A stress concentration factor chart is a graph that shows the relationship between the theoretical stress concentration factor of a particular shape versus its variation in cross section. These charts are used to quickly obtain a theoretical value of stress concentration without complex calculations (such as finite element analyses) or experimental testing.
Stress concentration factor charts are unique for each shape. For a cross-section loaded in tension or compression with a particular stress riser shape, the graph provides a series of curves that can be interpreted to determine the stress concentration factor.
The X-axis of the graph usually consists of a dimensionless shape factor for the stress riser, while the Y-axis displays the theoretical stress concentration factor, Kt. Once the geometric properties of the stress riser shape are known, the graph can be used extrapolate the corresponding Kt value.
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