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Stress severity factors are used in design and analysis to account for stress concentrations, variations in material properties and fabrication quality, and other analytical uncertainties. They indicate the severity of stress in areas that are prone to crack development. This appendix discusses stress severity factors associated with fastener holes in attachment joints.

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Stress Severity Factor, Mechanics and Mechanisms of Fracture: An Introduction, By Alan F. Liu, ASM International, 2005, p 391–393,

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