In the figure, what's the area where fatigue failure originated?

Question

BlackTom AI · Accepted Answer

To approach this question, first identify what the diagram is indicating about fatigue origin points and how the sections are labeled.
Option 1: Section B. The fatigue origin is typically identified at the location where the wear, stress concentration, or crack initiation is most clearly depicted, which in this figure corresponds to the area labeled Section B. The diagram’s cues (such as arrows, shading, or crack-initiation markers) point to B as the starting region for fatigue failure.
Option 2: Section C. If you look for Section C, you would expect to see the initiation markers or concentrated damage there; however, the visual cues in the figure do not place the fatigue origin at C. The features associated with initiation are not aligned with C.
Option 3: Section A. Similarly, Section A would be a candidate if the initiation signs were located at that location, but the plotted indicators (crack initiation markers, deformation patterns, or material response) are not concentrated at A in this diagram.
In summary, the correct interpretation of the fatigue-origin area relies on matching the initiation indicators to the labeled sections. In this figure, those indicators are aligned with Section B, whereas Sections A and C do not show the initiation cues as clearly. Therefore, Section B is identified as the fatigue-origin region based on where initiation markers appear and how the diagram guides interpretation.

BK10A6500 Engineering Mechanics 3 - Blended teaching 6.1.2025-20.4.2025 Quiz 8.1

In the figure, what's the area where fatigue failure originated?

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