The focus on the adaptive refinement of one-dimensional problems leaves one significant constraint on finite element models untouched, namely, the requirement that the aspect ratio of the elements must be controlled. If an element is too long and narrow, significant elemental modeling errors are introduced into the model. Elements with acceptable and unacceptable aspect ratios are shown in Fig 2A.1.
Figure 2A.1. Elements with acceptable and unacceptable aspect ratios.
When the aspect ratio of an element is too high, the element will contain modeling errors because it will ...