How about the SpaceX tank struts? These were presumably <i>designed</i> with the <i>aid</i> of a <i>computer</i>, and were not as strong as they were needed to be.<p>The news stories focused on testing, but testing is kind of the emergency fail safe of product construction. The fix involved a redesign, not more testing, so it seems safe to say the initial design was a failure.<p>It is also possible that the requirements were off.