gear box and so on – is attached solidly to the rear bulkhead of the tub. Other bits and pieces such as electrical wiring, controls, and water pipes we can forget about.

Download this video clip.Video player: Video 8
Skip transcript: Video 8

Transcript: Video 8

Dr. Keith Martin, The Open University
The engine itself forms a structural member. So it’s the front of the engine which bolts firmly to the tub using six threaded fasteners. No rubber anti-vibration mountings on racing cars. The engine, of course, is hugely stiff, almost a solid lump, in fact. Thus, we can say that the chassis tub connects to an infinitely stiff structure at six mounting points.
We say that, under any load condition on the tub, the back end mountings are going nowhere. We assign them a boundary condition restraint of zero displacement in all three directions, x, y, and z. That’s restraining the tub.
The load is applied at the front end as equal and opposite moment arms, a couple in other words, acting through the suspension pick up points. The suspension itself is assumed to be very stiff, no spring resilience for this bit of the exercise. So, the chassis tub experiences a pure torsion due to the applied couple.
End transcript: Video 8
Video 8
Interactive feature not available in single page view (see it in standard view).

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371