Kt is defined as the ratio of peak stress to nominal stress. The peak stress can be quoted as a stress concentration factor, Kt. The average stress across the bulk of the section is around 31,000 psi. Notice how localized this stress peak stress region is. 2 shows the stress variation for a model with eight elements along each local edge adjacent to the right angle. What stress will be calculated in the FEA, and is it realistic?įig. A typical mesh, using quarter symmetry, is shown in the inset in Fig. It is assumed that the FEA model ignores the fillet radius and represents this as a right angle. This represents a transition between widths of a component. We will use a typical shoulder feature as shown in Fig. In this article, I’m focusing on the last example. abrupt transition between materials and.creating abrupt transitions in local constraints.creating abrupt local transitions in local loading. ![]() The stress distribution and high levels of stress locally can be described as an FEA “artifact.” The most common examples of where this can happen are the following: In some circumstances, the stress levels that we predict from FEA are not physically meaningful. 2: Stress variation across shoulder with eight elements on edge.
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