Abstract
This paper presents a numerical investigation using the two-parameter fracture mechanics approach for studying threaded fastener geometries. It was found that the constraint arising from the presence of a surface crack in a threaded fastener does influence the stress in the forward sector.
Highlights
This paper presents a numerical investigation using the two-parameter fracture mechanics approach for studying threaded fastener geometries
With the inevitability of surface flaws finding their way into mechanical components of all types by way of (i) damage to the surface, (ii) embrittlement caused by hydrogen and (iii) stress corrosion cracking, it is essential to have a full picture of the overall fracture mode at the time of failure for specific geometries
It was found that the J-integral values of a crack front on a threaded fastener are highly reliant on geometric factors to include both flaw size and orientation [2]
Summary
This paper presents a numerical investigation using the two-parameter fracture mechanics approach for studying threaded fastener geometries. Numerical Results In Reakes, et al [2] the J-integral values for a threaded fastener were examined along various crack fronts and at multiple angular orientations, where the geometry of the crack was modeled as an elliptical crack having varying values of width (2a) and depth (b), (Figure 1). Beyond the value of θ=155 degrees the Small-Scale Yielding [SSY] results no longer represent the stress state, but since this point lies outside of the critical area for crack propagation this deviation is of little current significance to this body of work, though future investigation of this phenomenon could be of interest.
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